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owner’s manual X-Rack XRM - rack mount mixers 12 Output Monitor Mixer Important precautions 1 Save the carton and packing materials! Should you ever need to ship the unit, use only the original factory packing. For replacement packaging, call Crest Audio’s Customer Service Department directly. 2 3 Read all documentation before operating your equipment. Retain all documentation for future reference. Follow all instructions printed on unit chassis for proper operation. Service Information Do not open unit! Opening the unit will expose you to potentially dangerous voltages.There are no user serviceable parts inside. Equipment should be serviced by qualified service personnel when: A. The equipment has been exposed to rain. B. The equipment does not appear to oper- ate normally,or exhibits a marked change in performance. C. The equipment has been dropped, or the enclosure damaged. 4 Do not use the unit if the electrical power cord is frayed or broken. The power supply cord should be routed so that it is not likely to be walked on or pinched by items placed upon or against it. 5 Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken so that the means of grounding of a piece of equipment is not defeated. 6 Damage caused by connection to improper AC voltage is not covered by any warranty. 7 Do not spill water or other liquids into or on the unit, or operate the unit while standing in liquid. 8 The power cord of equipment should be unplugged from the outlet when left unused for a long period of time. To obtain service: contact your nearest Crest Audio Service Center, Distributor, Dealer, or Crest Audio at 201.475.4600 USA or visit www.crestaudio.com for additional information. email [email protected] XRM owner’s manual This symbol is used to alert the operator to follow important procedures and precautions detailed in documentation. This symbol is used to warn operators that uninsulated “dangerous voltages” are present within the equipment enclosure that may pose a risk of electrical shock. table of contents Introduction Thank you and congratulations on your purchase of your new Crest Audio X-Rack mixer.We’re confident that you will enjoy many years of trouble-free service from it.You will quickly find that it fits into a wide variety of mixing applications with ease. Due to well thought out sets of features, coupled with intelligent circuit design and the highest standards in construction & workmanship, all Crest Audio console products excel above and beyond the competitor’s products, in every area. This owner’s manual covers the XRM X-Rack mixer.The XRM has 12 Mono inputs and 4 Stereo inputs, adding up to a total of 20 microphone inputs. Each input can feed any of 12 outputs. Please read this manual thoroughly and keep it handy for future reference. If you have any operating concerns that are not covered in this manual, or have application questions of any type, don’t hesitate to contact Crest Audio directly either by phone, fax, or email. Here is our technical support contact information: Phone: (201) 475-4600 Fax: (201) 475-4677 Email: [email protected] Mono Input channels p. 7 Front panel controls and rear panel connections Stereo Input channels p.19 Front panel controls and rear panel connections Master section P .29 Solo and Monitoring System, Output Masters. Front panel controls and rear panel connectors. Specifications P. 41 1 2 3 4 p.4 RIGHT 26dB PAD XRM BLK DIA-REV1.0 - 5/20/02 AC IN 100-240V 50 / 60 Hz 80W X-RACK REAR PANEL: AC INLET & SWITCH POWER ON SOLO-LINK CONNECTORS. USE 5-PIN DIN CABLE FROM SLAVE CONSOLE OUT TO MASTER CONSOLE IN IN FADER P SIG LED G OUT SOLO-LINK: HI MID 400 - 8 KHZ FREQ LEVEL HI MID 400 - 8 KHZ HI MID 400 - 8 KHZ POST FADER L&R RIGHT LEFT PRE EQ PRE FADER PRE EQ PRE FADER HF 12 KHZ HF 12 KHZ LEVEL BICOLOR GROUND COMP BALANCED DRIVER DRIVER LED GC PRE-AMP OUT L&R SOLO TRIGGER FOUR BAND EQ - RIGHT LOW MID 80 - 2 KHZ FOUR BAND EQ - LEFT LOW MID 80 - 2 KHZ PRE FADER L&R LF 80 HZ LF 80 HZ FREQ LEVEL 4 STEREO INPUTS AVAILABLE AMP GAIN INTERNALLY FUSED AND SHORT-CIRCUIT PROTECTED POLY FUSES AUX DC GROUND +12V ANALOG GROUND +48V -17V +17V SHORT-CIRCUIT PROTECTION TO POWER DISTRIBUTION RIBBONS DC OUTPUT BNC CONNECTOR FOR 12VOLT LAMP ( ON FRONT PANEL ) PRE FADER RIGHT FITTED SOLDER LINK BLOB USER OPTIONS PRE-SOURCE BUFFERS LEFT PRE FADER RIGHT +10 +10 LEFT FADER AMPS FET SWITCH SUM POST FADER ELECT SWITCH MIX 1-4 PRE PFL RCA JACK SOLO DC LEV / LEV __ LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV / LEV __ LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING LEV__ / LEV LEV / PAN SWITCHING SOLO DC SOLO RIGHT SOLO LEFT LEV__ / LEV LEV / PAN SWITCHING OBE FRANK LEGENDS XLR JACK LEV__ / LEV LEV / PAN SWITCHING MIX SENDS 11 & 12 MIX SENDS 9 & 10 MIX SENDS 7 & 8 MIX SENDS 5 & 6 MIX SENDS 3 & 4 MIX SENDS 1 & 2 PFL SOLO LEFT SOLO RIGHT LEV / LEV __ LEV / PAN SWITCHING MIX SENDS 11 & 12 MIX SENDS 9 & 10 MIX SENDS 7 & 8 MIX SENDS 5 & 6 MIX SENDS 3 & 4 MIX SENDS 1 & 2 1/4” TRS JACK TO PEAK CIRCUIT MIX 1-4 PRE TO PEAK CIRCUIT STANDARD OUTPUT LEVEL IS +4 dBu AT 0 VU PIN 2 HOT ON ALL BALANCED INPUTS AND OUTPUTS (XLR JACKS) FOR UNBALANCED OPERATION: TIE PIN 3 TO PIN 1, USE PIN 2 FOR OUTPUT, PIN 1 FOR GND “Ø” SYMBOL INDICATES POLARITY REVERSE PANEL SWITCH NO MUTE PRE SOURCE MUTE ? YES CHAN LEVEL PRE FADER PRE-SOURCE BUFFER NO YES +10 FADER AMP MUTE PRE SOURCE MUTE ? CHAN FADER PRE-SOURCE SELECT EQ ON PRE EQ EQ ON PRE-SOURCE SELECT PRE INSERT HF 12 KHZ LEVEL XRM STEREO INPUT MODULE PRE FADER POST FADER SOLO TRIGGER FOUR BAND EQ LOW MID 80 - 2 KHZ LEVEL FREQ LEVEL G CHASSIS GROUND TIES SOLO AUDIO AND CONTROL BETWEEN CONSOLES. SLAVE SOLOS SHOW UP ON MASTER CONSOLE. UNIVERSAL INPUT-VOLTAGE SWITCHING POWER SUPPLY SAFETY GROUND TO CHASSIS INPUT SIGNAL LED PEAK R (PFL) PAD PRE EQ SIG PEAK R (PFL) INPUT SIGNAL LED LF 80 HZ LEVEL FREQ LEVEL 12 MONO INPUTS AVAILABLE XRM MONO INPUT MODULE ALL SWITCHES SHOWN IN THE UP (DESELECTED) POSITION AMP(LIFIER) GAIN SHOWN IN DB WHEN NEEDED WHEN SHOWN: 1/4” TRS SWITCHING JACKS HAVE NORMALLY CLOSED CONTACTS USER OPTIONS IMPLEMENTED WITH REMOVABLE LINKS AND SOLDER BLOBS DEFAULT OPTION POSITION SHOWN UNDERLINED Use 5-Pin DIN cable to interconnect two Consoles SOLO LINK SUM MONO HPF HPF 70Hz -18dB/Oct ROTARY POT INPUT PREAMP GAIN 15 - 60 dB INPUT PREAMP GAIN 10 - 70 dB LINE (MIC PAD) LINE (MIC PAD) LEFT 26dB PAD 26dB PAD XRM BLOCK DIAGRAM REAR PANEL BAL LINE IN SPLIT OUT BAL XLR IN PIN 1 LIFT SPLIT OUT BAL XLR IN +48V ON REAR PANEL INSERT SEND / RTN BAL LINE IN PIN 1 LIFT SPLIT OUT BAL XLR IN +48V ON M12 M11 M10 M9 M8 M7 M6 M5 M4 M3 M2 M1 EVEN MIX BUSES 2 4 6 8 10 12 1 3 5 7 9 11 ODD MIX BUSES SOLO DC SOLO RIGHT SOLO LEFT SOLO CONTROL LOGIC SOLO MIX AMPS SOLO FEED L-R L R COMMON INPUT LEVEL FOLLOW SOLO LED METERS SOLO ON HPF 40Hz -18dB/Oct M12 EVEN MIX AMP SOLO LOGIC & SWITCH LO-CUT ON HPF HPF 40Hz -18dB/Oct HPF SOLO DC SOLO RIGHT SOLO LEFT STEREO PAIR CTRL TO INPUT SENDS STEREO PAIR AFFECTS BOTH ODD & EVEN ODD MIX AMP M11 M10 M9 M8 M7 M6 M5 M4 M3 M2 M1 MAIN RIBBON CABLE 40 WAY +9 6 3 0 -3 6 9 12 15 18 21 24 L SIG/PK LED SIG SIG G G 60MM EVEN FADER PRE FADER 60MM ODD FADER PRE FADER HEADPHONE AMP COMMON INPUT CIRCUITRY MONITOR / HP LEVEL SPEAKER ON SOLO AND MONITOR CIRCUITS PWR ON R SIG/PK LED PEAK R (AFL) PEAK R (AFL) AFL-EVEN AFL-ODD XRM MIX PAIR 1 OF 6 PAIRS SHOWN HEADPHONE JACK +10 +10 POST FADER POST FADER COMMON INPUT - R COMMON INPUT - L MONITOR OUT - R MONITOR OUT - L EVEN MIX BAL OUT MIX INSERT SEND / RTN EVEN MIX BUS IN ODD MIX BAL OUT MIX INSERT SEND / RTN ODD MIX BUS IN XRM block diagram XRM owner’s manual how to use this manual format This manual uses a format that is intended to be easy to read, yet technical for those who need to know all the details. For feature descriptions, this is done by devoting the left side of each page to 1) an overall module picture, 2) a block diagram, and 3) a control closeup.These images all pertain to the features and control descriptions on the right side of the page.The intention is to make the manual easy to read while including all the technical details needed for getting the most out of the X-Rack - a compact, flexible, feature-rich addition to Crest Audio's growing line of audio mixing console products. conventions Control Icons This manual uses symbols to illustrate what the control descriptions are referring to.This makes it possible to avoid redundant wording and makes the control descriptions clear. Switch in the UP, non-activated position Switch in DOWN, activated position Switch that illuminates when in the DOWN position Momentary switch that illuminates when activated LED that is on, indicating that it's associated feature is activated LED Potentiometer T= IN + R= IN – S= GND Standard 1/4" TRS jack (used for line level inputs) T= Send R= Return S= GND 1/4" TRS jack with normal switching (used on inserts) Female XLR input jack Male XLR output jack p.5 1 Mono input channel XRM owner’s manual Module Controls LINE INPUT ( MIC PAD ) 40 GAIN 20 40 GAIN 50 10 20 70 LO CUT 0 – 50 + HF 8 8 15 2K 10 15 5K 600 400 LO CUT 6 8K 0 – 70 3K 1K HM + 8 8 15 500 500 300 0 F 15 500 500 500 500 500 500 500 500 500 500 500 500 HF 500 500 1K 100 2K 0 – LM + 8 8 15 15 0 – + LF 8 8 15 Block diagram 15 EQ ON 1 MIX SENDS +48V ON PRE – 10 20 30 40 S T R • 6 – 0 2 + 3 • 6 10 20 30 40 – 10 20 30 40 • • 6 – 0 6 + 3 20 • • • 6 – 0 10 + 3 • 6 10 – 10 20 BAL LINE IN • 6 MUTE INSERT SEND / RTN 1 CHAN LEVEL – 0 + 5 10 20 30 40 • 10 PK SIG REAR PANEL PFL p.6 PEAK (PFL) SIG 6 – 0 12 + 3 10 IN SIG L 0 11 + 3 S T R • 20 30 40 INPUT PREAMP 26dB PAD 0 9 + 3 S T R 20 30 40 PIN 1 LIFT 6 – 10 20 30 40 SPLIT OUT 6 – 0 8 + 3 20 HPF 70Hz -18dB/Oct HPF 0 7 + 3 S T R • 10 30 40 GAIN 10 - 70 dB 6 – 10 20 30 40 500 0 5 + 3 S T R • 10 30 40 LINE (MIC PAD) 6 – 10 20 30 40 500 0 3 + 3 6 – 0 4 + 3 10 30 40 BAL XLR IN S T R 20 30 40 0 1 + 3 500 Mono Input channel 1 Front panel features Line Input (Mic Pad) With this switch in the UP position, the input preamp circuit is set up to accept a mic-level signal. This signal is brought in via the XLR mic-input connector located on the rear panel.The 1/4" TRS input jack is ignored. When the switch is depressed, a Pad is inserted into the signal path and the input preamp circuit is set up to accept a line-level signal from either the XLR mic-input connector or the 1/4" TRS input jack, both located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch to act as a PAD switch for bringing a very hot microphone signals down to a controllable level, avoiding overload.