Alesis MULTIMIX 12R Reference Manual
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Alesis MULTIMIX 12R Reference Manual

Alesis MULTIMIX 12R Reference Manual

Mixer / microphone preamplifier
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MIXER / MICROPHONE PREAMPLIFIER
R
EFERENCE
M
ANUAL
2002

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  • Page 1 MIXER / MICROPHONE PREAMPLIFIER EFERENCE ANUAL 2002...
  • Page 2 Important Safety Instructions...

  • Page 3: Important Safety Instructions

    Important Safety Instructions Important Safety Instructions (English) Safety symbols used in this product This symbol alerts the user that there are important operating and maintenance instructions in the literature accompanying this unit. This symbol warns the user of uninsulated voltage within the unit that can cause dangerous electric shocks.
  • Page 4 12. Use only with a cart, stand, bracket, or table designed for use with professional audio or music equipment. In any installation, make sure that injury or damage will not result from cables pulling on the apparatus and its mounting. If a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
  • Page 5 Instructions de Sécurité Importantes (French) Symboles utilisés dans ce produit Ce symbole alèrte l’utilisateur qu’il existe des instructions de fonctionnement et de maintenance dans la documentation jointe avec ce produit. Ce symbole avertit l’utilisateur de la présence d’une tension non isolée à l’intérieur de l’appareil pouvant engendrer des chocs électriques.
  • Page 6 Suite de la page suivante 12. N’utilisez qu’avec un stand, ou table conçus pour l’utilisation d’audio professionnel ou instruments de musique. Dans toute installation, veillez de ne rien endommager à cause de câbles qui tirent sur des appareils et leur support. 13.
  • Page 7 Lesen Sie bitte die folgende Sicherheitshinweise (German) Sicherheit Symbole verwendet in diesem Produkt Dieses Symbol alarmiert den Benutzer, daß es wichtige Funktionieren und Wartung Anweisungen in der Literatur gibt, die diese Maßeinheit begleitet. Dieses Symbol warnt den Benutzer der nicht isolierten Spannung innerhalb der Maßeinheit, die gefährliche elektrische Schläge verursachen kann.
  • Page 8 Fortsetzung auf nächster Seite 12. Verwenden Sie ausschließlich Wagen, Ständer, oder Tische, die speziell für professionelle Audio- und Musikinstrumente geeignet sind. Achten Sie immer darauf, daß die jeweiligen Geräte sicher installiert sind, um Schäden und Verletzungen zu vermeiden. Wenn Sie einen Rollwagen benutzen, achten Sie darauf, das dieser nicht umkippt, um Verletzungen auszuschließen.
  • Page 9 Important Safety Instructions CE Declaration Of Conformity See our website at: http://www.alesis.com FCC Compliance Statement This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.

  • Page 11: Table Of Contents

    ABLE OF Table of Contents ... 1 Introduction...3 The Alesis Multimix 12R Microphone Preamplifier/Mixer...3 Using this manual...3 Grounding Instructions...4 Installation ...5 Unpacking ...5 AC power...5 Grounding...5 Use clean power ...6 Power switch...6 Mounting...6 Connections ...7 Inputs ...7 Cable common sense...7 Microphone Inputs...8...
  • Page 12 Introduction AUX System: Effects Send/Receive...30 How to Set Aux Send and Return Levels ...30 Using the meter...32 Avoiding noise...33 System noise (ground loops, hum, induced noise)...33 Applications...37 Multitrack recording...37 Tracking/Overdubbing...37 Mixdown...38 Using the HIGH and LOW EQ controls...39 Monitoring AUX 1 in the PHONES jack ...40 Troubleshooting...41 Troubleshooting Index...41 Maintenance/Service...43...

  • Page 13: Table Of Contents

    Using this manual To get the most out of your Multimix 12R, please read this manual. While the mixer is not complicated to operate, the manual contains information that will help you get the highest level of performance from it.

  • Page 14: Grounding Instructions

    Introduction Grounding Instructions This product must be grounded. If it should malfunction or break down, grounding provides a path of least resistance for electric current to reduce the risk of electric shock. This product is equipped with a cord having an equipment-grounding conductor and a grounding plug.

  • Page 15: Installation

    READ ALL SAFETY WARNINGS IN THE PREVIOUS SECTION OF THIS MANUAL TO ENSURE SAFE OPERATION OF THIS UNIT. Connect the Multimix 12R to the specified power using the AC cable supplied with the unit. The AC cable is removable. If the distance to...

