CARVIN
 CARVIN
MX621 & MX641
RACK MOUNT MIXERS
MX601 SERIES CONSOLE MANUAL
REVISED 2/16/88
1155 INDUSTRIAL AVE.
ESCONDIDO, CA 92025
TOLL-FREE: (800)854-2235
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TABLE OF CONTENTS
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Unpacking
Inspection
* About the MX621 & MX641 Series Consoles
Read Before Using Your New Mixer!
* Facts About Use
Precautions
Procedures Before Turning On Unit
SE CT ON TO 8-17
*
Front Panel Features
Rear Panel Features
*
SECTION IV 18
LEC HUF
*
SECTION VW ccs sams rar mess pg N 19-21
* Servicing In Your Area
* Factory Servicing
* Warranty Requirements
* Service Authorization Form
SECTION Un a EAN O IO ESMERADA 22-23
* Specifications
Schematic & Technical Information
SECTION |
UNPACKING & INSPECTION
UNPACKING
Carefully remove your new Carvin power amplifier from its carton by turning the unit
upside down (referenced by the lettering on the outside of the box). Pull the staples, remove
any tape securing the box flaps and hold the flaps out. Gently turn the product right side up and
lift the box off of the amp.
INSPECTION
TRUCK FREIGHT SHIPMENTS:
NOTE: INSPECT YOUR AMPLIFIER AND THE SHIPPING CARTON FOR ANY DAMAGE that may
have occurred in shipping. If damage is found, notify the shipping company and Carvin
immediately and obtain a DAMAGE INSPECTION REPORT from the shipping company. BE SURE TO
SAVE ALL PACKING MATERIALS FOR PROOF OF DAMAGE). Send a copy of the damage inspection
report to Carvin and return the goods to Carvin. This will allow us to process any damage claim
with the shipping company and provide you with the fastest return of new goods. All goods must
first be received back at Carvin prior to exchanging or shipping a new item to you. This is both
for yours and our protection.
Also, please note: if you file a "Damage Claim", you will have to settle directly with the
shipping company. Upon receiving your settlement you will then have to re-order a new
replacement.
UPS SHIPMENTS:
If damage is found, and the unit was shipped UPS, first make note of the damage to the unit
and SAVE ALL PACKING MATERIALS. Then, call Carvin and notify UPS of the damage. Have UPS
inspect the damage and issue a damage report number. Then have your unit picked up and
returned to us. Carvin will handle the damage claim with UPS, and upon reciept of your damaged
unit, a new amplifier will be shipped to you immediately.
NOTE: Have UPS issue the damage report because if you file a claim with UPS, you will have
to wait until you receive your settlement before re-ordering from Carvin. This could delay
your receipt of a properly operating unit from 2 to 3 weeks. If you are at all in doubt, call
Carvin and we'll be happy to assist you.
Also, be sure to insure the returned goods for the full amount. This will assure proper
protection against further damage that could result in the return shipment.
Save the carton and all packing materials. In the event you have to re-ship your
amplifiers "ALWAYS" use the original carton and packing materials. This will provide the best
possible protection for your unit during shipment. Both Carvin and the shipping company will
not accept liability for damage caused by improper packing. (Replacement ~artons are available
from Carvin at $10.00 + $2.00 shipping).
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Save your invoice. It will be required for warranty servicing of your unit in the event
such servicing is necessary. Always check your invoice against the items you have received. If
you find some items missing it may be that they were simply split up during shipment. Please
allow several days for the rest of your order to arrive before inquiring. If you determine (after
allowing an appropriate amount of time) that you have not received all your items, please call
Carvin in order that we may take the necessary steps to assure that you receive all the items in
your order.
CAUTION--TO PREVENT ELECTRIC SHOCK, DO NOT DEFEAT THE SAFETY
GROUND CORD.
WARNING--TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE UNIT TO
RAIN, MOISTURE, EXPLOSIVE ATMOSPHERE, OR INSTALL AN IMPROPER FUSE.
Questions? Call our toll-free number (800)854-2235.
SECTION II
ABOUT THE MX601 SERIES RACK MOUNT MIXERS
MODELS: MX621,MX641
The MX601 series mixers are professional rack mountable consoles with built-in power
amplifiers. They are designed to meet the requirements for full function mixing in a rack
package. The MX601 series consoles are currently offered in two models: MX621 and MX641.
The MX621 model delivers 200 watts rms into a two ohm load (150 watts into four ohms)! The
MX641 delivers 400 watts rms into a two ohm load (300 watts into a four ohm load)! PLEASE
NOTE: For simplicity, the manual will refer to both models as the MX641.
The features of the MX641 are well engineered to provide the most flexibility. The quiet
input preamp circuitry and high input headroom coupled with the MX641's responsive power
output make the MX641 consoles a great choice for stage or keyboard amplification. As a mixer
for a small group or band, you will find the compact (and rack mountability) an advantage in
utilizing space while not compromising performance. Additionally, if you ever require more
channels, simply add another MX641 to your rack, and utilizing the patch jacks located on the
front panel, you can have 12 input channels with powered mains and monitors, with separate
graphic EQ's ! The MX641's are designed for the traveling band who want the best possible
performance value in a compact size without a lot of setup hassles.