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted into both the XLR and TRS jacks, this switch acts as an input selector switch between the two jacks. Gain The Input gain control is used to establish proper gain structure in the channel. For best results, use the Solo system to monitor the channel while you set the gain.The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak indicator can be used for adjusting gain. 70 Hz Lo-Cut filter This filter reduces or eliminates unwanted low frequencies without substantially affecting the program material. Quite often, such unwanted low frequencies are included with mic- or line-input signals. For example, stage rumble or wind can be picked up through vocal mics.The cut-off frequency of the filter is 70 Hz and the slope is -18dB per octave.This type of filter is also referred to as a Hi-pass filter (HPF). It allows the hi-frequencies to pass, but stops the lo-frequencies. Lo Cut Switch Lo-Cut filter is bypassed. Lo-Cut filter is on. p.7 1 Mono input channel XRM owner’s manual Module Controls 10 70 LO CUT 40 GAIN 20 50 10 70 0 – + HF 8 + HF 8 0 – LO CUT 8 8 8 15 2K 1K 15 3K 400 60 8K 0 – 15 2K 1K 1 5K 600 HM + 8 15 3K 8 15 600 15 500 500 300 500 500 500 500 500 500 500 500 500 500 500 500 400 8 + LF 8 15 8 15 15 15 EQ ON 500 1 500 300 MIX SENDS 1K PRE – 10 20 30 40 6 – 0 2 + 3 10 • • 6 – 0 4 + 3 10 – • 6 – 0 6 + 3 10 6 – 0 8 + 3 10 • 3 0 9 + 3 S T R • 6 – 0 10 + 3 10 20 • – – 10 20 0 11 + 3 S T R • 6 – 0 12 + 3 • 6 10 20 15 2 CHAN LEVEL – 0 + 5 30 40 10 PK SIG PRE 2 2 3 4 1 MIX SENDS 2 Block diagram XRM MONO INPUT MODULE 12 MONO INPUTS AVAILABLE 2 2 3 4 2 3 4 LEVEL FREQ LEVEL FREQ LEVEL LEVEL HI MID 400 - 8 KHZ HF 12 KHZ 2 M EQ ON LF 80 HZ LOW MID 80 - 2 KHZ PFL FOUR BAND EQ p.8 15 3 3 • 8 EQ ON 1 10 + LF 8 MUTE 20 8 15 0 2 3 3 4 6 8 15 2 3 4 6 – 10 20 30 40 0 7 + 3 S T R • 20 30 40 LM + 8 6 – 20 30 40 2K 0 2 3 • 10 30 40 0 5 + 3 S T R 20 30 40 – 6 10 30 40 100 2 3 • 20 30 40 0 3 + 3 S T R 20 30 40 2 3 4 6 – 10 30 40 30 3 20 30 40 0 1 + 3 S T R • 20 30 40 8 15 0 – HM + 8 8 15 60 LM + 8 1 8K500 0 – 2K 0 – 500 30 1K 100 5K CHAN FADER 8 Mono Input channel 1 Front panel features Equalizer (EQ) Many audio signals coming into the console require some degree of corrective eq in order to be part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and LowMid bands have a bell-shaped response, each band features variable boost/cut and adjustable frequency. high frequency—HF Boost / Cut 15dB boost and cut. Shelving @ 12 kHz high mid—HM Frequency Continuously variable between 400 Hz and 8 kHz. Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low mid—LM Frequency Continuously variable between 100 Hz and 2 kHz. Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low frequency—LF Boost / Cut 15dB boost and cut. Shelving @ 80 Hz. EQ on Equalizer is OFF. The equalizer circuitry is bypassed. Equalizer is ON. This switch is used to activate the EQ section and can be used to make A/B comparisons between "flat" and eq'd signals. p.9 1 Mono input channel Module XRM owner’s manual COMMON INPUT M STR PAIR SOLO LO CUT PWR STR PAIR 1–2 40 GAIN 20 Chan Fader Master Faders LO CUT 30 40 3–4 10 70 500 500 LO CUT 0 – 500 500 500 15 400 8 LF 500 500 500 500 500 500 500 500 500 500 500 500 20 100 2K 0 – 8 4 LM + 15 30 40 + LF 8 15 1 S T R 1 MIX SENDS PRE 10 – • 10 20 30 40 S T R 6 – 0 2 + 3 • 10 • 10 20 30 40 • 10 20 0 3 + 3 S T R 6 – 0 4 + 3 0 5 + 3 S T R 6 – 0 6 + 3 • 0 7 + 3 • 10 20 • 10 S T R 6 – 0 8 + 3 0 9 + 3 20 30 40 • 10 20 30 40 • 10 S T R 6 – 0 10 + 3 0 11 + 3 S T R • 10 20 30 40 Block diagram 2 3 30 40 PFL STR PA R O CUT STR PA R • 6 – 0 12 + 3 6 20 CHAN LEVEL – 0 + 5 10 PK SIG PFL 6 – 0 3 + 3 S T R 6 – 0 4 + 3 2 3 • R C SOLO RIGHT TO PEAK CIRCUIT • 10 4 SOLO DC 20 30 40 6 – 0 5 + 3 S T R 6 – 0 6 + 3 2 3 2 3 • 10 3 MIX SENDS 1 & 2 LEVEL MUTE LEV__ / LEV LEV / PAN SWITCHING 2 EQ ON MIX 1-4 PRE 2 3 HF 12 KHZ CHAN FADER FADER AMP 2 M1 6 M2 30 40 • 10 MIX SENDS 3 & 4 LEV__ / LEV LEV / PAN SWITCHING +10 – 20 M3 20 M4 30 40 • 0 7 + 3 S T R 6 – 0 8 + 3 2 3 2 3 4 6 2 3 4 LEV__ / LEV LEV / PAN SWITCHING PRE SOURCE MUTE ? 2 3 4 PRE EQ 2 NO PRE INSERT PRE-SOURCE SELECT 20 M6 30 40 • 10 LEV__ / LEV LEV / PAN SWITCHING PRE-SOURCE BUFFER M5 MIX SENDS 7 & 8 PRE FADER 3 4 2 10 MIX SENDS 5 & 6 YES 2 M7 20 M8 30 40 MIX SENDS 9 & 10 LEV__ / LEV LEV / PAN SWITCHING M 10 LEV__ / LEV LEV / PAN SWITCHING 20 30 40 MIX SENDS 11 & 12 M 11 M 12 • 10 M9 – 0 9 + 3 S T R 6 – 0 10 + 3 6 – • 20 • 2 3 4 2 3 4 0 11 + 3 S T R 10 30 40 6 – 0 12 + 3 6 MUTE p.10 2 3 2 3 • SOLO LEFT E 2 1 10 2 500 20 O CUT PFL ULE MUTE 30 40 20 PK SIG 30 40 3 4 6 – 20 30 40 2 3 4 6 – • 10 6 – • 10 10 4 AFL 6 – 20 30 40 3 4 3 10 30 40 3 6 – 0 2 + 3 2 3 4 3 10 30 40 0 1 + 3 S T R 20 6 – 20 30 40 PK SIG 500 – 2 3 • 10 30 40 2 • 500 3 20 30 40 1 2 0 1 + 3 20 30 40 OUTPUT MASTERS 15 EQ ON 500 20 15 0 – • 10 30 40 CHAN LE VEL – 0 + 5 10 30 8 8 6 30 40 10 20 30 1K 20 10 15 300 PRE 6 – 0 12 + 3 1 8 15 ON MIX SENDS S T R 5 HM + Chan Sends MUTE 60 8K 0 – • 1 5K 600 0 M 3K 30 40 5 8 15 2K 1K 20 10 + HF 8 • 10 50 500 + 3 20 2 3 4 2 3 4 Mono Input channel 1 Front panel features Mix Send features The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both mono and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo pair- the Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover to stereo operation is controlled by the STR PAIR switches located above the master faders.A LO CUT switch is also present for activating the hi-pass filter (40Hz, -18dB/oct) for each pair of mixes. Mix 1 - 4 PRE MIX Sends 1-4 are Post-Fader MIX Sends 1-4 are Pre-Fader Normally, the signal feeding the Mix Sends is derived after the main Chan Level Pot (Post-Fader). This Chan Level pot controls the level of the chan signal feeding the individual Mix Send pots. Each Mix Send pot is then used to generate a sub-mix of this channel signal.This Post-fader signal is also affected by the Mute switch; if the channel is muted, the Mix Send no longer receives a signal.There are some cases where an independent mix is desired, the operator doesn’t want the Chan Level to affect the signal. On the XRM, Mixes 1 thru 4 can be switched to receive their signal PRE the Chan Level pot (Pre-fader).The default PRE setting for Mixes 1-4 is pre-fader, but it is still post-insert/post-EQ/post Mute. An internal jumper (per channel) can be changed so that the PRE setting becomes either pre-insert or pre-EQ.Another jumper allows this PRE setting to additionally be independent of the channel mute. Mix Sends 1 & 2 Levels for Mixes 1 and 2 are controlled by this pair of knobs. In MONO mode, each knob controls the amount of chan signal that is sent to its corresponding mix bus. In Stereo Mode, the top knob controls the level to both buses and the bottom knob acts as a PAN control between the two buses- full CCW for Odd, full CW for Even. STR PAIR sw in the UP position(located above Master Fader 1) Knob 1: Send level for Mix 1 Knob 2: Send level for Mix 2 STR PAIR sw in the DOWN position Knob 1: Send level for both Mix 1 and Mix 2 Knob 2: Pan control between Mix 1 and Mix 2 This Send arrangement is repeated for the remainder of the Mix Send pairs on the channel. Each pair’s operation is controlled by its own STR PAIR switch located above the corresponding odd-numbered Master Fader. p.11 1 Mono input channel XRM owner’s manual Module • Controls 6 MUTE 40 GAIN 20 50 10 1 70 LO CUT 0 – + HF 8 8 15 2K 1K 15 10 3K 5K 600 400 – 20 8K 0 HM + 8 30 40 8 15 15 500 500 300 500 500 500 500 500 500 500 500 500 500 500 500 2K 0 – • 500 PFL 8 15 15 0 – 500 LM + 8 + LF 8 Block diagram 8 15 15 EQ ON 1 MIX SENDS PRE – 10 20 30 40 S T R • 6 – 0 2 + 3 • 6 10 20 30 40 – 10 20 30 40 • • – 10 6 – 0 6 + 3 • 6 – 10 20 • • 20 HF 2 KHZ CHAN FADER FADER AMP M1 M2 MIX SENDS 3 & 4 LEV__ / LEV LEV / PAN SWITCHING +10 M3 M4 MIX SENDS 5 & 6 YES 0 9 + 3 • PRE EQ 6 – 10 20 LEV__ / LEV LEV / PAN SWITCHING PRE SOURCE MUTE ? 