Alesis MultiMix 12R Reference Manual

Alesis MultiMix 12R Manual

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  • Alesis MultiMix 12R | Reference Manual - Page 1
    MIXER / MICROPHONE PREAMPLIFIER REFERENCE MANUAL 2002
  • Alesis MultiMix 12R | Reference Manual - Page 2
    Important Safety Instructions
  • Alesis MultiMix 12R | Reference Manual - Page 3
    (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. This
  • Alesis MultiMix 12R | Reference Manual - Page 4
    Important Safety Instructions 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
  • Alesis MultiMix 12R | Reference Manual - Page 5
    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'int
  • Alesis MultiMix 12R | Reference Manual - Page 6
    Important Safety Instructions 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. Dé
  • Alesis MultiMix 12R | Reference Manual - Page 7
    Important Safety Instructions 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
  • Alesis MultiMix 12R | Reference Manual - Page 8
    Important Safety Instructions 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
  • Alesis MultiMix 12R | Reference Manual - Page 9
    Important Safety Instructions CE Declaration Of Conformity See our website at: http://www.alesis.com FCC Compliance Statement This device complies reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the
  • Alesis MultiMix 12R | Reference Manual - Page 10
    Gain FRONT PANEL High Frequency EQ Low Frequency EQ Aux Send 1 (Pre Fader) Aux Send 2 (Post Fader) Channel Channel Fader Pan/Balance Main Out REAR PANEL Monitor Out Phantom Power Indicator Master Level Stereo Aux Return Level Phones/Monitor Level Monitor Select Switch Master Fader
  • Alesis MultiMix 12R | Reference Manual - Page 11
    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
  • Alesis MultiMix 12R | Reference Manual - Page 12
    41 Troubleshooting Index 41 Maintenance/Service 43 Exterior cleaning 43 Specifications 45 Frequency Response 45 Connectors ...45 Levels ...46 Impedance ...46 Noise performance (typical 47 Distortion (THD+N 47 Power ...47 Mounting ...47 Dimensional Drawing 48 Block diagram 49
  • Alesis MultiMix 12R | Reference Manual - Page 13
    Introduction INTRODUCTION The Alesis Multimix 12R Microphone Preamplifier/Mixer The Alesis Multimix 12R is a high-quality, rack-mountable 12-input, stereo output audio mixer. It is designed to handle eight microphones, two stereo line inputs, and to route signal to and from external effect
  • Alesis MultiMix 12R | Reference Manual - Page 14
    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
  • Alesis MultiMix 12R | Reference Manual - Page 15
    12R features balanced inputs and outputs, so if it is properly connected to other balanced units, AC ground potentials will not affect the audio. If you cannot get rid of ground loops, consult a professional electrician familiar with sound system power designs. Multimix 12R Reference Manual
  • Alesis MultiMix 12R | Reference Manual - Page 16
    most audio equipment) if it is mounted into metal rack rails, the chassis ground of all units in the rack will be connected together by the rail. In some cases this is desirable, but if hum is a problem in the system, you may need to install nonconductive rack screws and washers on the Multimix 12R
  • Alesis MultiMix 12R | Reference Manual - Page 17
    . Use good-quality cable: 99% of all mixer problems turn out to be cable or connector problems. Use the best quality cable you can, for not bundle audio cables with AC power cords. • Avoid running audio cables, or placing the Multimix 12R itself, near turns. Multimix 12R Reference Manual 7
  • Alesis MultiMix 12R | Reference Manual - Page 18
    Connections Microphone Inputs The Alesis Multimix 12R features eight studio-grade, low-noise hybrid microphone with up to 60 dB of amplification available (which is 10 to 20 dB more than many other rack-mount mixers). It is wired with "pin 2 hot" according to the accepted standard. ✪ Use only one
  • Alesis MultiMix 12R | Reference Manual - Page 19
    from the mixer. "Phantom power" sends 48 volts of 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 microphones need phantom power, leave the phantom power switch off. Multimix 12R Reference Manual 9