Carvin is proud of the engineering and design of the MX641 series mixers. This series offers
a noncompromised approach to signal quality and performance. The MX641 features recording
quality XLR balanced microphone inputs. These inputs provide -126dB input signal-to-noise
ratios (over 8dB quieter than comparable mixers). The input summing circuitry will allow for
both the line and mic inputs to be used at the same time. In addition, the 1/4" line inputs will
accept high impedance instrument inputs. The MX641's balanced inputs are phantom powered
allowing the console to also accept condenser mics (the MX621 does not have this feature).
Virtually any type of microphone currently available may be used with the MX641. Each
channel features active high and low band EQ with exceptional summing accuracy and range of
control. Each tone control features over 15dB range of boost and cut. These controls should
accommodate any tonal compensation required to provide the best possible sound. At the top of
each channel is a "monitor" send control allowing for a separate stage monitor mix. Although
the monitor signal is not internally powered, it is designed to drive long cable runs. This will
allow you to remotely power the stage amplifiers dedicated to driving the monitor speakers.
Since the internal power amplifiers are patchable on the MX641 you may elect to use the
mixers’ internal power to drive the monitors, or you elect to separately power your monitors.
If you own two MX641's you can assign the monitor sends to be powered by one console, while
the mains are powered by the other! Each channel also features a separate Effects/Reverb send
control. This will allow you to adjust the desired amount of reverb and effects (digital delay,
chorus, doubling, etc.) desired per channel. Properly using this control can allow you to fine
tune your mix with the desired range of ambience. If you desire special effects, you simply add
them to the patch loop located on the front panel and adjust the intensity of the signal using the
effects return control located on the "RTN TO MAIN" master control section. You will find that
the built-in reverb is "studio quality" and the ability to add ambience to the monitors will be a
great plus in making your monitor mix more accurate and full.
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The channel level and main level controls are reliable rotary potentiometers. They will
allow precise adjustments to establish the appropriate levels for your mix.
The output graphic equalizer incorporates the same circuitry used in our highly praised
EQ2029 1/3 octave equalizer. Its summing accuracy and natural response will allow you to
finely tune your main speakers and achieve the most natural response. This equalizer will
provide a responsive tool for maintaining the linearity of your speaker system while ensuring
the most volume prior to feedback. The graphic equalizer is also "patchable”. This means that it
may be used to equalize the monitors or the mains.
The patch section of the MX641 is both functional and extensive. It will allow you to patch a
tape deck into the unit (without using up any channels). It has auxiliary inputs to allow you to
chain another console to the MX641 without tying up channels. The equalizer can be patched via
the front panel access. The MX641 also features main preamp outputs, monitor preamp outputs
and power amplifier input patching. The accessability of this patch panel as well as its many
patch point further extend the versatility of this mixer.
All Carvin consoles including the MX641 series mixers, are built by using only the finest
components available. All internal electronic circuitry is designed for low noise performance
and high reliability. Extensive shielding and RFI suppression circuitry provide immunity to
radio frequency interference and maintains best signal-to-noise performance. Each channel of
the MX641 features a separate circuit card for modularity and reliability. The channel cards
are connected using highly reliable modular connectors allowing a channel to be easily removed
for servicing or replacement.
The MX641 series mixers are reliable, high quality performance mixers. They are backed
by Carvin's commitment to excellence and experience in both designing and manufacturing
thousands of professional consoles, speaker systems, amplifiers, signal processing and
instruments. The MX641's are engineered to provide you with the best possible design in rack
mountable mixers. They are an excellent example of modern mechanical and electronic design.
Thank you for you support of Carvin and your dedication as a professional musician.
SECTION II
IMPORTANT:
READ THE FOLLOWING BEFORE USING YOUR MIXER
FACTS ABOUT USE
Your new MX641 series mixer is designed to offer many years of trouble free performance.
Understanding the following concepts about the use of your new mixer will help greatly in
maintaining its best performance and reliability.
1.
The wires used for your speakers should be 16AWG or heavier in order to retain the
highest possible damping factor from the amp. All speaker wires should be
NON-SHIELDED. Shielded speaker wires can cause high frequency oscillations that result
in excessive heat build-up and eventual amplifier shut down or failure. See section #3
"Rear Panel Features" (speaker outputs) for additional information outlining the
difference between shielded and non-shielded cables.
The high power output capability of the MX641's amplifier is capable of damaging almost
any loudspeaker. Each speaker should be fuse protected. This will ensure the best
possible protection for your speaker system. If you speakers are not fuse protected, you
may insert a fuse "In-line" (in series with the hot speaker line) of your speaker cord.
Usually the fuse will be in series with the lead going to the "red" terminal of the speaker
(or tip of the 1/4" phone speaker jack). Please remember that fuses are not 100% fail
safe. There are instances where fuses blew and damage was still done to the speaker.