6 – 0 10 + 3 20 0 11 + 3 S NO 6 – 0 12 + 3 • 6 20 LEV__ / LEV LEV / PAN SWITCHING PRE-SOURCE BUFFER MUTE 1 CHAN LEVEL – 0 + 5 10 20 • 10 PK SIG PFL p.12 PRE INSERT PRE-SOURCE SELECT M5 M6 MIX SENDS 7 & 8 PRE FADER T R • 10 30 40 LEV__ / LEV LEV / PAN SWITCHING MIX 1-4 PRE 0 7 + 3 S T R • 10 30 40 EQ ON 6 – 10 30 40 MUTE 6 – 0 8 + 3 10 30 40 SOLO DC S T R 20 30 40 0 5 + 3 • 10 30 40 MAIN RIBBON CABLE 40 WAY MIX SENDS 1 & 2 EVEL S T R 20 30 40 TO PEAK CIRCUIT 6 20 30 40 SOLO LEFT SOLO RIGHT 0 3 + 3 6 – 0 4 + 3 10 30 40 PFL LE S T R 20 30 40 0 1 + 3 M7 M8 MIX SENDS 9 & 10 LEV / LEV __ LEV / PAN SWITCHING M9 M10 MIX SENDS 11 & 12 LEV__ / LEV LEV / PAN SWITCHING 2 3 10 PK SIG 1K 100 CHAN LE VEL – 0 + 5 M11 M12 Mono Input channel 1 Front panel features Channel Level and Control This next set of controls allows the operator to control and monitor the overall level of the channel signal. Mute Sw and LED The Mute switch kills the channel signal and prevents it from feeding any Mix Send pots.The muteelement itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader setting and redefined as either Pre-Insert or Pre-EQ.Additionally, the mute operation of the PRE signal can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by chan option can be done either by the user or by the factory at the time of order. Mute Switch UP, LED OFF Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots. Mute Switch DOWN, LED ON Channel is muted.The Post-Fader signal is prevented from reaching the Mix Send pots.The PRE signal (available for Mix Sends 1-4) is also muted unless the option has been changed to “Ignore Chan Mute”. LED Channel Level Pot This rotary pot controls the level of Post-Fader signal sent to the individual Mix Sends. Mix Sends 5 thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Prefader signal by the use of the PRE button. Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position. PeaK / SIGnal LED This bi-color LED performs three functions: 1) Chan level; 2) Channel overload; 3) PFL status. 1) Varying intensity Green shows the pre-fader signal level 2) Red warns of channel clipping anywhere within the signal path. 3 points are monitored by the Peak circuitry: Input preamp, EQ circuit, and Fader amp. If any of these points come within 3dB of clipping, the LED will illuminate Red. 3) If the Chan PFL button is depressed, the LED will illuminate Red. LED PFL Sw (and LED) The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and outputs are monitored After-Fader (AFL).When a Mono channel is Solo’d, it appears in the Solo meters and headphone/monitor system as a mono signal (equal level to both sides).The Solo’d signal is Pre-fader, so the level feeding the Solo system is not affected by the setting of the Chan Lev pot. Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating that the PFL button is depressed.The Solo system is additive, so any and all channels that have their PFL switches depressed will be mixed together and monitored by the Solo system. p.13 1 Mono input channel XRM owner’s manual Connectors Rear panel +48V On Balanced Line Inputs For Stereo Channels S1–S4 PUSH L L Bal Input S3 L L Bal Input R S1 Bal Input L R S4 S2 S4 L Split Out R +48V On S3 PUSH R XLRs Pin1 Lift L R S4 Split Out S3 PUSH L Input R XLRs Pin1 Lift Bal Input PUSH L Input PUSH R +48V On +48V On S2 L Input PUSH R XLRs Pin1 Lift L R S2 Split Out PUSH +48V On R XLRs Pin1 Lift L R S1 Split Out +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On S1 Input PUSH +48V On Balanced Line In Balanced Line In Balanced Line In 12 11 10 Balanced Input PUSH XLRs Pin1 Lift R Split Out 12 Chan Insert Balanced Input PUSH XLRs Pin1 Lift Split Out 11 Chan Insert Balanced Input Balanced Line In 9 PUSH XLRs Pin1 Lift Split Out 10 Chan Insert Balanced Input Balanced Line In 8 PUSH XLRs Pin1 Lift Chan Insert 7 PUSH 6 Balanced Input XLRs Pin1 Lift Split Out 8 Balanced Line In PUSH XLRs Pin1 Lift Split Out 9 Balanced Input Balanced Line In 7 5 PUSH XLRs Pin1 Lift Split Out Chan Insert Balanced Input Balanced Line In Chan Insert Split Out 6 Chan Insert Balanced Line In Balanced Input 4 PUSH XLRs Pin1 Lift Split Out 5 Chan Insert Balanced Input Balanced Line In 3 PUSH XLRs Pin1 Lift Split Out 4 Chan Insert Balanced Input Balanced Line In 2 PUSH XLRs Pin1 Lift Split Out 3 Chan Insert Balanced Input Balanced Line In 1 PUSH XLRs Pin1 Lift Split Out 2 Chan Insert Balanced Input In PUSH Balanced Line In XLRs Pin1 Lift ced put Split Out 1 1 Balanced Input PUSH Chan Insert Block diagram +48V ON XLRs Pin1 Lift BAL XLR IN LINE (MIC PAD) GAIN 10 - 70 dB HPF 70Hz -18dB/Oct Split Out SPLIT OUT HPF PIN 1 LIFT INPUT PREAMP 26dB PAD BAL LINE IN 1 S PEAK (PFL SIG INSERT SEND / RTN REAR PANEL p.14 Chan Insert Mono Input channel 1 Rear panel features +48 V On +48 volts DC is applied equally (thru current-limiting resistors) to both pins 2 and 3 on the micinput XLR connector.This feature is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power) in order to operate. For dynamic or ribbon mics, phantom voltage is not required and should be switched OFF. NOTE 1: Operating this switch (On or Off) causes large voltage swings to occur at the input of the mic preamp. Care should be taken to insure that the channel is muted or the main faders are pulled down to prevent this POP from getting to someone’s ears. NOTE 2: Pin-1 of the XLR is used as the DC return path for the phantom voltage. If the Pin-1 Lift switch is depressed (see below), this path is broken and the microphone will no longer receive operating power from the XRM. If the Pin-1 Lift switch must be used (to prevent a ground-loop hum or other unpleasant sounds when connecting to another mixer), then phantom power must be derived from a different source; either the other connected mixer (usually FOH) or an external phantom supply. Line Input jack Line-level signals, balanced or unbalanced, may be brought into the input channel through this 1/4” TRS jack.The LINE switch (front panel) must be pressed for this jack to be active. On the XRM, the XLR jack is normal'd to the switching contacts of this jack. If nothing is plugged into the jack, a padded XLR signal is available to the channel when the LINE switch is depressed.This allows the LINE switch to perform a dual function: XLR pad if nothing is plugged into the Line jack, or XLR(Mic)/Line input selection if the jack is being used. Tip is Positive Input, Ring is Negative Input, Sleeve is Chassis Ground Input impedance is 20KΩ balanced. XLR(Mic) Input jack This balanced, latching, female XLR accepts a low-impedance microphone signal, or a line-level signal, depending on the position of the LINE INPUT switch on the front panel. Pin-2 is Positive Input, Pin-3 is Negative Input, Pin-1 is Chassis Ground Input impedance is 4KΩ balanced Pin-1 Lift Switch Pin-1 of both of the XLR jacks is connected to the XRM chassis thru this switch. This Pin-1 connection serves two main functions: 1) A shield connection point that allows any interference signals (picked up by the cable shield) to be effectively shunted to ground, thus avoiding signal degradation. 2) A DC return path for the +48 volt phantom power voltage. Normally, this switch is left in the UP position; Pin-1 is tied to the XRM chassis, and the shielding and phantom power are both maintained.When the XRM is used by itself, there is usually no reason to press this switch.When the XRM is used in conjunction with another mixer, either by using the builtin passive splitter, or when fed from an external splitter, there may be situations where ground differences between mixers can cause a “ground-loop”.This usually manifests itself as a low-freq hum (usually at the AC mains freq), a hi-freq buzz, or a combination of both. In most cases, lifting the ground connection between mixers can clean up this interference. Pin-1 of BOTH XLR jacks is connected to Chassis ground. Pin-1 of BOTH XLR jacks is disconnected from Chassis ground. NOTE 1: The pin-to-pin wiring between the paired XLR connectors is never changed by this switch, it only disconnects the common, Pin-1 of the XLRs from the mixer chassis, never from one another. NOTE 2: Remember- if this switch is depressed, it prevents the XRM phantom power from reaching the attached microphone. Phantom power (if needed) must be supplied from an alternate source. p.15 1 Mono input channel XRM owner’s manual Connectors Rear panel +48V On Balanced Line Inputs For Stereo Channels S1–S4 PUSH L L Bal Input S3 L L Bal Input R S1 Bal Input L R S4 S2 S4 L Split Out R +48V On S3 PUSH R XLRs Pin1 Lift L R S4 Split Out S3 PUSH L Input R XLRs Pin1 Lift Bal Input PUSH L Input PUSH R +48V On +48V On S2 L Input PUSH R XLRs Pin1 Lift L R S2 Split Out PUSH +48V On R XLRs Pin1 Lift L R S1 Split Out +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On S1 Input PUSH +48V On Balanced Line In Balanced Line In Balanced Line In 12 11 10 Balanced Input PUSH XLRs Pin1 Lift R Split Out 12 Chan Insert Balanced Input PUSH XLRs Pin1 Lift Split Out 11 Chan Insert Balanced Input Balanced Line In 9 PUSH XLRs Pin1 Lift Split Out 10 Chan Insert Balanced Input Balanced Line In 8 PUSH XLRs Pin1 Lift Chan Insert 7 PUSH 6 Balanced Input XLRs Pin1 Lift Split Out 8 Balanced Line In PUSH XLRs Pin1 Lift Split Out 9 Balanced Input Balanced Line In 7 5 PUSH XLRs Pin1 Lift Split Out Chan Insert Balanced Input Balanced Line In Chan Insert Split Out 6 Chan Insert Balanced Line In Balanced Input 4 PUSH XLRs Pin1 Lift Split Out 5 Chan Insert Balanced Input Balanced Line In 3 PUSH XLRs Pin1 Lift Split Out 4 Chan Insert Balanced Input Balanced Line In 2 PUSH XLRs Pin1 Lift Split Out 3 Chan Insert Balanced Input Balanced Line In 1 PUSH XLRs Pin1 Lift Split Out 2 Chan Insert Balanced Input In PUSH Balanced Line In XLRs Pin1 Lift ced put Split Out 1 1 Balanced Input PUSH Chan Insert Block diagram +48V ON XLRs Pin1 Lift BAL XLR IN LINE (MIC PAD) GAIN 10 - 70 dB HPF 70Hz -18dB/Oct Split Out SPLIT OUT HPF PIN 1 LIFT INPUT PREAMP 26dB PAD BAL LINE IN 1 S PEAK (PFL SIG INSERT SEND / RTN REAR PANEL