  • Page 16: Use Clean Power

    The POWER switch is located on the back panel. A power indicator is on the front panel next to the meter. Avoid turning the power switch on or off while the Multimix 12R is connected to a live amplifier. Mounting The Multimix 12R may be rack mounted in a standard EIA 19"...

  • Page 17: Connections

    Inputs Cable common sense Make all connections to the Multimix 12R with the power turned off wherever possible. If you must connect or disconnect inputs while power is on, make sure the channel fader and [TRIM] are turned all the way down to avoid sudden pops and clicks which may damage speakers or other equipment.

  • Page 18: Microphone Inputs

    Connections Microphone Inputs The Alesis Multimix 12R features eight studio-grade, low-noise hybrid microphone preamplifiers. These [MIC] jacks are designed to work with almost any low-impedance microphone using standard 3- conductor XLR connectors. The [MIC] jacks also feature 48 volt phantom power, which may be turned on and off by the [PHANTOM] switch on the back panel, for condenser microphones which require external powering.

  • Page 19: Phantom Power

    DC through the microphone cable. If any of your microphones need phantom power, turn on the [PHANTOM POWER] switch on the Multimix 12R’s back panel to connect all the XLR MIC IN jacks to the Multimix 12R’s internal 48 volt phantom power source. Since the power is applied equally to pins 2 and 3, phantom power should not affect dynamic microphones (which do not require phantom power).

  • Page 20: Line-Level Devices (Synthesizers, Cd Players, Video)

    Electric guitars and basses may be plugged directly into the [LINE IN] jacks, if you raise the [TRIM] level. The Multimix 12R has more than enough gain (up to 50 dB when the channel fader and trim are set to...
  • Page 21 IN] jacks are designed to handle these balanced inputs. Balanced sources often feature XLR outputs. However, they should NOT be connected to the XLR [MIC] inputs of the Multimix 12R unless absolutely necessary, because the higher gain of the MIC jacks gives you less headroom than the LINE IN jacks do (also, the source could be damaged by phantom power if it's turned on).

  • Page 22: Tape In Jacks

    [MONITOR OUT] and [PHONES] jacks only. A signal at the [TAPE IN] jacks cannot be heard from the [MAIN OUT] jacks. This allows you to use the Multimix 12R to monitor a mixdown to a 2- track deck through your headphones. (If you plugged your mixdown deck into the line inputs on the channels, it would cause feedback when you press “record”.) By placing the [PHONES/MONITOR]...

  • Page 23: Phonograph Turntables

    If you're using a record turntable, you may not plug it directly into the line inputs of the Multimix 12R (well, you can, but it will sound very thin and noisy). Obtain a phono preamp from your dealer or an electronics specialty store.

  • Page 24: How To Connect Effect Devices And Signal Processors

    How to connect effect devices and signal processors Alesis and other companies make many different types of signal processors which may be connected to the Multimix 12R mixer. There are two ways to connect these units: using the AUX system or via the INSERT jacks.

  • Page 25: In-Line Processing Using The Insert Jacks (Compressors & Equalizers)

    “dry” stereo signal when the effect is connected directly between an instrument and an amplifier. In mixing applications such as with the Multimix 12R, you will set the effect’s wet/dry balance all the way to “wet” (effects only, no direct signal). The effect device will generate an artificial stereo output from the signal input.
  • Page 26 1/4" plugs on the other end is required. Note that you will not hear any signal through the Multimix 12R if the INSERT jack is plugged in and the signal is interrupted in that loop (by the other cables being disconnected, the processor being turned off, or the volume turned off in the processor).
  • Page 27 This will allow playback monitoring of the recorder. See the Applications chapter for more information. For more information on using the AUX and INSERT systems, see the “Operating Instructions” chapter of this manual. Multimix 12R Reference Manual...

  • Page 28: Outputs

    Balanced Check to see if your amplifier can accept balanced inputs. If so, connect the [MAIN OUT BALANCED] jacks of the Multimix 12R to the input of the amp using a 3-conductor cable, with a 1/4" TRS plug on one end, and the connector used by the amp (usually a 1/4" TRS connector;...

  • Page 29: To Another Mixer

    To another mixer The main or monitor outputs of the Multimix 12R may be connected to a larger mixing console. Consult the manual for the other mixer for more information. If the mixer has "SUB IN" jacks, connect to those.