However, fuses do offer protection not otherwise achieved and they have received a good
reputation (overall) for adequate speaker protection.
Periodic cleaning of your unit is strongly recommended. One of the major contributers to
reduced reliabilty is dust and dirt. Keeping your amplifier dusted and free from excessive
build-up of dirt will help provide extended reliability from your mixer.
You will note that the MX641 series mixers do not have a ground reversal switch. It has
been eliminated to prevent shock hazard. All grounding is done through the ground lug of
the three conductor A.C. plug. This is the safe and proper way to ground all electrical
appliances. If for any reason you require an A.C. line phase reversal, you may do so by
utilizing a three to two prong adaptor and flipping the plug. NEVER DEFEAT THE USE
OF THE THIRD PIN GROUND LUG ON THE A.C. RECEPTICLE. WHEN USING A
THREE TO TWO PRONG ADAPTOR, BE SURE THE GROUND LINE IS PROPERLY
CONNECTED TO A 'GOOD' GROUND. THIS IS TO PROVIDE THE BEST MARGIN
OF SAFETY AND PERFORMANCE FROM YOUR AMP.
Always be sure you are plugging the amp into the proper A.C. voltage. Be sure the voltage
is properly regulated. The MX641 features dual voltage capability 120V/220V
switching. If the unit is going to be powered from a generator, be sure the generator has
proper "electronic" voltage regulation and that the A.C. lines are free from voltage surges.
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6. Whenever turning on or off external amplifiers such as monitor amplifiers connected to
your MX641, you should follow this rule: "LAST ON-FIRST OFF" This means that you
will turn on all associated pre-amp (mixers) and associated equipment prior to turning
on the amp. When you are finished with a performance, the amplifier will be the first
item shut down. Following this procedure will help eliminate pops and power surges
(created by preceding equipment) that are annoying to audiences and potentially harmful
to speakers.
7. Do not remove the MX641's cover at any time while the unit is plugged in or turned on.
THERE ARE POTENTIALLY LETHAL VOLTAGES INSIDE THE UNIT.
PRECAUTIONS
Observing the following precautions concerning the use of your MX641 will help extend
its reliability and will help provide for the most dependable operation.
la All connections to the unit should be made with the power off.
2, Do not connect an input ground lead to an output ground lead. This could potentially cause a
ground loop or oscillation.
3. Do not use shielded or "Coax" type cables for speakers. All speaker cords should be
"NON-SHIELDED".
4. Make sure your speakers are properly protected with fuses.
5. Never connect the output of the amplifier to the input of another amplifier. Never connect
the output of the amplifier to any other power source such as a battery, output of another
amp, power main, etc.
6. DO NOT expose the ampiifier to corrosive chemicais such as soft drinks, corrosive
cleaning chemicals, salt water, etc. Never immerse the amplifier in any liquid.
7. NEVER operate the amplifier in an explosive environment, such as closed garage with open
gasoline containers.
PROCEDURES BEFORE TURNING ON THE UNIT
The MX641 mixers are designed for "table top" or "rack mounting”. The four rubber feet
may be removed if amps are to be stacked. Removing the four screws at the bottom of the unit
will allow it to be removed from its cabinet for rack mounting.
When "rack mounting" the MX641, be sure to allow for sufficient air flow. The rack must
have an open back to allow for the normal flow of hot air up and away from the rack.
Make all connections to the unit (input and output) prior to turning on the unit. Be sure all
cords are well maintained. The proper type of cord will ensure the correct input and output
connections to the unit. (All input connections should be shielded cable, and all output
connections should be non-shielded cable, and all output connections should be non-shielded
16AWG gauge wire or greater).
Use your MX641 with common sense and caution. The amplifier in the MX641 is capable of
delivering enough power to damage hearing as well as harm any speaker!
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SECTION III
FRONT PANEL FEATURES
MASTER
INPUT CHANNELS CONTROL SECTION GRAPHIC EQUALIZER
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PATCH SECTION
INPUT CHANNEL
1. XLR MIC INPUT-
This "XLR" input is designed for balanced low impedance (microphone) input signals. This
allows for long microphone cable runs without significant signal or high frequency loss. Low
impedance mics also offer greater signal strength (compared to conventional high impedance
mics) resulting ir. lower overall noise and higher performance from your mixer.
The input channel is "balanced". Since the signal level transmitted by the microphone is very
low, it is susceptible to interferance by "injected signals" from other voltage sources. This
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"hum" can be injected onto the cable by AC lines, stray field from electric motors or other
sources. Balancing the input signal has the result of cancelling this extraneous hum. The net
effect results in the lowest possible noise from long cable runs. The result is low impedance
(allowing for long cable runs) and balanced (long runs witl out hum) will offer the best overall
performance from both your microphones and sound systein.
All microphone cable currently sold are "shielded". This means that the signal wire within
the cord is surrounded by a tightly braided or solid shield "ground" wire. This is done so that
any potential injected signals "stray field" will be passed through a ground plane prior to
reaching the signal wire at the center of the cord. All mic or preamp cables should be shielded
for the best possible performance. See the following diagram for comparison between shielded
and non-shielded cords.