p.16 Chan Insert Mono Input channel 1 Rear panel features (continued): Split-Out XLR jack This male XLR jack is wired pin-to-pin to the female XLR input jack. In combination with the female XLR, it forms a passive,Y-Split of the input signal.This split-signal can be used to feed the mic input to another mixer (usually the FOH mixer), or to “mult” the input to another channel on the XRM. NOTE: This pin-to-pin connection between XLR jacks is NOT affected by the Pin-1 lift switch. Chan Insert jack T= Send R= Return This switching 1/4” TRS jack allows an external signal processor to be inserted into the signal path of the channel.The tip carries the SEND signal from the channel, and the ring carries the RETURN signal back to the channel.The insert-send point is located directly after the Lo-Cut filter on the channel, the return comes back into the channel at the top of the EQ section. Tip is Send, Ring is Return, Sleeve is Audio Ground. Send (output) impedance is 50Ω Return (input) impedance is 5KΩ Nominal Operating Level= +4dBu NOTE: To avoid any degradation of the XRM’s channel signal, any processing gear patched into the channel insert should have a low impedance output (<100Ω) and must be capable of cleanly driving a 2KΩ load to +21dBu. S= GND p.17 2 Stereo input channel XRM owner’s manual Controls Module STR LINE IN ( MIC PAD ) 35 GAIN STR LINE IN 20 40 15 ( MIC PAD ) 60 SUM INPUTS 0 – F 3K 5K 400 HM + 8 500 15 500 500 300 100 0 500 F + HF 2K 0 LM + 8 Block diagram 8 15 15 0 – 500 3 1K – 60 SUM INPUTS T 8 15 F 15 60 8K 0 – M 2 40 15 600 500 20 8 15 2K 1K M 35 GAIN N + HF 8 + LF 8 8 15 15 +48V ON XRM STEREO INPUT MOD EQ ON S1 4 STEREO INPUTS AVAILABL MIX SENDS PRE 10 – 20 30 40 S T R • 6 – 0 2 + 3 • 6 10 20 30 40 – 20 30 40 • 10 20 30 40 • 10 20 S T R – S T R 6 – 0 6 + 3 • 6 – • 6 2 500 500 10 – 0 11 + 3 S T R • 6 – 0 12 + 3 • 6 10 20 500 500 500 SPLIT OUT 500 LF 80 HZ LOW MID 80 - 2 KHZ HI MID 400 - 8 KHZ FOUR BAND EQ - LEFT PIN 1 LIFT PRE EQ 2 BAL XLR IN 2 LF 80 HZ RIGHT LOW MID 80 - 2 KHZ HI MID 400 - 8 KHZ FOUR BAND EQ - RIGHT 3 2 INPUT PREAMP 2 3 SPLIT OUT 2 26dB PAD 2 3 2 CHAN LEVEL – 0 + 5 2 3 • 10 PK SIG PFL p.18 PRE-AMP OUT L&R PEAK R (PFL) LEFT SIG 26dB PAD S1 10 SOLO TRIGGER INPUT SIGNAL LED BAL LINE IN 3 20 L 500 2 3 MUTE 30 40 500 3 20 30 40 S T R 6 – 0 10 + 3 10 2 0 9 + 3 • 20 30 40 FREQ LEVEL 3 10 1 0 7 + 3 S T R 20 30 40 3 6 – 6 – 0 8 + 3 20 0 0 5 + 3 • 10 30 40 LEVEL FREQ LEVEL 2 6 20 30 40 SUM MONO 3 • 10 30 40 GAIN 15 - 60 dB 2 3 • 10 30 40 LINE (MIC PAD) BAL XLR IN LEFT 0 3 + 3 6 – 0 4 + 3 20 30 40 2 3 3 10 500 0 1 + 3 REAR PANEL G POST FADER L&R PRE FADER L&R RIGHT Stereo Input channel 2 Front panel features The XRM features four, full-function Stereo Input channels.These inputs are labeled S1 thru S4 and are located directly left of the master section. Each stereo channel features two mic preamps, so mic-level stereo sources can be processed on one common channel. In cases where just a mono source is present, the SUM INPUTS switch allows a mono source (plugged into either left or right input) to feed both sides of the stereo channel, effectively turning the stereo channel into an additional mono channel for the mixer.This SUM INPUTS switch also permits the operator to collapse a stereo signal to mono if necessary. The Stereo channels are very similar, front-panel wise, to the Mono channels. In most cases, the controls will be identical and the descriptions are repeated here.Any Stereo-specific or Stereo-different controls will be identified as such and further described.The rear panel differs in the amount of jacks offered per channel. Because of space limitations, there is no Channel Insert jack available on the Stereo Channels. Str Line In (Mic Pad) With this switch in the UP position, the input preamp circuits are set up to accept mic-level signals. These signals are brought in via the XLR mic-input connectors located on the rear panel. The 1/4" TRS input jacks are ignored. When the switch is depressed, a Pad is inserted into each of the signal paths and the input preamp circuits are capable of accepting line-level signals from either the XLR mic-input connectors or the 1/4" TRS input jacks, located on the rear panel.The XLR signal is normal'd to the 1/4” TRS jack. If nothing is plugged into the TRS jack, the XLR signal is fed to the preamp when the LINE switch is pressed. Since the TRS signal is always padded down by 26dB, this feature allows the LINE switch to act as a PAD switch for bringing a very hot microphone signals down to a controllable level, avoiding overload.When a plug is inserted into a 1/4" TRS input jack, the XLR mic-input signal is disconnected and the signal present on the 1/4” plug is fed to the preamp. If plugs are inserted into both the XLR and TRS jacks, this switch acts as an input selector switch between the two jacks. Gain The Input gain control is used to establish proper gain structure in the channel. For best results, use the Solo system to monitor the channel while you set the gain.The goal is maximum gain without distortion. Both the main LED meters (during Solo) and the channel’s Level/Peak indicator can be used for adjusting gain. SUM INPUTS (Stereo-specific) By summing the inputs, a stereo input channel can be used as a mono input channel. The channel functions as a stereo input; left input signals feed the left side of the Stereo channel, right inputs feed the right side. If signals are applied to both the Left and Right input jacks, they will be summed together as a mono signal and fed to both sides of the Stereo channel.This sum-point is directly after the input preamps. If a signal is applied to just one of the input jacks and this switch is pressed, that lone signal will feed both sides of the channel and it will be treated as a mono signal throughout the mixer. p.19 2 Stereo input channel XRM owner’s manual Controls Module 15 60 STR LINE IN ( MIC PAD ) 35 GAIN 20 SUM INPUTS T 2 40 15 + HF 8 3K 400 60 8K 0 HM + 8 8 15 500 300 100 8 M 8 8 15 500 EQ ON S1 500 500 500 500 500 500 – 20 • 10 20 30 40 • 10 30 40 • 10 20 30 40 • 10 S T R – • 10 20 30 40 • 10 S T R 6 – 0 4 + 3 • 10 20 30 40 • 10 6 – 0 6 + 3 • 10 20 30 40 • 10 20 30 40 S T R 6 0 9 + 3 S T R 6 – 0 10 + 3 0 11 + 3 S T R 6 – 0 12 + 3 • 6 20 LF 20 30 40 • 10 15 8 15 EQ ON S1 2 2 MIX SENDS 30 4 PRE 2 Block diagram 2 FADER 30 4 2 GAIN - 60 dB PO FAD SUM MONO 2 30 4 LEVEL FREQ LEVEL FREQ LEVEL LEVEL HI MID 400 - 8 KHZ HF 12 KHZ MUTE 2 30 4 EQ ON LF 80 HZ LOW MID 80 - 2 KHZ CHAN LEVEL FADER AMPS LEFT FOUR BAND EQ - LEFT +10 2 PRE EQ 30 4 +10 PK SIG LF 80 HZ PFL LOW MID 80 - 2 KHZ HI MID 400 - 8 KHZ HF 12 KHZ RIGHT FOUR BAND EQ - RIGHT PUT EAMP p.20 + LF 2 S1 CHAN LEVEL – 0 + 5 – 15 0 8 2 30 4 MUTE 10 LM + 8 15 2 30 4 6 – 2K 0 8 30 4 • 10 30 40 0 7 + 3 6 – 0 8 + 3 – – 2 30 4 30 4 6 20 30 40 0 5 + 3 S T R – 100 M 2 30 4 6 – 20 30 40 0 3 + 3 1K 2 30 4 30 4 6 20 30 40 0 1 + 3 6 – 0 2 + 3 20 500 300 PRE 10 15 15 MIX SENDS 30 40 HM + 8 15 8 8 500 0 – 60 8K + LF 8 15 5K 8 15 0 3K 400 LM + 15 600 500 2K 0 – 500 30 1K – K 15 500 500 15 2K 1K 1 5K 8 500 8 15 600 – + HF 8 8 8 15 2K 1K – HF SUM INPUTS 0 – 0 60 YES PRE SOURCE MUTE ? 3 Stereo Input channel 2 Front panel features Stereo EQ The Stereo Input channel has two parallel EQ circuits that are controlled by the same set of knobs. It is functionally identical to the Mono Input EQ. Many audio signals coming into the console require some degree of corrective eq in order to be part of a good sounding mix. XRM offers a 4-Band EQ on each channel.The input EQ consists of the bands: High, High-Mid, Low-Mid and Low.The High and Low frequency bands are shelving equalizers, each have a boost/cut control and their frequencies are fixed.The High-Mid and LowMid bands have a bell-shaped response, each band features variable boost/cut and adjustable frequency. high frequency—HF Boost / Cut 15dB boost and cut. Shelving @ 12 kHz high mid—HM Frequency Continuously variable between 400 Hz and 8 kHz. Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low mid—LM Frequency Continuously variable between 100 Hz and 2 kHz. Boost / Cut 15dB boost and cut. Bell curve with a BW of approx 1.5 octaves Low frequency—LF Boost / Cut 15dB boost and cut. Shelving @ 80 Hz. EQ on Equalizer is OFF. The equalizer circuitry is bypassed. Equalizer is ON. This switch is used to activate the EQ section and can be used to make A/B comparisons between "flat" and eq'd signals. p.21 00 500 500 500 500 500 500 500 500 2 Stereo input channel Master Faders HM STR PAIR LO CUT STR PAIR Chan Level ( MIC PAD ) 1–2 30 40 3–4 35 GAIN 2 40 500 0 500 500 500 500 10 15 2K 3K 500 300 100 500 15 S4 1 8 3 15 EQ ON S1 1 PK SIG 2 – 20 • 10 20 • 10 S T R 6 – 0 2 + 3 – • 10 • 10 S T R 6 – 0 4 + 3 S T R • 6 – 0 6 + 3 • 6 10 20 10 – 20 30 40 • 10 20 30 40 • 10 6 – 0 8 + 3 – • 10 20 30 40 • 10 20 30 40 S T R 6 – 0 10 + 3 6 – 0 11 + 3 S • 10 • 6 – 0 12 + 3 6 20 30 40 • 10 O CUT • Block diagram 10 20 PFL 2 UT MODULE 30 40 SOLO LEFT AVAILABLE PRE FADER SOLO RIGHT 2 POST FADER LEVEL MIX 1-4 PRE MUTE LEV__ / LEV LEV / PAN SWITCHING 2 30 4 EQ ON MID 8 KHZ CHAN LEVEL HF 12 KHZ 30 40 MIX SENDS 1 & 2 6 – 0 4 + 3 6 – LEFT LEV__ / LEV LEV / PAN SWITCHING +10 30 4 30 40 M3 MID 8 KHZ HF 12 KHZ MIX SENDS 5 & 6 RIGHT GHT LEV__ / LEV LEV / PAN SWITCHING 30 4 M5 M6 YES 2 30 4 PRE FADER PRE FADER PRE FADER RIGHT 30 40 SUM PRE-SOURCE BUFFERS PRE EQ RIGHT PRE-SOURCE SELECT 20 M 10 30 40 6 – 0 11 + 3 S T R • 6 – 0 12 + 3 • 6 S1 CHAN EVE p.22 3 3 M 11 M 12 3 3 MUTE MIX SENDS 11 & 12 LEV__ / LEV LEV / PAN SWITCHING S T R • 10 LEV__ / LEV LEV / PAN SWITCHING M9 0 9 + 3 6 – 0 10 + 3 20 MIX SENDS 9 & 10 LEFT PRE EQ PFL M8 – • 10 M7 NO LEFT PK SIG LEV__ / LEV LEV / PAN SWITCHING S T R 3 20 MIX SENDS 7 & 8 PRE SOURCE MUTE ? 