MMTM 623 Program Audio Mixer SERIES Output Specifications: Output Level Output Min Load Impedance Nom Max Balanced UnBalanced Left/Right 600 Ohms +4 dBu +21 dBu +19 dBm Balanced Aux 600 Ohms +4 dBu +21 dBu +19 dBm Balanced Connector + Ground + Ground 0 dBu = 0.775 V (rms) 0 dBu = 1 mW Features • six balanced mic/line inputs (transformer optional ) • mic/line inputs assignable per channel to L,R and Aux buses • channel one mute capability, variable threshold • two selectable RCA stereo or mono line inputs • three electronically balanced line outputs: Master L, R and Aux • four-band EQ on Master L, R out • remote Master level control • euro style I/O connectors • 48 VDC phantom power, selectable per channel • remote stereo input select or remote stereo mute Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. 9/5/01 v.1.5 *A4500019* Crest Audio Inc. 16-00 Pollitt Dr. Fair Lawn, NJ 07410 TEL: 201.909.8700 FAX: 201.909.8744 www.crestaudio.com Description The MM 623 is a versatile, high quality mixer designed with the professional in mind. Offering six microphone inputs, two selectable stereo inputs, and such features as bus assignment, phantom power, remote master, Left, Right, and Aux outputs, this compact unit is perfectly suited to modern diverse applications. All inputs and outputs are electronically balanced. Equalization is performed by an active, four-band, fixed frequency stereo EQ. There are three five-segment LED meters monitoring each of the main outputs. Each of the microphone inputs has switchable phantom power and a 20 dB pad for line level signals. Channel one has a variable threshold for ducking all other inputs. The unit offers remote select of the two stereo inputs. The unit can also be set as master or slave and all audio and control buses are linkable. All connections are offered on pluggable Euro connectors. The MM 623 offers a multitude of features in one EIA rack space. Specifications Test Conditions: MMTM 623 Program Audio Mixer Specifications MMTM 623 Program Audio Mixer 120 Vac 60 Hz maintained throughout testing. gain Input Specifications: Input Microphone without pad Microphone with pad Microphone without pad (optional transformer) Input Impedance (Ohms) 2k 2k 2k Microphone with pad (optional transforme)r 2k Stereo Line 10k Input gainpot setting Max gain +60 dB Min gain +10 dB Max gain +40 dBu Min gain -10 dB Max gain +60 dB Min gain +20 dB Max gain +40 dB Min gain 0 dB Input Level, dBu Min.* Nom.** Max. -76 dBu -56 dBu -39 dBu -25 dBu -4 dBu +13 dBu -56 dBu -36 dBu -19 dBu -5 dBu +16 dBu +33 dBu -74 dBu -54 dBu -37 dBu Balanced/ Unbalanced + Ground Balanced + Ground + Ground Balanced -34 dBu -14 dBu Mic input range without pad (optional transformer): 20 dB to 60 dB Mic input to 0utput without pad (optional transformer): 80 dB max Mic input range with pad (optional transformer): 0 dB to 40 dB Mic input to output with pad (optional transformer): 60dB max Connector Balanced +3 dBu frequency response total harmonic distortion and noise equivalent input noise (EIN) common mode rejection ratio (mic input) crosstalk -54 dBu -34 dBu -17 dBu + Ground Balanced -14 dBu +6 dBu +23 dBu phantom power remote volume control N/A -20 dBV -10 dBV +7 dBV Unbalanced channel mute signal/clip indicators Test Conditions Left/Right 100 dB 84 dB All level controls down Master level control nominal Channel level controls down All controls nominal All channels assigned Mic gain minimum All level controls down Master level control nominal Channel level controls down All controls nominal All channels assigned Mic gain minimum 80 dB Aux 95 dB 92 dB 81 dB <0.1% typical 20 Hz - 20 kHz; Mic to L-R out (22 Hz - 22 kHz BW) -128 dBu Mic input terminated with 150 Ohms >70 dB typical 20 Hz - 20 kHz >70 dB typical adjacent channels (1 kHz) >60 dB typical output to output (1 kHz) +48 Volts at mic + and - inputs 10k Ohm potentiometer 30 dB attenuation 100k Ohm potentiometer 60 dB attenuation >60 dB attenuation Input Channel Status: Green: -20 dBu Red: 2 dB below clipping Output Level Meters: -24: -20 dBu -6: -2 dBu 0: +4 dBu +6: +10 dBu Clip: 2 dB below clipping Noise: Signal/Noise (typical) 20 Hz - 20 kHz+0 dB/-1 dB RCA jacks 0 dBu = 0.775 V (rms) 0 dBu = 1.00 V (rms *Min. input level (sensitivity) is the smallest signal that will produce a nominal output with controls set at maximum gain. **Nominal settings are defined as all controls set at center detent for nominal output. Microphone gain control is as specified. Output MM 623 program audio mixer Mic input range without pad: 10 dB to 60 dB Mic input to output without pad: 80 dB max Mic input range with pad: -10 dB to 40 dB Mic input to output with pad: 60 dB max power requirements dimension (H x W x D) weight Domestic: 120 Vac, 60 Hz 15 Watts nominal Export: 230 Vac, 50/60 Hz 15 Watts nominal 1.75" x 19” x 8.75" (45 mm x 483 mm x 222 mm) 7.4 pounds (3.4 kg) Architects’ & Engineers’ Specifications: The mixer shall have six electronically balanced microphone or line inputs. The mixer shall also have two stereo unbalanced line inputs. All inputs shall be routable to any or all of three master buses, Left, Right and Aux. Each microphone input shall include selectable 48 Volt phantom power. Channel one shall have a variable mute threshold over all other channels. Each input shall have a Signal/Clip indicator that activates green at -20 dB, and turns red at 2 dB below clipping. The mixer shall have three electronically balanced outputs, Left, Right and Aux, each with its own master output control and five LED meter array. The mixer shall have remote master capability for each of the master L,R buses. There shall be remote select for the two stereo inputs, rear panel global 100 Hz low cut filter for the mic inputs, master/slave link mode switch, and audio bus linking. The mixer shall have a shelving low EQ with 15 dB boost or cut starting at 70 Hz, a peak/dip low mid EQ with 15 dB boost or cut at 250 Hz. The unit shall be housed in a rugged metal chassis 1.75” tall by 19” wide by 8.75” deep. One-inch mounting flanges will be provided on each side. The unit shall operate from 120V AC, 60 Hz power. The mixer shall be capable of driving +21 dBu into a balanced load from the Left, Right or Aux outputs, from 20 Hz to 20 kHz. +0 to -2 dB into 600 Ohms with less than 0.1% distortion and with system hum and noise at least 80 dB below rated output.