COMPARISON OF SHIELD/NON-SHIELDED CABLES
JACKET WIRE JACKET INSULATION
INSULATION SHIELD WIRE
NON-SHIELDED CORD SHIELDED CORD
2. CHANNEL LINE INPUT JACK-
This jack is designed to accept signals normally too strong for the microphone input
underneath. Line level (or preamp level) signals typically range from 200 millivolts to 2
volts. This input will accept both high and low impedance input signals. It is sensitive enough to
directly accept the output of a guitar or similiar instrument, yet it will also accept line level
signals such as preamp outputs from amplifiers or keyboard systems. It utilizes a standard
1/4" phone plug connection.
3. CHANNEL LEVEL-
The level control adjusts the volume of the channel. It is calibrated from 0 to 10 and will
allow you to set the level of each channel independently from the other channels of the mixer.
The combinations of these various levels and the tonal adjustments will ultimately become your
main level mix. Although each channel's volume can be set with respect to each other, the
overall output level (loudness) of the console is determined by the main level control located on
the master control strip. Typically you want to run these volumes higher than the master
volume. This will provide the best overall signal-to-noise ratio.
4. CHANNEL TONE CONTROLS-
The active tone controls will adjust the overall response of the channel. The high frequency
(treble) control is at the top, and the low frequency (bass) control is at the bottom.
How a tone control works is roughly similar to a volume control. The main difference is that
a tone control adjusts the volume of a specific range. The proper use of these controls will allow
you to properly balance the level of the high frequencies and the low frequencies for the most
natural tone. You should experiment with these controls to become familiar with their
respective sounds and to determine how they will best suit your needs. If you are making
excessive adjustments with these controls it may be due to poor microphone response or
improper micing technique. Changing to a different microphone, or changing the angle (or
proximity of the mic or the sound source) may offer the best solution to the problem.
5. CHANNEL EFF/REV SEND-
The Effects Send Control is a "post volume" control. This means that when the channel volume
is OFF, so is the Effects Send Level. This is done because the control is used to set the level (per
channel) of the signal sent to the internal reverb system or an external effect. Also, the reverb
and/or effect should vary in intensity along with variations in the channel volume. This control
is normalized to the internal reverb system and will control the level of the signal sent to the
internal reverb system.
NOTE: In order to hear reverb from you system you will also have to turn up
the RVB RTN (Reverb Return) control located on the control level master
section of the console. And, you may hear reverb in the monitors as well by
turning up the RVB TO MON control also located on the control level master
section.
6.CHANNEL MONITOR LEVEL-
This is a "prefader" signal that is used to send signals from the channel to the stage monitors.
Any channel volume changes will not affect the response of this control. The MON level control
will select the desired monitor level of a channel relative to the other channels. These levels
will then be "bussed" to the main monitor level control that will establish the overall level of
the stage monitors.
It is possible to have an entirely different stage monitor mix than the main mix. For instance,
you could have a vocal louder in the monitors while feeding a lower volume signal (adjusted by
the channel volume control) to the main speakers. Since stage monitors are typically right next
to the microphones, they are usually the most susceptible to feedback. You should use caution
when adjusting monitor levels during a live performance. It will take a certain amount of "feel"
for addressing the proper monitor mix, however experimentation and practice are the key to
consistent results and professional performances.
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MX641 MASTER CONTROL SECTION
1. MAIN LEVEL CONTROL-
The main level control adjusts the overall volume level of the mix. The "channel" volume
levels will set the relative levels of each channel with respect to each other. The Main Level
Control will then adjust the "overall" level of the entire mix, and ultimately the listening
volume of the system. It is usually best to operate the Main Volume Level control at the same
level as the channel volume controls. This will provide the best signal-to-noise ratio, and
ultimately the quietest mix.
2. PWR LED-
The power LED illuminates to indicate the A.C. power has been applied to the unit.
3. RETURN TO MAIN-
This section of the console allows the control over signals being returned to the main mix.
These three controls adjust the level of the Tape Returns, the Effects Returns, and the Reverb as
it will be heard in the main mix. The following will discuss each of these features:
A The AUX/TAPE return level functions as a seventh channel. This will control
the level of the tape source plugged into the "TAPE IN" jacks. The output level of
most tape decks is preset, which means that without some sort of level control,
the overall level of the tape deck may be too loud. The AUX/TAPE return level
will allow you to adjust the appropriate level that you need for playing tape
signals through the "TAPE IN" feature.