0 7 + 3 6 10 0 30 40 2 30 4 6 – 20 30 40 2 6 – 0 6 + 3 • 10 M4 +10 2 S T R • 10 MIX SENDS 3 & 4 0 5 + 3 6 – 0 8 + 3 20 M2 FADER AMPS EFT 2 M1 0 3 + 3 S T R 20 SOLO DC 2 • 10 TO PEAK CIRCUIT 30 4 2 • 3 6 – 20 2 S1 CHAN LEVEL – 0 + 5 STR PA R 30 40 MUTE 10 O CUT 30 4 30 4 T R 20 30 40 0 9 + 3 PFL STR PA R S T R 2 30 4 6 20 30 40 10 LEVEL 0 7 + 3 • 10 30 4 30 4 S T R 20 30 40 0 5 + 3 4 3 30 4 6 – 20 30 40 0 3 + 3 10 PK SIG 2 30 4 6 20 20 0 1 + 3 3 30 40 0 1 + 3 6 – 0 2 + 3 20 3 • • 10 AFL 2 PRE 10 30 40 OUTPUT MASTERS S T R MIX SENDS 30 40 10 + LF 8 CHAN LE VEL – 0 + 5 20 15 0 15 30 40 20 30 40 S 8 • 10 30 LM + 8 30 40 30 40 S1 20 – 20 500 2K 0 8 30 40 10 6 10 30 1K 8 30 40 PRE 2 15 500 – LF 8 8 15 – MIX SENDS MUTE HM + 8 500 • 5 60 EQ ON S1 3 8K 0 – S T R 3 1 5K 400 0 LM 15 600 500 8 8 1K 30 40 5 Chan Sends 2 6 – 0 12 + 3 20 K + HF 8 • 10 60 500 SUM INPUTS – 0 + 3 20 LO CUT STR LINE IN 15 500 XRM owner’s manual Module 20 500 Stereo Input channel 2 Mix Send features The XRM is capable of generating 12 mono mixes, 6 stereo mixes, or a combination of both mono and stereo mixes. Each of the six Odd/Even pairs of sends can be configured as a stereo pair- the Odd pot becomes the level control, the Even pot becomes the pan pot.The changeover to stereo operation is controlled by the STR PAIR switches located above the master faders.A LO CUT switch is also present for activating the hi-pass filter (40Hz, -18dB/oct) for each pair of mixes. NOTE: The Stereo Channels differ in how they feed the Mix Sends.With the Mono Channels, there was only one source within the channel, so the feed to any Mix Send pot is always the mono source. Switching to Stereo-Pair operation simply took this mono source and allowed it to be panned across the odd and even buses. In the Stereo Channels, there are two signal sources, the left and right channel signals. Normally, a sum of these two signals is fed to the Mix Send pots; a pre-fader sum is also generated for use with the Mix 1-4 PRE switch.When the corresponding STR PAIR switch is depressed, the operation AND THE SOURCE of the Mix Sends change.The odd pot still becomes the level control for both buses, but the even pot is now a BALance pot.The feed to the buses changes from a summed mono feed to both sides, to a left-to-odd and right-to-even feed.The stereo signal within the channel is maintained as it is fed to the stereo-paired mix buses. If the SUM INPUTS switch is depressed, the stereo signals within the channel effectively become mono and the Mix sends behave the same as on a Mono channel. Mix 1 - 4 PRE MIX Sends 1-4 are Post-Fader MIX Sends 1-4 are Pre-Fader Normally, the signal feeding the Mix Sends is derived after the main Chan Level Pot (Post-Fader).This Chan Level pot controls the level of the chan signal feeding the individual Mix Send pots. Each Mix Send pot is then used to generate a sub-mix of this channel signal.This Post-fader signal is also affected by the Mute switch; if the channel is muted, the Mix Send no longer receives a signal.There are some cases where an independent mix is desired, the operator doesn’t want the Chan Level to affect the signal. On the XRM, Mixes 1 thru 4 can be switched to receive their signal PRE the Chan Level pot (Pre-fader).The default PRE setting for Mixes 1-4 is pre-fader, but it is still post-insert/postEQ/post Mute. An internal jumper (per channel) can be changed so that the PRE setting becomes either pre-insert or pre-EQ.Another jumper allows this PRE setting to additionally be independent of the channel mute. Mix Sends 1 & 2 Levels for Mixes 1 and 2 are controlled by this pair of knobs. In MONO mode, each knob controls the amount of chan signal that is sent to its corresponding mix bus. In Stereo Mode, the top knob controls the level to both buses and the bottom knob acts as a Balance control between the two buses- full CCW for Odd, full CW for Even. STR PAIR sw in the UP position(located above Master Fader 1) Knob 1: Send level for Mix 1 Knob 2: Send level for Mix 2 STR PAIR sw in the DOWN position Knob 1: Send level for both Mix 1 and Mix 2 Knob 2: Balance control between Mix 1 and Mix 2 This Send arrangement is repeated for the remainder of the Mix Send pairs on the channel. Each pair’s operation is controlled by its own STR PAIR switch located above the corresponding odd-numbered Master Fader. p.23 2 Stereo input channel XRM owner’s manual Controls Module • 6 MUTE STR LINE IN ( MIC PAD ) 35 GAIN N S1 20 40 15 60 SUM INPUTS T 0 – F + HF 8 8 15 2K 15 20 3K 1K 5K 600 400 M 10 HM + 8 8 15 500 500 500 PFL LM + 8 8 15 F 500 2K 0 – – Block diagram 15 0 + LF 8 8 15 15 PFL EQ ON S1 XRM STEREO INPUT MODULE MIX SENDS 10 – 20 30 40 30 40 • 6 – 20 S T R 30 40 • 10 4 20 30 40 10 5 30 40 • 10 6 20 30 40 S T R 30 40 • 10 20 30 40 30 40 • • 10 0 20 30 40 30 40 • 20 30 40 0 5 + 3 S T R – LEV / LEV __ LEV / PAN SWITCHING +10 LF 80 HZ LOW MID 80 - 2 KHZ HI MID 400 - 8 KHZ HF 12 KHZ MIX SENDS 5 & 6 RIGHT FOUR BAND EQ - RIGHT LEV__ / LEV LEV / PAN SWITCHING 3 6 0 9 + 3 S T R 3 6 – 0 10 + 3 6 0 11 + 3 S 10 6 CHAN LEVEL – 0 + 5 10 PFL p.24 PEAK R (PFL) PRE FADER PRE FADER M6 LEFT G RIGHT M8 LEV__ / LEV LEV / PAN SWITCHING M10 MIX SENDS 9 & 10 LEFT PRE EQ SIG M7 LEV / LEV __ LEV / PAN SWITCHING NO PRE FADER PRE FADER L&R 6 – 0 12 + 3 PK SIG PRE-AMP OUT L&R 3 3 • M5 MIX SENDS 7 & 8 SOLO TRIGGER INPUT SIGNAL LED POST FADER L&R S1 20 YES PRE SOURCE MUTE ? 3 • M3 M4 0 7 + 3 S T R – M2 MIX SENDS 3 & 4 LEFT 6 – 0 8 + 3 – M1 FADER AMPS +10 3 MUTE 30 40 CHAN LEVEL HF 12 KHZ 6 T R 10 2 HI MID 400 - 8 KHZ FOUR BAND EQ - LEFT 6 – 0 6 + 3 20 S T R LOW MID 80 - 2 KHZ RE EQ 3 • 10 1 LEV / LEV __ LEV / PAN SWITCHING EQ ON LF 80 HZ MIX SENDS 1 & 2 MUTE 6 – 20 S T R LEVEL 3 3 10 9 FREQ LEVEL 0 3 + 3 S T R 20 8 LEVEL FREQ LEVEL MIX 1-4 PRE 3 • 10 7 SOLO DC POST FADER 6 – 0 4 + 3 20 S T R TO PEAK CIRCUIT 3 • SOLO RIGHT 3 3 10 3 S T R 6 – 0 2 + 3 20 PRE FADER 0 1 + 3 • 10 2 SOLO LEFT 4 STEREO INPUTS AVAILABLE PRE S T R 10 3 1K 100 500 • PK SIG 15 300 M 30 40 8K 0 – 6 CHAN LE VEL – 0 + 5 SUM PRE-SOURCE BUFFERS PRE EQ RIGHT PRE-SOURCE SELECT M9 MIX SENDS 11 & 12 LEV__ / LEV LEV / PAN SWITCHING M11 M12 Stereo Input channel 2 Front panel features Channel Level and Control This next set of controls allows the operator to control and monitor the overall level of the channel signal. Both sides of the Stereo channel (left & right) are simultaneously controlled. Mute Sw and LED The Mute switch kills the channel signals and prevents it from feeding any Mix Send pots.The muteelement itself is a FET transistor, allowing for timed, ramped on-off control of the channel signal.This avoids any “pops and clicks” when muting a channel. Normally, the Mute will also affect the PRE signals of the channel (see Mix Send details). PRE can be selected for Mix Sends 1 thru 4, and is normally the Pre-fader channel signal.There are internal jumpers that allow the user to change the definition of this PRE signal on a channel by channel basis, or it can be specified at the time of order and reconfigured during the product build at the factory.The PRE signal can be changed from its normal Pre-Fader setting and redefined as either Pre-Insert or Pre-EQ.Additionally, the mute operation of the PRE signal can be changed from its default of “Follow Chan Mute” to “Ignore Chan Mute”.Again, this chan by chan option can be done either by the user or by the factory at the time of order. Mute Switch UP, LED OFF Channel is un-muted. Signal is allowed to pass (pre or post fader)to the Mix Send pots. Mute Switch DOWN, LED ON Channel is muted.The Post-Fader signals are prevented from reaching the Mix Send pots.The PRE signals (available for Mix Sends 1-4) are also muted unless the option has been changed to “Ignore Chan Mute”. Channel Level Pot This rotary pot controls the level of the Post-Fader signals sent to the individual Mix Sends. Mix Sends 5 thru 12 always receive this Post-Fader signal. Mix Sends 1 thru 4 have the option of selecting a Prefader signal by the use of the PRE button. Continuously variable from OFF (full CCW) to +10dB gain (full CW).The panel is marked with the dB level of the channel, 0dB (unity channel gain) is at approx the 2-o’clock position. PeaK / SIGnal LED This bi-color LED performs three functions: 1) Chan level; 2) Channel overload; 3) PFL status. 