  • Page 30: To An Adat Multitrack Recorder

    ADAT-XT and a Multimix 12R is portable, cost- effective, easy to use, and sonically transparent. There are two ways to use the Multimix 12R with ADAT: a single mixer with the ADAT patched into the [INSERT] jacks, or using two Multimix 12Rs, one for input and another for monitoring.
  • Page 31 "source" mixer which feeds the ADAT's inputs, and the other is the "monitor/mixdown" mixer which receives the ADAT's outputs. 1. Plug the -10 dBV MAIN OUT jacks of the "source" 12R to track inputs 1 and 2 of the ADAT. Multimix 12R Reference Manual INPUT OUTPUT LOCATE/PLAY...
  • Page 32 Connections • Because the ADAT has normalled inputs, the stereo output of the source mixer may be recorded on other tracks without repatching. The left output of the mixer will appear at the inputs of tracks 1, 3, 5 & 7; the right output will appear at track 2, 4, 6 &...

  • Page 33: Phones

    MAIN OUT. The PHONES control may be lowered to the point where the MONITOR OUT is almost at microphone level, low enough to be patched into the microphone-level inputs of a camcorder or house PA system. However, connect the monitor output to line level inputs wherever possible. Multimix 12R Reference Manual...
  • Page 34 Connections...

  • Page 35: Operating Instructions

    To avoid surprises while you're setting up a new system, set all controls to their "zeroed out" positions as follows before proceeding: 1. Make all connections to the Multimix 12R, as described in the previous chapter. 2. Bring all channel faders and the [MASTER] fader down to minimum.

  • Page 36: Setting Input Trim Levels

    Instead of doing this, get as much gain as possible as close to the signal source as possible. If you've plugged a synthesizer or other line-level source into the Multimix 12R, set its output volume to maximum. If a microphone is the source, the Multimix 12R's [TRIM] control will determine the gain of the system.

  • Page 37: Metering/Unity Gain Method

    (off). 3. Set the MASTER fader to 0 dB (all the way up). 4. Observe the Multimix 12R's LED Meter. Adjust the [TRIM]knob until the average signal level on the meter is about 0 dB (highest green LED), or peaks do not exceed the +10 dB LED (or whatever maximum your system is designed for).

  • Page 38: Typical Fader And Control Levels

    Unity gain points Unlike many other mixers, the Multimix 12R's [MASTER] fader is designed for unity gain (0) when the fader is up full, not at 3/4 or 1/2 of the travel. This allows you greater control to use the fader for smooth, gradual fade-outs.

  • Page 39: Proper Gain Staging Of Other Equipment

    The EQ is capable of adding quite a bit of gain and is a frequent cause of overload distortion problems. The PEAK LEDs monitor the signal after the EQ circuit, both pre and post fader. Multimix 12R Reference Manual...

  • Page 40: Aux System: Effects Send/Receive

    Operating Instructions AUX System: The AUX 2 buss of the Multimix 12R is a post-fader send. Usually, you will connect AUX 2 to the input of an effect device. Using a post-fader send means that when you fade a channel out, its effects will fade out also.
  • Page 41 "just a hint" of reverb, don't turn down the Aux 2 send; turn down the Aux Return. Leave the input levels of the effect device where they were set in step 4, unless you see the device's overload indicator flash. Multimix 12R Reference Manual Operating Instructions...

  • Page 42: Using The Meter

    ✪ As long as the meter of the Multimix 12R is below its top LED, and the PEAK LEDs of all channels are off, the mixer should not be causing distortion. If...

  • Page 43: Avoiding Noise

    Avoiding noise If the Multimix 12R is being run as suggested above, the noise of the mixer itself will not be a significant factor in the noise level of your system, since the Multimix 12R generates much less noise than the typical source does.
  • Page 44 But since almost all of the inputs and outputs of the Multimix 12R are balanced, the ground does not have to be made part of the signal path unless you are connecting to unbalanced equipment.
  • Page 45 Even though the mixer- to-amp connection is balanced, any unbalanced sources or effects plugged into the mixer may exhibit a hum when the amp's ground is carried back to the mixer. Multimix 12R Reference Manual...
  • Page 46 Operating Instructions...

  • Page 47: Applications

    Multitrack recording See the "Connections" chapter for information on how to connect the Multimix 12R to an ADAT or other multitrack recorder. In the most common setup, the ADAT is patched into the INSERT points of each channel. It receives signal directly from the [TRIM] control;...