The AUX/TAPE return also adjusts the level of any signal that is returned to the
"AUX IN" (auxiliary input) of your console. This 1/4" phone jack is also
located on the patch section of your console. If you have both a tape deck and
another signal source returned via the "AUX IN", this control will adjust both of
these signals simultaneously.
a
The EFF RTN or "Effects Return Level” wiii adjust the ievei of any effects that
you may have patched into the MX641. Normally you will send signals to your
external effects (such as digital delays, chorus units, doubler, etc.) using the
EFF/RVB send controls on each channel. These signals are then fed to your effect
by patching an appropriate cord from the EFF/SEND jack (at the patch section
of the MX641) to the input of your effect. You will then adjust the appropriate
input sensitivity of your effect its input level control. You should drive your
effect with the optimum signal level to achieve the best performance from your
effect. The output of the effect is then returned to the console via the EFF/RTN
control. You may wish to experiment with various effects to enhance your mix.
Digital delays, and chorusing can really add extra ambience and depth to your
mix for a more full sound. Additionally, the effects send and receive capability
of the MX641 should be exploited to obtain more dimension to your mix.
Experiment with this feature--you will enjoy the variety.
C. RVB/RTN - or Reverb Return Level adjusts the level of the internal reverb
system for your mix. The EFF/RVB send controls simultaneously adjust the
level of the internal reverb system (per channel) along with the effects send
level. So, it is best to use ambience-type effects to best compliment the
internal reverb system. If you do not wish to use the internal reverb system,
simply adjust the RVB/RTN control to the OFF position.
NOTE: Sometimes you may wish to have two different effects at different levels
in addition to the internal reverb system. To achieve this you simply use the
effects send control to send the effects mix to both effects (you may need to use a
"Y" cord). Then simultaneously return the ouput of the effects to the EFF/RTN
jack and the AUX in jacks on the patch section of the MX641. You may
independently adjust the level of the effect by using the AUX/TAPE control and
the EFF/RTN control. (Remember the AUX/TAPE control adjusts the level of
both the AUX IN and TAPE IN connections). You may leave your tape deck
connected to the TAPE IN connections, but remember to return your TAPE/AUX
control back to its appropriate aux return level for your effect.
4. MASTER MONITOR LEVEL-
This is the main level control for the monitor output of the console. Each channel's
individual monitor level will be controlled by the channel monitor level control. The overall
volume of the monitor system will be controlled using the MON LVL (Master Monitor Level
Control). As with the main fader level control, this control should be run at a slightly lower
setting than the channel monitor level controls. This will provide the least electronic noise and
offer the best overall signal-to-noise ratio.
PATCH SECTION
1. TAPE IN (L,R)-
This patch connection is designed to accommodate the standard RCA type jacks used with normal
consumer tape recorders. The output of your tape recorder will plug into these connections and
will be adjusted in level by the AUX/TAPE control located on the Master Control Section.
2. EQ (IN,OUT)-
The MX641's graphic equalizer may be accessed using these jacks. Any external signal may be
inserted into the "EQ IN" jack (subsequently equalized by the graphic equalizer) and the
resultant "equalized" signal is then accessed by the EQ OUT connection. This is a very useful
feature for equalizing other signals (other than the main mix on the MX641). For example, the
monitors may be internally powered and equalized by using the patch jacks as follows:
A. MON OUT jack is fed into the EQ IN using a standard 1/4" shielded guitar type cord.
(Be sure the EQ "Patch" button is "OUT"). This ensures that the EQ is unassigned and
available to be patched).
B. The EQ OUT jack is fed into the PWR AMP IN jack using a shielded 1/4" shielded type
guitar cord. This connections allows the power amplifier to the equalized monitor
signal. The main signal feeding the power amplifier is disconnected when a cord is
patched into thè PWR AMP IN connection.
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C. You now have the monitor output feeding the equalizer and subsequently powered by
the internal power amplifier. If you wish to simply equalize the monitor signal
without internally powering it, you may send the EQ OUT signal to your monitor power
amplifier remotely.
3. EFF (Send, Return)-
The Effects send jack will feed the effect signal to your effect(s). The Effects return jack
accepts the output of your effect chain to be summed in the mix. The Effects send level is
controlled by the individual EFF/RVB level control on the channels. The Return Level of the
effects are adjusted using the EFF RTN control located on the Master Control Section of the
console.
4. AUX/IN-
The Auxiliary Input acts as another "line input” channel. It allows line level signals to be
returned to the MX641 without using any of the channels. The volume of this signal as it
appears at the main outputs is controlled by the AUX/TAPE return control on the Master Control
Section. This input may be used to chain other consoles, effects, tape decks or any other preamp
level signal to the MX641. In many ways it can be considered a seventh channel.
5. MON OUT-
This is the monitor output connection. The monitor signals from the MX641 are low
impedance. This means that you may run this signal through a snake cable (100' to 1000’) and
remotely powering of your monitor amplifiers. This is a pre-amp level signal and will drive
power amplifiers or inputs that will accept preamp levels. If you are not using stage monitors,
you may use this output to drive a tape deck for recording (offering independent channel record
levels while performing).
6. MAIN OUT-
This jack will access the preamp level signal from the main mix. Internally this signal is
connected (through the PWR AMP IN) ¡ack to the internal power amplifier. This output may be
used to record, or feed additional power amps if you expand your system.