1) Varying intensity Green shows the L&R summed, pre-fader signal level 2) Red warns of channel clipping anywhere within the signal path. 6 points are monitored by the Peak circuitry: Input preamps, EQ circuits, and Fader amps. If any of these points come within 3dB of clipping, the LED will illuminate Red. 3) If the Chan PFL button is depressed, the LED will illuminate Red. LED PFL Sw (and LED) The XRM is equipped with a Stereo Solo system. Input Channels are monitored Pre-Fader (PFL), and outputs are monitored After-Fader (AFL).When a Stereo channel is Solo’d, it appears in the Solo meters and headphone/monitor system as a stereo signal. If the SUM INPUTS sw is depressed, a mono sum will be fed to the Solo system.The Solo’d signal is Pre-fader, the level feeding the Solo system is not affected by the setting of the Chan Lev pot. Channel Pre-fader signal is sent to the Solo bus and displayed on the Solo meters and can be heard on the Headphone and Monitor outputs.The chan PK/SIG LED will illuminate RED, indicating that the PFL button is depressed.The Solo system is additive, so any and all channels that have their PFL switches depressed will be mixed together and monitored by the Solo system. p.25 2 Stereo input channel XRM owner’s manual Connectors Rear panel +48V On Balanced Line Inputs For Stereo Channels S1–S4 PUSH +48V On S4 PUSH +48V On S3 PUSH +48V On S2 PUSH +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On +48V On S1 Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line In Balanced Line Inputs For Stereo Channels S1–S4 L L Bal Input S3 L L Bal Input R S1 Bal Input L S4 S2 R L R Split Out L Input PUSH XLRs Pin1 Lift Bal Input R L Input PUSH R R XLRs Pin1 Lift L R S4 Split Out L Input PUSH R XLRs Pin1 Lift L R S3 S2 Split Out 12 Input PUSH R XLRs Pin1 Lift L R S1 Split Out Balanced Input PUSH XLRs Pin1 Lift R Split Out 12 Chan Insert 11 Balanced Input PUSH XLRs Pin1 Lift Split Out 11 Chan Insert 10 9 Balanced Input PUSH XLRs Pin1 Lift XLRs Pin1 Lift Split Out 10 Balanced Input 8 PUSH Split Out Chan Insert 9 Chan Insert Balanced Input 7 PUSH XLRs Pin1 Lift Split Out Chan Insert 8 Balanced Input 6 PUSH XLRs Pin1 Lift Split Out 7 Chan Insert Balanced Input 5 PUSH XLRs Pin1 Lift XLRs Pin1 Lift Split Out 6 Balanced Input 4 PUSH Split Out Chan Insert 5 Chan Insert Balanced Input 3 PUSH XLRs Pin1 Lift Split Out 4 Chan Insert Balanced Input 2 PUSH XLRs Pin1 Lift XLRs Pin1 Lift Split Out 3 Balanced Input Chan Insert 1 PUSH Split Out 2 Chan Insert PUSH Balanced Input + S4 PUSH XLRs Pin1 Lift Split Out 1 L L Bal Input Chan Insert L Bal Input R PUSH R L Input R Block diagram +48V ON S3 LINE (MIC PAD) BAL XLR IN SUM MONO SPLIT OUT PIN 1 LIFT RIGHT INPUT PREAMP 26dB PAD BAL LINE IN 26dB PAD REAR PANEL p.26 L S4 SPLIT OUT XLRs Pin1 Lift X Pin GAIN 15 - 60 dB LEFT BAL XLR IN S1 Bal Input L R S2 Bal Input L R S4 Split Out L R S3 Stereo Input channel 2 Rear panel features +48 V On +48 volts DC is applied equally (thru current-limiting resistors) to both pins 2 and 3 on both the L & R mic-input XLR connectors.This feature is used with condenser microphones and active direct boxes that require an external DC voltage (phantom power) in order to operate. For dynamic or ribbon mics, phantom voltage is not required and should be switched OFF. NOTE: See the Mono Channel Rear Panel description for warnings and limitations when operating the phantom power switch. Line Input jack Line-level signals, balanced or unbalanced, may be brought into the input channel through these 1/4” TRS jacks.The LINE switch (front panel) must be pressed for this jack to be active. On the XRM, the XLR jacks are normal'd to the switching contacts of these jacks. If nothing is plugged into the jack, a padded XLR signal is available to the channel when the LINE switch is depressed.This allows the LINE switch to perform a dual function: XLR pad if nothing is plugged into the Line jack, or XLR(Mic)/Line input selection if the jack is being used. Tip is Positive Input, Ring is Negative Input, Sleeve is Chassis Ground Input impedance is 20KΩ balanced. XLR(Mic) Input jack This balanced, latching, female XLR accepts a low-impedance microphone signal, or a line-level signal, depending on the position of the LINE INPUT switch on the front panel. Pin-2 is Positive Input, Pin-3 is Negative Input, Pin-1 is Chassis Ground Input impedance is 4KΩ balanced Pin-1 Lift Switch Pin-1 of all four of the XLR jacks is connected to the XRM chassis thru this switch. This Pin-1 connection serves two main functions: 1) A shield connection point that allows interference signals (picked up by the cable shield) to be effectively shunted to ground, thus avoiding signal degradation. 2) A DC return path for the +48 volt phantom power voltage. Normally, this switch is left in the UP position; Pin-1 is tied to the XRM chassis, and the shielding and phantom power functions are both maintained.When the XRM is used by itself, there is usually no reason to press this switch.When the XRM is used in conjunction with another mixer, either by using the built-in passive splitter, or when fed from an external splitter, there may be situations where ground differences between mixers can cause a “ground-loop”.This usually manifests itself as a lowfreq hum (usually at the AC mains freq), a hi-freq buzz, or a combination of both. In most cases, lifting the ground connection between mixers can clean up this interference. Pin-1 of ALL XLR jacks is connected to Chassis ground. Pin-1 of ALL XLR jacks is disconnected from Chassis ground. NOTE 1: The pin-to-pin wiring between the paired XLR connectors is never changed by this switch, it only disconnects the common, Pin-1 of the XLRs from the mixer chassis, never from one another. NOTE 2: Remember- if this switch is depressed, it prevents the XRM phantom power from reaching the attached microphones. Phantom power (if needed) must be supplied from an alternate source. an alternate source. Split-Out XLR jack This male XLR jack is wired pin-to-pin to its corresponding female XLR input jack. In combination with the female XLR, it forms a passive,Y-Split of the input signal.This split-signal can be used to feed the mic input to another mixer (usually the FOH mixer), or to “mult” the input to another channel on the XRM. NOTE: This pin-to-pin connection between paired XLR jacks is NOT affected by the Pin-1 lift switch. p.27 3 Master section XRM owner’s manual Module Controls 12V N P H O N N E S 12V ) R N P 1 ) H O N N E S LAMP 3 2 1 4 5 6 LEV 7 8 9 0 10 F 9 6 3 0 3 6 9 12 15 18 21 24 SPEAKERS ON 4 5 6 LEV 3 7 2 8 1 9 0 10 COMMON INPUT M STR PAIR L R PWR STR PAIR 1–2 4 5 6 LEV 3 7 2 8 1 9 0 10 LO CUT 3–4 500 F 10 0 5 F 3 2 1 10 20 30 9 6 3 0 3 6 9 12 15 18 21 24 SPEAKERS ON 5 M 1 LAMP SOLO LO CUT R 4 5 6 LEV 7 8 9 0 10 COMMON INPUT STR PA R O CUT L R SOLO PWR STR PA R O CUT OUTPUT MASTERS 1 2 PK SIG 3 4 STR PAIR LO CUT AFL 2 STR PAIR LO CUT Block diagram 3 500 7–8 500 5–6 XR 4 500 SOLO AND MONITOR CIRCUITS 500 500 10 SOLO MIX AMPS 5 0 5 +9 6 3 0 -3 6 9 12 15 18 21 24 LED METERS SOLO LEFT FOLLOW SOLO 5 6 10 SOLO FEED L-R SOLO RIGHT 500 MONITOR OUT - L 20 30 7 SOLO DC SOLO CONTROL LOGIC SOLO ON PWR ON SPEAKER ON OUTPUT MASTERS 5 6 PK SIG 7 8 STR PAIR LO CUT MONITOR OUT - R MONITOR / HP LEVEL AFL 9 STR PAIR LO CUT L HEADPHONE AMP HEADPHONE JACK 0 9–10 11–12 R 10 1 5 COMMON INPUT CIRCUITRY 0 2 ODD MIX BUSES 5 1 3 5 7 9 11 10 20 30 OUTPUT MASTERS 9 10 PK SIG AFL p.28 11 12 2 4 6 8 10 12 EVEN MIX BUSES COMMON INPUT LEVEL COMMON INPUT - L L R COMMON INPUT - R Master section 3 Front panel features The XRM master section contains the controls and indicators for the Solo system, headphone and Monitor system, and Mix Master outputs.This section allows the operator to control the overall operation of the mixer. A BNC lamp connector, supplied with +12 volts, is also located within this section. Each individual sub-system will be described in detail. Solo System The XRM is equipped with a Stereo Solo System. Input channels (Mono or Stereo) are monitored Pre-Fader (PFL), and Outputs are monitored After-Fader (AFL). Even though the Solo System itself is stereo, not all monitored points are stereo sources. In those cases, the source appears in the Solo System as a mono signal and appears equally on both meters and is present on both sides (L & R) of the headphone and Monitor outputs. Mono sources include: A) Mono Input channels 1 thru 12, B) Mix Outputs 1 thru 12 : IF the corresponding STR PAIR switch is NOT depressed. Stereo sources include: A) Stereo Input channels S1 thru S4 (NOTE:The PFL monitoring point is after the SUM INPUTS switch, so a Stereo channel will solo as mono (it really is) if the switch is depressed. B) Mix Output Pairs 1-2 thru 11-12 : IF the corresponding STR PAIR switch IS depressed. Either AFL switch (odd or even) will trigger the Solo system, and both LED indicators will show Red. The Solo System is additive.ANY and ALL sources that have their corresponding solo switches pressed (PFL or AFL) will be mixed together.The resulting mixed signal will be displayed on the meters and heard in the phones and monitor system. Headphone jack (PHONES) This 1/4” TRS jack is intended for use with stereo headphones.Any signals that are present in the Solo System can be monitored here.When nothing is solo’d, the output is off.Although capable of driving low impedance headphones ( 8Ω), best results (maximum output) are obtained with medium impedance phones (30Ω to 75Ω types). Headphone/Monitor Level Control This knob controls the amount of Solo audio fed to the Headphones and also to the rear-panel Monitor Out jacks. If no Solo is active, both outputs are OFF (no signal). In most cases, the operator will use headphones to monitor the signals within the XRM, however, there are certain situations where additional monitoring is needed.A cue wedge may need to be set up, or the solo audio may need to be fed to a remote monitoring location; the Monitor Out jacks are available for this purpose. SPEAKERS ON This switch activates the rear-panel Monitor Out jacks.. Monitor Out jacks are muted (OFF). Solo audio (controlled by the above Level control) can feed the Monitor Out jacks. SOLO Meters (L & R) These 12-segment LED ladders show the audio level of the Solo system.When nothing is being solo’d, the meters are off.The meters have a “VU Type” response, they smooth-out the signal and display an average of the audio level. SOLO (ON) This Red LED will illuminate when any solo switch