  • Alesis MultiMix 12R | Reference Manual - Page 20
    players, and drum machine main outputs into the STEREO LINE channels (9/10 and 11/12) if possible. 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
  • Alesis MultiMix 12R | Reference Manual - Page 21
    12R may cause damage to the external unit. Alesis cannot be responsible for any damages caused by this kind of misuse. The nominal trim setting for a +4 dBu signal plugged into a line input is approximately 11 o'clock (12 dBu (balanced or unbalanced) maximum input. Multimix 12R Reference Manual 11
  • Alesis MultiMix 12R | Reference Manual - Page 22
    use the Multimix 12R to monitor a mixdown to a 2track 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] switch in the TAPE position, you will hear the mixer
  • Alesis MultiMix 12R | Reference Manual - Page 23
    not connect any of the following to any input of the Multimix 12R! • The speaker output of any power amplifier. • Any source that is too loud for the input (no more than 3 volts RMS into a [MIC] jack or 13 volts RMS into a [LINE IN] jack). • Any unshielded cable. Multimix 12R Reference Manual 13
  • Alesis MultiMix 12R | Reference Manual - Page 24
    signal processors Alesis and other companies make many different types of signal processors which may be connected to the Multimix 12R mixer. There POST) AUX SEND output of the 12R to the input of the effect device. If the effect has a stereo input, check the manual of the effect to see which jack
  • Alesis MultiMix 12R | Reference Manual - Page 25
    In mixing applications such as with the Multimix 12R, you will set the effect's wet manual for your effect device for more information. On the other hand, true dual-channel effects processors (such as the Alesis and [TRIM] control, but before the Multimix 12R's own EQ, aux sends, and fader.
  • Alesis MultiMix 12R | Reference Manual - Page 26
    Send Return Ground Tip Ring Sleeve Tip Ring Sleeve 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 click" (the ring connector) and it will not interrupt the flow through the mixer, while
  • Alesis MultiMix 12R | Reference Manual - Page 27
    recorder into each channel path of the mixer. 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 17
  • Alesis MultiMix 12R | Reference Manual - Page 28
    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 recommend connecting a third-octave graphic equalizer such as the Alesis MEQ-230 between the mixer and the amp to control feedback. The Aux 1
  • Alesis MultiMix 12R | Reference Manual - Page 29
    manual for the other mixer for more information. If the mixer has "SUB IN" jacks, connect to those. Alternatively, you may simply connect the MAIN OUT or MONITOR OUT jacks of the Multimix 12R to two line-level inputs on the other mixer switch while in record mode. Multimix 12R Reference Manual 19
  • Alesis MultiMix 12R | Reference Manual - Page 30
    is portable, costeffective, 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. In-line ADAT recording: In this hookup method
  • Alesis MultiMix 12R | Reference Manual - Page 31
    dedicated recording consoles. One 12R is the "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 21
  • Alesis MultiMix 12R | Reference Manual - Page 32
    to LINE IN 1-8 of the "monitor/mixdown" 12R. Note that output 1 is on the left of the ADAT, but on the right of the mixer, so the wires must cross over. 3. To time, plug a mono cable from the INSERT jack of any channels of the mixer to the input of any track. By plugging the cable all the way in
  • Alesis MultiMix 12R | Reference Manual - Page 33
    ; however, there should be enough gain to drive any dynamic headphone to reasonable levels, if the mixer is being run properly. Note that the PHONES/MONITOR level control on the front panel affects both the monitor output to line level inputs wherever possible. Multimix 12R Reference Manual 23
  • Alesis MultiMix 12R | Reference Manual - Page 34
    Connections
  • Alesis MultiMix 12R | Reference Manual - Page 35
    ). 4. Set all [AUX 1], [AUX 2], STEREO AUX RETURN, [PHONES/MONITOR] controls to minimum (full counterclockwise). 5. Set all [HIGH] and [LOW] EQ, [PAN], and [BAL] controls to "12 o'clock". Multimix 12R Reference Manual 25