NOTE: If you wish to record using the MX641, you do not need to have your speakers
plugged in. The MX641 will operate without speaker loads allowing you to use the
MX641 as a preamp mixer for recording or simple subgrouping.
7. PWR AMP IN-
This jack will access the internal power amplifier in your MX641. As soon as a connection is
made into this jack the internal routing of the signal from the main buss to the power amp
(through this jack) is disconnected. Any signal that is then inserted is then directly sent to the
power amplifier. The powered signal is then available at the speaker jacks at the rear of the
console. This feature is especially useful for internal powering of the monitors, biamplification
or simple access to the internal power amplifier of the MX641.
RAPHIC EQUALIZER
The graphic equalizer is designed to offer extensive control over the tonal response of your
main speakers. It will ultimately allow you to achieve the most natural "flat" response from
your speaker system. Graphic equalizers are aptly named for their "graphic representation” of
the volume level of various frequency bands. Instead of calling each bandpass, midrange, or
treble, each band is listed according to its exact frequency reference. Therefore the bands are
listed as 63Hz, 125Hz, 250Hz, 500Hz, 1000 Hertz 1k, 2k,4k, 8k, and 16k. These numbers
refer to the exact band that you will be adjusting as there are a few more controls than a
standard three band equalizer, and that setting up a graphic equalizer may appear more difficult.
This is "not" the case. In fact, you will probably find that using the graphic equalizer will be
simple--probably more simple to use than a conventional rotary control three or four band
equalizer.
At this point the best way to set your equalizer would be to experiment with the different
bands to become familiar with the different sounds of the equalizer. Set each of the bands at "0"
and boost/cut each band one at a time to become familiar with their respective sounds. Then
experiment with the overall sound of all the bands of the equalizer until it sounds good to you.
Let your ear be the best judge. Although there are more sophisticated methods of electronically
setting your equalizer for a flat response, the ear is usually the final judge of the best overall
sound. In addition, proper ear training will ultimately offer the most consistent results when
mixing your sound in various rooms.
In setting up your system, you should begin by setting the channel equalizers to the "0"
position and adjust the main graphic equalizer to deliver the best sound that suits your ear. You
should then make the appropriate adjustments on each channel to achieve the correct tonal
response and obtain the most uniform mix. Experimentation and use of this feature is the key to
mastering the best sound for your ear using the graphic equalizer.
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SECTION III
REAR PANEL FEATURES
1. A.C. LINE CORD-
When plugging in your MX641 console, be sure that you check the A.C. power source to be
sure itis from 110V to 120V, 50Hz or 60Hz. Also, recommended is using an A.C. power strip
that is both surge and broad band noise filtered. This will provide an extra margin of safety and
reliability for your console. FOR YOUR SAFETY - NEVER DEFEAT THE 3RD GROUNDING
PIN ON YOUR A.C. CORD.
2. POWER ON/OFF SWITCH -
This is the main A.C. switch for the mixer. It is normal to hear a slight thump when turning
ON and OFF your console. This "turn on transient" will not harm your speakers. It is always a
good idea to have your main level control "OFF" when turning on your mixer. This will
eliminate any possibility of feedback or excessively loud noises from too much gain when
initially turning on the mixer.
3. A.C. LINE FUSE -
The A.C. main fuse is a protective safety feature. If your mixer should have an electrical
malfunction, this fuse will protect the unit from further damage. You should never attempt to
increase the value of this fuse from the value listed on the back of the chassis. To do so could
cause damage to the mixer.
NOTE: If you ever need to run your mixer from an A.C. source produced by a generator,
you should use a properly "regulated" generator that will eliminate A.C. power surges.
Such surges could damage your console or result in blown fuses.
The recommended fuse values for the MX601 series consoles are as follows:
4.120V/240V SWITCH-
This switch selects the appropriate voltage. 120V/240V switching is only available on the
MX641 (higher powered) model. To determine if the switch is properly selected, simply look at
the switch. The voltage that you read on the switch indicates the voltage that is selected. You
may select the voltage by inserting a small screwdriver and moving the switch to the
appropriate position.
5. POWER AMP SPEAKER CONNECTIONS-
There are tw. 1/4" phone type speaker output jacks. These two jacks are wired in parallel.
It is very important that all your speaker cords be "non-shielded". This is the only place where
you will use a non-shielded cable with your system. Shielded cables (such as guitar cords) can
cause high performance amplifiers (as the one in the MX641 mixer) to oscillate due to cable
3-15
capacitance. Oscillation is a form of electronic feedback that can ultimately damage your
amplifier. See the following diagram to properly determine if your cables are shielded or not:
COMPARISON OF SHIELD/NON-SHIELDED CABLES
JACKET WIRE JACKET INSULATION
SHIELDED CORD NON-SHIELDED CORD
For speaker cable lengths up to 100, it is recommended that you use a 16 gauge or larger
wire. For speaker runs up to 300, it is recommended that you use 14 gauge wire. This will
proved the best possible "damping" performance from your amplifier and offer the greatest
power delivery to your speakers. It is also advisable that you turn your unit "OFF" when
connecting or disconnecting your speakers.