is depressed. PWR This Green LED illuminates when the XRM is powered on. p.29 3 Master section XRM owner’s manual Block diagram- Common Input Module 12V N P H O N E S R COMMON INPUT CIRCUITRY 1 LAMP 3 2 1 4 5 6 LE V 7 8 9 0 10 SPEAKERS ON 3 2 1 4 5 6 LE V 7 8 9 0 10 COMMON INPUT STR PAIR ODD MIX BUSES L R SOLO PWR LO CUT STR PAIR 1–2 COMMON INPUT - L COMMON INPUT LEVEL 1 3 5 7 9 11 9 6 3 0 3 6 9 12 15 18 21 24 L 2 4 6 8 10 12 R COMMON INPUT - R EVEN MIX BUSES LO CUT 3– 4 500 10 5 0 5 10 20 Block diagram- Mix Outputs 30 1 2 PK SIG XRM MIX PAIR 1 OF 6 PAIRS SHOWN AIN BBON ABLE WAY OUTPUT MASTERS 3 ODD MIX BUS IN 4 HPF 40Hz -18dB/Oct AFL ODD MIX AMP MIX INSERT SEND / RTN HPF STR PAIR LO CUT STR PAIR 5–6 LO CUT PRE FADER AFFECTS BOTH ODD & EVEN STEREO PAIR 7– 8 XR 10 CTRL TO INPUT SENDS 5 STEREO PAIR 0 SOLO LEFT 5 SOLO RIGHT SOLO DC LO-CUT ON AFL-ODD SIG/PK LED ODD FADER POST FADER PEAK R (AFL) SIG G ODD MIX BAL OUT +10 60MM SOLO LOGIC & SWITCH EVEN MIX BUS IN 10 20 AFL-EVEN 30 MIX INSERT SEND / RTN EVEN MIX AMP HPF OUTPUT MASTERS 5 6 PK SIG PRE FADER HPF 40Hz -18dB/Oct 7 8 SIG/PK LED AFL EVEN FADER POST FADER PEAK R (AFL) STR PAIR LO CUT STR PAIR LO CUT 0 9 –10 p.30 11–12 SIG G +10 60MM EVEN MIX BAL OUT Master section 3 Front panel features (continued) Common Input Often, a click track, tape playback or ref track, needs to be heard by all the performers.An input channel can be used for this, with all mix sends turned up to the same level. If an input channel is not available, the Common Input section can be used for that purpose. Input jacks, both TRS and XLR, are provided on the rear panel for bringing a line-level, stereo feed into the mixer.This signal is fed to the level pot and then to the Mix buses, left-side signal to odd buses, right-side signal to even buses. Common Input Level This pot controls the amount of Common Input signal fed to the Mix buses. Left input feeds the odd buses, right input feeds the even buses. 12 V Lamp jack A BNC jack is available for attaching a goose-neck lamp.The center connection is 12 Volts DC and the outer connection is ground. A medium or high-intensity 12V DC Littlite can be used.The output voltage is current limited to prevent faulty bulbs or mis-connection from harming the internal workings of the mixer. Mix Master Outputs Each of the 12 Mix Outputs has its own 60mm master fader, AFL switch, and Peak/Sig LED. Additionally, each odd-even pair of outputs has an associated STR PAIR switch and LO CUT switch. Both of these switches affect both of the outputs of the pair:The STR PAIR switch changes the pair of outputs from independent mono to linked-stereo.The LO CUT switch activates the hi-pass filters on both outputs (40Hz, -18dB/Oct) When operating the mixes as separate Mono outputs, each fader sets the overall output level and the associated AFL switch below the fader allows the operator to monitor the output level of the mix. When it is desired to operate in Stereo-Pair Mode, the STR PAIR switch located above the odd-numbered fader is pressed.This sends a control signal to the input channels which reconfigures the associated pair of send pots from Level/Level operation to Level/Pan operation. Additionally, the AFL switches for the pair of outputs are linked and the Solo feed is changed from mono to stereo. Now, if either AFL switch of the pair is pressed, both AFL indicators will illuminate Red and both outputs will appear in the Solo system, odd to left, even to right. STR PAIR switch The pair of outputs associated with this switch are un-linked and operate as independent mono mixes.The AFL switch for the fader will produce a mono feed to the Solo system. The pair of outputs are linked:The associated mix sends on the input channels are changed to Lev/Pan operation, and the AFL switches for the two outputs are linked, producing a stereo Solo feed of the outputs if either AFL is pressed. LO CUT switch Both outputs operate at full bandwidth, low frequencies are not attenuated. Hi-pass filters are inserted into the signal paths of both outputs, reducing low frequency rumble. p.31 3 Master section XRM owner’s manual Controls Module COMMON INPUT H O N N E S M ) R 1 STR PAIR LAMP 3 2 1 4 5 6 LEV 7 8 9 0 10 3 2 1 4 5 6 LEV 7 8 9 0 10 F 500 9 6 3 0 3 6 9 12 15 18 21 24 500 SPEAKERS ON COMMON INPUT M SOLO PWR 12V N P STR PAIR R PWR 1–2 500 500 500 500 LO CUT 3–4 500 10 5 L STR PAIR STR PAIR 1–2 500 SOLO LO CUT LO CUT LO CUT 0 M 3–4 5 500 10 5 F 0 M 10 5 F 10 20 20 30 30 OUTPUT MASTERS 1 2 PK SIG 3 OUTPUT MASTERS 4 AFL 2 1 STR PAIR LO CUT STR PAIR 2 LO CUT 3 4 STR PA R O CUT AFL 3 5–6 PK SIG 7–8 XR 4 10 Block diagram 5 STR PA R O CUT 0 5 5 6 XRM MIX PAIR 1 OF 6 PAIRS SHOWN MAIN BBON ABLE 0 WAY 10 20 HPF 40Hz -18dB/Oct 30 7 ODD MIX BUS IN ODD MIX AMP MIX INSERT SEND / RTN HPF 8 OUTPUT MASTERS 5 6 PK SIG 7 STEREO PAIR AFL 9 STR PAIR LO CUT STR PAIR LO-CUT ON AFL-ODD CTRL TO INPUT SENDS 11–12 SIG/PK LED STEREO PAIR POST FADER SIG G ODD MIX BAL OUT +10 60MM SOLO LEFT 10 1 ODD FADER PEAK R (AFL) LO CUT 0 9–10 PRE FADER AFFECTS BOTH ODD & EVEN 8 5 SOLO RIGHT 0 2 SOLO DC 5 SOLO LOGIC & SWITCH EVEN MIX BUS IN 10 AFL-EVEN 20 30 MIX INSERT SEND / RTN EVEN MIX AMP HPF OUTPUT MASTERS 9 10 PK SIG 11 12 PRE FADER HPF 40Hz -18dB/Oct AFL SIG/PK LED EVEN FADER POST FADER PEAK R (AFL) SIG p.32 G +10 60MM EVEN MIX BAL OUT Master section 3 Front panel features (continued) Master Fader - Mix Output Level 10 5 0 5 10 15 20 30 Each of the twelve mixes has its own 60mm master fader.This fader controls the main output of the mix and allows the operator to easily adjust the level sent to the performers. Up to 10dB additional gain is available.The faders are arranged in odd/even pairs for ease of use when operating in Stereo mode. Nominal setting is at the 0 (unity) point. Peak/Signal LED + AFL Switch & indicator PK/SIG This bi-color LED indicates the pre-fader mix level with varying intensity Green illumination. If critical internal signals get to within 3dB of clipping, the LED will turn Red.This LED will also indicate AFL activation by turning Red. LED AFL This switch allows the engineer to monitor the post-fader level of the mix. Pressing the switch will turn the PK/SIG LED Red and feed the mix to the Solo system where it can be viewed (Solo meters) and monitored (HP and Monitor Out) by the operator. In Mono mode, only the associated mix is fed to the Solo system. It appears as a mono signal in the Solo system (equal level in both left & right). If the associated STR PAIR switch is depressed (located above the odd-numbered faders), then pressing EITHER the odd or even AFL switch will cause BOTH LEDs to illuminate and both mixes will be fed to the Solo system as a stereo pair, odd mix to left, even mix to right. Repeat as necessary: The previous descriptions of the functions associated with each of the Master faders are repeated for the remaining Master faders.The stereo pairing, when activated by a STR PAIR switch, always operates between the associated mixes 1-2, 3-4, 5-6, 7-8, 9-10 and 1112. Not only are the output faders and their controls affected by this switch, the associated mix sends on all the input channels are also affected.The Sends are reconfigured from their normal Lev/Lev operation (odd-pots feed odd buses, even-pots feed even buses) to the Lev/Pan stereo configuration (odd-pots feed BOTH odd and even buses, even-pots pan between the buses). p.33 3 Master section XRM owner’s manual Bus Inputs Mix Inserts and Outputs Mix Insert Bus Input to Mixes 9 5 1 10 6 2 Mix Insert Mix Insert Mix Insert Mix Insert Mix Insert 11 9 7 5 3 1 12 10 8 6 4 2 Mix Out Mix Out Mix Out Mix Out Mix Out Mix Out 11 7 3 11 9 7 5 3 1 12 8 4 12 10 8 6 4 2 Block diagram XRM MIX PAIR 1 OF 6 PAIRS SHOWN MAIN RIBBON CABLE 40 WAY ODD MIX BUS IN HPF 40Hz -18dB/Oct ODD MIX AMP MIX INSERT SEND / RTN HPF PRE FADER AFFECTS BOTH ODD & EVEN STEREO PAIR LO-CUT ON AFL-ODD SIG/PK LED ODD FADER POST FADER PEAK R (AFL) CTRL TO INPUT SENDS STEREO PAIR SIG G ODD MIX BAL OUT +10 60MM SOLO LEFT SOLO RIGHT SOLO DC SOLO LOGIC & SWITCH EVEN MIX BUS IN AFL-EVEN MIX INSERT SEND / RTN EVEN MIX AMP HPF PRE FADER HPF 40Hz -18dB/Oct SIG/PK LED EVEN FADER POST FADER PEAK R (AFL) SIG p.34 G +10 60MM EVEN MIX BAL OUT Master section 3 Rear panel features Main Outputs 1 thru 12 The XRM has 12 Mix outputs. Each output features the following connectors: Bus Input Mix Insert Main Out Bus Input Each of the 12 mixes has an associated Bus Input jack.This female XLR allows external signals to be mixed into the XRM, either from another X-Rack mixer, or any other audio source. Electronically balanced input: 20KΩ impedance Pin-2 Hot, Pin-3 Cold, Pin-1 Chassis Nominal input level is +4dBu Mix Insert T= Send R= Return This switching 1/4” TRS jack allows an external processor to be inserted into the signal path of the mix bus.The tip carries the SEND signal from the XRM, and the ring carries the RETURN signal back to the XRM.The insert-send point is located directly after the Lo-Cut filter on the output, the return comes back at the top of the master fader. Tip is Send, Ring is Return, Sleeve is Audio Ground. Send (output) impedance is 100Ω unbalanced Return (input) impedance is 5KΩ unbalanced Nominal Operating Level= -2dBu NOTE: To avoid any degradation of the XRM’s output signal, any processing gear patched into the mix insert should have a low impedance output (<100Ω) and must be capable of cleanly driving a 2KΩ load to +21dBu. S= GND Mix Output This male XLR is the main output feed for each of the 12 mixes.The