  • Page 48: Mixdown

    Applications Mixdown You may leave the ADAT connected to the INSERT jacks for mixdown; there's no need to repatch to the LINE IN jacks. Make the connections according to the procedure in the "Connections" chapter. 1. Connect the MAIN OUTs (-10 dBV or +4 dBu, depending on the deck) to the inputs of the mixdown deck.

  • Page 49: Using The High And Low Eq Controls

    Using the HIGH and LOW EQ controls The Multimix 12R provides standard shelving EQ controls on each channel. The HIGH knob range is +/- 15 dB with a shelving frequency of 12 kHz. "Shelving" means that all frequencies above 12 kHz will be boost or cut by the same amount , and frequency response between 1 kHz and 12 kHz will gradually rise or fall to the shelving point.

  • Page 50: Monitoring Aux 1 In The Phones Jack

    Applications Monitoring AUX 1 in the PHONES jack If you are using AUX 1 as a monitor feed, you may want to check that mix using the headphones. If you've connected the PA or recorder to the MAIN OUTPUTS, and are not using the TAPE IN jacks, use Y-cords to connect the AUX 1 SEND to the TAPE IN jack(s) at the same time it feeds the monitor amplifier.

  • Page 51: Troubleshooting Index

    Troubleshooting Index If you experience problems while operating the Multimix 12R, please use the following table to locate possible causes and solutions before contacting Alesis Product Support or your dealer for assistance. Symptom The Power LED does not light when the unit is powered on.
  • Page 52 Specifications Hum or noise from output. No meter, although audio is heard through main outputs. Crackling sounds. Ground loop, Try plugging the unit unshielded cables. into another power jack or different audio cables. Monitor switch is set Set switch to "MSTR" to “TAPE”...

  • Page 53: Maintenance/Service

    Refer All Servicing to Qualified Technicians We believe that the Multimix 12R is one of the most reliable mixers that can be made using current technology, and should provide years of trouble-free use. However, should problems occur, DO NOT attempt to service the unit yourself.

  • Page 54: Specifications

    STEREO AUX RETURN jacks: MAIN OUT BALANCED, MONITOR OUT, and AUX SEND jacks: MAIN OUT -10 dBV jacks: TAPE IN jacks: Multimix 12R Reference Manual PECIFICATIONS (any input to any output at nominal operating levels) 125 kHz Female XLR (Pin 1 ground, Pin 2 +, Pin 3 -) Female 1/4"...

  • Page 55: Levels

    Specifications Levels MIC IN LINE IN STEREO LINE IN MAXIMUM GAIN CHANNEL PEAK LED ON: METER: MAIN OUT LEVEL (1/4" phone jacks) (when meter is at 0 VU) MAIN OUT LEVEL (phono jacks) MAXIMUM OUTPUT LEVEL MONITOR OUT LEVEL INSERT/DIRECT OUT (tip) INSERT IN (ring) HEADROOM: Impedance...

  • Page 56: Noise Performance (Typical)

    At INSERT jack: At MAIN OUT (+21 dBu balanced output level) Power U.S.A. model: Mounting 19" EIA rack mountable, 3 spaces Multimix 12R Reference Manual Specifications -128.5 dBu Equivalent Input Noise at maximum gain <-88 dBu <-85 dBu unbalanced (+22 dB max unbalanced out = 107 dB dynamic range) Better than 0.0010%...

  • Page 57: Dimensional Drawing

    Specifications IMENSIONAL RAWING...

  • Page 58: Block Diagram

    Specifications LOCK DIAGRAM Multimix 12R Reference Manual...

  • Page 59: Level Diagram

    Specifications Level diagram...

  • Page 60: Index

    MSTR/TAPE switch, 14, 21 affects meter, 34 noise, 7, 28, 35, 49 nominal, 34 PA system, 14, 20 PEAK, 28, 34 Phantom power, 13 Multimix 12R Reference Manual NDEX PHONES, 25 PHONES/MONITOR, 14, 34 phonograph, 15 post-fader, 32 pre-fader, 17...
  • Page 61 For the most effective service, the purchaser should register the purchase on the ALESIS website at http://www.alesis.com/support/warranty.htm. During the warranty period ALESIS shall, at its sole and absolute option, either repair or replace free of charge any product that proves to be defective on inspection by ALESIS or its authorized service representative.
  • Page 62 Alesis Multimix 12R Reference Manual Revision 1.0 by Brooks Bruner Copyright 2002, Alesis Distribution, LLC. All rights reserved Reproduction in whole or in part is prohibited. “Multimix 12R” is a trademark of Alesis Distribution, LLC. Specifications subject to change without notice.

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