6. FORMULA FOR PARALLEL IMPEDANCE
Usually when you are simply plugging two or more speakers into your amplifier you will be
paralleling them to the ouput of your amp. In Series connections you will simply add the rated
impedance of the speakers together to find the loading:
EXAMPLE: 2 ohms + 2 ohms =4 ohms
When you are paralleling speakers, you should utilize the following formula to determine
your amplifier loading:
Take the rated impedance of each of your speakers, whether itis 8, 4, 3, 16 ohms or
whatever. Invert these numbers into fractions. For instance 8 ohms would become 1/8, 4
ohms would become 1/4, and so on. Add each of these fractions together and divide the
numberator by the denominator. The result will be your load impedance produced by your
speaker system. For instance, two 8 ohm speakers connected in parallel would provide the
following calculation:
1/8 + 1/8 = 2/8
Inverted = 8/2 = 4 ohms -TOTAL LOAD IMPEDANCE
Do not load the MX641's amplifier below its rate minimum impedance (2 ohms). To achieve
this you may have to utilize parallel, or series speaker connections. Please see the following
diagram for the difference between series and parallel connections.
4 OHMS 16 OHMS 8 OHMS
PARALLEL SERIES SERIES-PARALLEL
The actual formula for calculating parallel impedances is Z parallel = = + 4 = +, =
1 2 = в
The formula for series impedanceis Zseries = 7: + 7; + Zı +... Zn
If you have any questions regarding how many speakers you can run off your amplifier,
please do not hesitate to call CARVIN. We will be more than happy to help you determine if you
are operating your amplifier properly.
7. AMPLIFIER COOLING FINS-
These are the cooling fins for convective cooling of the power amp. You should be sure to
provide at least 4" space at the rear of your mixer (when using it against a wall) to provide for
sufficient cooling. Cooling air is drawn through the ifns and ventilated at the rear of the mixer.
3-17
SECTION IV
CONNECTIONS TO THE MX641 MIXER
INPUT CONNECTIONS
1. A.C. INPUT-
The A.C. main voltage should be 120V. The MX641 model console has dual voltage capability
120V/220V. Both units will operate on 50/60Hz. The 3-pin grounded type plug is standard
and is accommodated by all standard 3-pin American sockets. The color code of the cord is as
follows:
HI (Switched Leg).................ee.... Black
LO Neutral iu... ———— White
EARTH (Chassis Ground)............ Green w/Yellow Tracer
2. "XLR TYPE BALANCED INPUT"-
The 3-pin XLR input is provided on the front panel (channel input) of the MX601 series
mixers. This is a balanced bi-polar differential input capable of accepting impedances from
150 to 50,000 ohms. If you will be using microphone cables that are longer than ten feet, it is
recommended that you utilize the balanced inputs on your unit. Low impedance characteristally
allows for the best input performance from long cable runs, while electronic balancing helps to
reduce stray field "hum".
If you need to connect a single ended (RCA phono, or 1/4" phone connection) to the XLR or
1/4" phone plug input, you may utilize the following diagram for achieving the connection:
RCA TO 1/4" PHONE DIAGRAM
RCA TO XLR DIAGRAM
LINE LEVEL OUTPUT TO "LINE IN" OF
OF CONSOLE TAPE DECK
4-18
SECTION V
SERVICE /WARRANTY
SERVICING IN YOUR AREA
You may select your own service center or have your own qualified technician work on the
unit at your own expense. This will not void the warranty for future repairs unless damage was
done because of improper servicing or component replacement. If damage was done, a normal fee
for parts and servicing will be charged.
Under the ONE YEAR WARRANTY, Carvin will ship parts pre-paid to you or your technician
providing that the defective part(s) are first returned for our inspection.
It you do not have a qualified service person, we ask that you do not involve yourself in
servicing the unit. By sending the unit back to us, you may save time, money, and frustration.
Also, you will know that your unit was serviced according to factory specifications.
If it is necessary to have your unit serviced locally, we recommend that you have your
technician call us before servicing your unit. We find that those who do this are able to make
necessary repairs faster, and for less money. We are glad to help in this manner.
REMINDER: CARVIN DOES NOT PAY FOR SERVICING OR PARTS OTHER THAN OUR OWN - NO
EXCEPTIONS. IF YOU ELECT TO HAVE YOUR OWN SERVICING DONE, THESE BILLS MUST BE PAID
BY THE CUSTOMER.
CAUTION: TO PREVENT ELECTRIC SHOCK DO NOT DEFEAT THE SAFETY GROUND ON THE
POWER CORD. DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE TO RAIN, MOISTURE,
EXPLOSIVE ATMOSPHERE OR INSTALL AN IMPROPER FUSE!
FACTORY SERVICING PROCEDURES
We highly recommend utilizing our specialized servicing staff to bring your unit up to
factory specifications. Regardless of your warranty status, please follow these guidelines when
returning units for service:
1. Enclose a full description of the malfunction. Please use the "Service
Authorization Form" included with this manual.