jacks are physically arranged for ease of identification when wiring stereo pairs.The output can be used either balanced or unbalanced. For unbalanced operation, connect Pin-3 to Pin-1 and take the output from Pin-2. Electronic balanced cross-coupled output: 100Ω impedance (50Ω per leg) Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis Nominal output level is +4dBu. p.35 3 Master section XRM owner’s manual Rear panel Common Input to All Mixes ( Level Control on Front Panel ) Left (Odd) Right (Even) Monitor Out Left (Odd) Controlled by SPEAKER-ON Switch Right (Even) Block diagram SOLO AND MONITOR CIRCUITS SOLO MIX AMPS SOLO LEFT FOLLOW SOLO SOLO FEED L-R SOLO RIGHT SOLO DC +9 6 3 0 -3 6 9 12 15 18 21 24 LED METERS MONITOR OUT - L SOLO CONTROL LOGIC SOLO ON PWR ON SPEAKER ON MONITOR OUT - R MONITOR / HP LEVEL L HEADPHONE AMP HEADPHONE JACK R COMMON INPUT CIRCUITRY ODD MIX BUSES 1 3 5 7 9 11 2 4 6 8 10 12 EVEN MIX BUSES p.36 COMMON INPUT LEVEL COMMON INPUT - L L R COMMON INPUT - R Master section 3 Rear panel features (continued) Other Inputs and Outputs Common Input A stereo input is provided for feeding a common signal to all of the 12 mix buses simultaneously. From the stereo source, the left signal will feed all of the odd mixes, the right signal will feed all of the even mixes. Both XLR and 1/4” TRS jacks are provided, the XLR jack is normal'd thru the TRS jack, so if a plug is inserted into the TRS jack, the XLR is disconnected. Electronically balanced input: 20KΩ impedance XLR: Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis XLR is normal'd to TRS jack (see diagram): TRS: Tip= Hot, Ring= Cold, Sleeve= Chassis Nominal input level is +4dBu Monitor Output This output follows the Solo system and is controlled by both the HP/Mntr pot and SPEAKER ON switch on the front panel.The pot controls the audio level of both the front panel PHONES jack, and also these rear panel Monitor Out jacks.The SPEAKER ON switch enables these rear jacks while leaving the PHONES unaffected.These jacks normally would feed the engineer’s monitor system if something more than headphone listening was desired. Both TRS and XLR jacks are provided, they are wired in parallel, and both sets may be used Electronic balanced cross-coupled output: 100Ω impedance (50Ω per leg) XLR: Pin-2= Hot, Pin-3= Cold, Pin-1= Chassis TRS: Tip= Hot, Ring= Cold, Sleeve= Chassis Nominal output level is +4dBu. p.37 3 Master section XRM owner’s manual Solo Link Connectors Tie Mixers together AC Inlet Information and warnings SOLO LINK RACK-MOUNT MIXER Professional Audio Products Designed and Built in the USA IN OUT Crest Audio Inc. Fair Lawn, NJ 07410 USA www.crestaudio.com Use 5-Pin DIN cable to interconnect SOLO Systems of X-Rack Mixers 0 AC IN 100-240V 50 / 60 Hz 80W CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC ÉLECTRIQUE—NE PAS OUVRIR WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE ATTENTION! POUR ÉVITER LE RISQUE D'INCENDIE OU DE CHOC ÉLECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU Á L'HUMIDITÉ MOUNT IN RACK ONLY INSTALLER SUR SUPPORT DE MONTAGE SEULEMENT NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Connector Pinouts, Levels & Impedance C UL ® COMMERCIAL AUDIO SYSTEM 25E9 US LISTED I/O Connections • Operating Levels • Impedance (Ω ) 1 2 3 Bal In (Mic) Bal In (Line) Bus In Common In 1= CHS 2= IN + 3= IN – – 60dBu +4dBu +4dBu +4dBu 4K 20K 20K 20K Passive +4dBu +4dBu 4K 100 100 • XLR Female • 1 2 3 1= CHS 2= OUT + 3= OUT – Split Out Mix Out Monitor Out • XLR Male • T= IN + R= IN – S= CHS Line Input Common In +4dBu +4dBu 20K 20K User Options • 1/4” TRS Input • T= OUT + R= OUT – S= CHS • DEFAULT CHANNEL SETTINGS • Monitor Out +4dBu • Mix Sends Are Post-Fader/Follow Mute • When “PRE” Button Is Pressed, Mix Sends Change To Pre-Fader(Post-EQ) 100 • OPTIONS FITTED (Marked By • 1/4” TRS Output • T= Send R= Rtn S= GND Chan Insert Mix Insert +4dBu -2dBu • 1/4” TRS Insert • XLR Input 1 2 Press For Pin 1 Lift Send= 100 Rtn= 10K X-Rack Chassis Connection 3 3 2 1 Passive Split Out p.38 ON X-RACK When Lift-Switch Is Pressed, Pin1 Of BOTH XLRs Is Disconnected From Mixer Chassis NOTE: Lifting Pin 1 will disable Phantom Power • Pin 1 Lift Operation • X-Rack Preamp ✘) • When “PRE” Button Is Pressed, Mix Sends Change To: PRE - INSERT XRM YES PRE - EQ PRE FOLLOWS MUTE ? NO P O W E R Master section 3 Rear panel features (continued) Solo Link When using multiple X-Rack mixers together, the solo systems can be linked.This Solo Link is compatible with the XR-20 and XR-24 Rack mixers. A 5-pin, shielded DIN cable, wired pin-topin, can be used to link the Solo Audio and control signals between mixers.The “Slave” mixer has its own solo’d signals appear in its own solo system, but these signals are also passed to the “Master” mixer where they also show up in the Master mixer solo system, added to any existing solo’d signals, or triggering the Master solo if nothing else was present.The Master and Slave consoles are designated by the IN-to-OUT relationship between the Solo Link connectors.The Master mixer should have the DIN cable plugged into the IN jack, the other end of the cable should plug into the Slave’s OUT jack. This linking can extend to additional mixers (no practical limit). Just keep plugging additional DIN cables between the added mixers.The daisy-chain continues, the ultimate Master will be the mixer with only one DIN cable plugged into the Link-IN jack. NOTE 1:You should not plug the ends of the link-cable into both Link-IN jacks or both LinkOUT jacks across two mixers. No permanent damage will result, but there may be erratic solo behavior (besides, it’s not a nice thing to do to the XRM). NOTE 2: Even though the DIN connector is the same type as used in MIDI systems, the Link connection is not MIDI and should not be connected to a MIDI device. Audio Linking The XRM is equipped with bus-in jacks on all the main mix buses (see earlier Rear-Panel detail) allowing the user to create a larger console out of multiple XRM, XR-20/24 or combinations of all types. Similar to the Solo-Link description,“Slave” mixers can be fed to “Master” mixers by using standard, shielded XLR cables to tie the Slave balanced outputs to the Master mixer’s bus inputs.The Slave outputs (still controlled by their our master faders) are fed to the Master mixer as a sub-mix. No additional inputs are taken up, the bus inputs allow for easy expansion. AC Input The XRM uses an internal switching power supply which is capable of accepting a wide range of line voltages.This industry-standard IEC connector will mate up with any of the common IEC line cords. The incoming voltage can be anywhere between 100 and 240 volts, +/- 10%.The AC mains frequency can be 50 Hz or 60 Hz. Connector Pinout detail The rear panel of the XRM is screened with the pinout and electrical details of the I/O connectors. It is reprinted here for your reference. XRM Internal Options The Input Channels have various options that can be selected. If specified at time of order, the factory will set-up the XRM with the user’s desired settings. If configured from the factory, the appropriate check-box will be marked, showing which option was changed, and what it was changed to. Mix 1-4 PRE: This PRE source is normally Pre-fader. It can be changed to Pre-Insert or Pre-EQ PRE-Follow Mute: Normally, the PRE signal (no matter what the source) will be muted when the main channel is muted (MUTE sw depressed).An option allows the PRE source to ignore the channel mute and be active (ON) at all times. p.39 I/O Connections • Operating Levels • Impedance (Ω ) 1 2 3 Bal In (Mic) Bal In (Line) Bus In Common In 1= CHS 2= IN + 3= IN – –60dBu +4dBu +4dBu +4dBu 4K 20K 20K 20K Passive +4dBu +4dBu 4K 100 100 • XLR Female • 1 2 3 1= CHS 2= OUT + 3= OUT – Split Out Mix Out Monitor Out • XLR Male • T= IN + R= IN – Line Input Common In +4dBu +4dBu 20K 20K S= CHS • 1/4” TRS Input • T= OUT + R= OUT – S= CHS Monitor Out +4dBu 100 • 1/4” TRS Output • T= Send R= Rtn S= GND Chan Insert Mix Insert +4dBu -2dBu • 1/4” TRS Insert • XLR Input 1 2 Press For Pin 1 Lift Send= 100 Rtn= 10K X-Rack Chassis Connection 3 3 2 1 Passive Split Out p.40 When Lift-Switch Is Pressed, Pin1 Of BOTH XLRs Is Disconnected From Mixer Chassis NOTE: Lifting Pin 1 will disable Phantom Power • Pin 1 Lift Operation • X-Rack Preamp Specifications 4 Specifications Frequency response +0/-0.5dB 20Hz-20kHz ref 1kHz (any input to any output) THD+noise any output <0.01% THD 20Hz-20kHz@ +15dBu out Noise mic ein: better than –128dBu 20Hz to 20kHz 150 ohm source, 60dB gain Bus Noise: better than -85dBu Crosstalk/Shutoff All Crosstalk measurements: 20Hz to 20kHz BW Channel Mute >90dB Channel Fader attenuation >90dB Mix Send attenuation >85dB Phase Shift < +/- 30 degrees, 20Hz to 20kHz – mic-in to mix out XLR In F-XLR 4k ohm balanced max voltage gain to mix outs = 92dB M-XLR 4k ohm balanced Passive “Y-Split” of XLR In Split Out Line-in TRS XLR/TRS Com Input Bus inputs Mix outputs >10k >10k >10k XLR Mntr outputs XLR & TRS 100 ohms balanced Headphones Stereo, Intended to drive > eight-ohms Dimensions 17.5" in height (10u) x 19" in width x 4.5" in depth behind panel Weight 30 pounds Internal Power Supply 100 -240 VAC, 50/60 Hz Warranty Five Years Ohms balanced Ohms balanced Ohms balanced 100 ohms balanced p.41 XRM owner’s manual Version 1.01 May 28, 2002 Crest P/N D7000028 Crest Audio 16-00 Pollitt Drive Fair Lawn NJ 07410 (201) 475-4600 www.crestaudio.com
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