2. Include a copy of the original invoice to verify your warranty.
5-19
3. Return the product in its original carton with the original packing material.
NEITHER CARVIN NOR THE SHIPPING COMPANY WILL ASSUME LIABILITY FOR
IMPROPERLY PACKED UNITS. Ship the unit by UPS if possible. You must
pre-pay the shipping cost.
4. Please allow five working days for servicing plus shipping time to and from
destination. All repairs in by MONDAY will be ready by the following MONDAY.
5. Carvin will pre-pay the shipping back to you providing the unit is covered under
warranty. If you wish to have it sent back by AIR, you will be required to pay the
difference COD.
6. If your unit is out of warranty, you will be charged a modest fee (generally lower
than typical repair shops). You must pay shipping charges both ways. These
charges will be collected COD.
7. If in doubt about the malfunction, please call a Carvin salesman toll-free at
800-854-2235. Occasionally we receive merchandise that works fine, but
because of an oversight, the unit was returned needlessly.
LIMITED WARRANTY
Your Carvin Professional Series Product is protected against failure for ONE YEAR. Carvin
will service the unit, supply all parts, and pay the RETURN shipping charges at no charge to the
customer providing the unit is under warranty. CARVIN WILL NOT PAY FOR PARTS OR
SERVICING OTHER THAN OUR OWN.
This warranty is extended to the original purchaser only and is not transferable. THIS
WARRANTY DOES NOT INCLUDE FAILURES CAUSED BY INCORRECT USE, INADEQUATE CARE OF
THE UNIT, OR NATURAL DISASTERS. A COPY OF THE ORIGINAL INVOICE IS REQUIRED TO VERIFY
YOUR WARRANTY.
Carvin takes no responsibility for any horn driver speaker damaged by this unit.
This warranty is in lieu of all other warranties, expressed or implied. No representative or
person is authorized to represent or assume for Carvin any liability in connection with the sale
or servicing of Carvin products. No liability is assumed for damage due to accident, abuse lack
of reasonable care, loss of parts, or failure to follow Carvin's directions. CARVIN SHALL NOT BE
LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.
In the interest of creating new products and improving existing ones, Carvin is continually
researching the latest state-of-the-art audio design methods, and modern packaging and
production techniques. Thus, Carvin reserves the right to make changes in its products and
specifications without notice or obligation.
5-20
TECHNICAL SPECIFICATIONS
Frequency Response Mic or line inputs:
Total Harmonic Distortion
Mic in to main out 30 dB gain
0 dBv output, 20-20kHz:
Line in to main out 6 dB gain
+10 dBv output, 20-20kHz:
20 Hz-20KH2 +1 dB
less than .03%
less than 02%
Equivalent Input Noise
unweighted, 150 source: -126 dBv
Output Noise (unweighted/20kHz B/W|
All controls minimum: -80 dBy
Master controls nominal w/ -75 dBv
Channel controls minimum:
Master controls nominal w/
one channel set for 40 dB gain:
Crosstalk Adjacent channels:
Common Mode Rejection Ratio
Phantom Power (MX641)
Channel Equalizer Type:
Hi-band:
Low band:
Type:
Max boost'cut:
Center trequencies:
Graphic Equalizers (2)
(non-powered models)
-80 dBv (powered models)
-82 dBv
-79 dBv (powered models)
-60 dB at 1kHz
-50 dB at 10kHz
-75 dB at 1kHz
-60 dB at 100 Hz
+48V DC applied lo pins 2 and 3 of XLR
2 band active
+15 dB (9 10kHz
+15 dB @ 80Hz
9 band at octave intervals
+15 dB
63, 125, 250, 500, 1k, 2k, 4k, 8k, 16k
Mic Input Connector:
Input impedance:
Source impedance
Nominal input range:
Maximum input level:
Connector:
Input impedance:
Nominal input range:
Maximum input level:
Mic in to main out
Line in to main out:
Effects return to two-track out
Unbalanced output
Maximum output leve!
(10k À load
Monitor and Effects Outputs
Nominal output level
Maximum output level
Line Input
Maximum Gain
Output
3-pin XLR type
3k Q [balanced]
nominal “low impedance” [50 Q to 1K 9)
-70 to -10 dBv [3mV to 300mVO
+10 dBv (3.3 Vi
14" phone ¡ack
22k (1) [unbalanced]
-20 dBv to +10 dBv (100mY to 3V)
+10 dBv
60 dB
20 dB
22 dB
'4" phone jack
+20 dBv unbalanced
+26 dBv balanced
"" phone (unbalanced;
+4 dBy
+20 dBv (10k Q load]
Power Amplifier MX621 200W@2Q 150WE4N 100W Во
MX641 400 М @20 300 М @4 0 150W@82
Total harmonic distortion: 0.1% (20 Hz to 20kHz)
Frequency response: 20 Hz to 60kHz (-30B)
Power Supply Fully regulated 8 protected
Power Requirements MX621 120V, MX641 120 240V
Warranty 1 year parts and labor
CARVIN
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