  • Alesis MultiMix 12R | Reference Manual - Page 36
    Instructions the mixer. the Multimix 12R has its own [PEAK] indicator, which will light when the signal level rises to within 6 dB of clipping. In situations where the maximum signal-to-noise ratio is required (such as digital recording), use the PEAK LED as a guide below unity (12 o'clock position
  • Alesis MultiMix 12R | Reference Manual - Page 37
    Operating Instructions Metering/Unity Gain method This method gives you more headroom than the peak method, while maintaining a low noise floor which PEAK LED flash, you are within 6 dB of signal overload. Turn down the TRIM knob until the PEAK LED stops flashing. Multimix 12R Reference Manual 27
  • Alesis MultiMix 12R | Reference Manual - Page 38
    Instructions are only a starting point. Unity gain points Unlike many other mixers, the Multimix 12R's [MASTER] fader is designed for unity gain (0) when the Level Diagram near the end of this manual for a graphic display of the gain structure of the mixer. Aux Send levels The nominal or unity gain
  • Alesis MultiMix 12R | Reference Manual - Page 39
    trim control, or the channel fader, or both. 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 29
  • Alesis MultiMix 12R | Reference Manual - Page 40
    Operating Instructions AUX System: Effects Send/Receive The AUX 2 buss of the Multimix 12R is a post-fader send. Usually, you already at the mixer). Consult the manual for the effect device to find out how to set the effect so that only effected ("wet") signal is returned to the Multimix 12R. How to
  • Alesis MultiMix 12R | Reference Manual - Page 41
    a procedure that will give good results with most standard equipment: 1. Set your mixer's input levels correctly, following the instructions earlier in this chapter. 2. Turn up the channels' [AUX 2] sends to 4, unless you see the device's overload indicator flash. Multimix 12R Reference Manual 31
  • Alesis MultiMix 12R | Reference Manual - Page 42
    Operating Instructions Using the meter The meter of the Multimix 12R is a fast peak type that reads in so that "0" on the mixer's meters equals "0 VU" on the recorder's meters. Digital recorders use a different reference; for example, an ADAT connected to the Multimix 12R's outputs will read "-15
  • Alesis MultiMix 12R | Reference Manual - Page 43
    hum occurs, try moving the audio wiring around to see if the hum ceases or diminishes. If it's not possible to separate the audio and AC wiring, make sure that the audio wires don't run parallel to any AC wire (they should only cross at right angles, if possible). Multimix 12R Reference Manual 33
  • Alesis MultiMix 12R | Reference Manual - Page 44
    not have to be made part of the signal path unless you are connecting to unbalanced equipment. If the Multimix 12R is mounted in a metal rack, the mixer shares a common ground with the other equipment in the same rack. In some cases (such as a star ground scheme), you may need to use nonconductive
  • Alesis MultiMix 12R | Reference Manual - Page 45
    Operating Instructions rack from being conducted back to the mixer. Even though the mixerto-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 35
  • Alesis MultiMix 12R | Reference Manual - Page 46
    Operating Instructions
  • Alesis MultiMix 12R | Reference Manual - Page 47
    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 input to track 2 to any even-numbered track. Check the manual of the ADAT or XT for more information. Multimix 12R Reference Manual 37
  • Alesis MultiMix 12R | Reference Manual - Page 48
    /pause mode, play the ADAT, and adjust the mix and level controls of the mixer for the desired level. Set the MASTER fader up to the maximum, and adjust the the desired reading. You will also be able to see the levels on the mixer itself; check to make sure the output of the mixdown deck is set to
  • Alesis MultiMix 12R | Reference Manual - Page 49
    15 dB -15 dB 20 Hz 100 Hz 1 kHz 10k 20k ✪ The normal position for the EQ controls is "12 o'clock" or straight up. A "click" or detent will be felt at this position. At this position, the may cause clipping in the channel electronics, and will amplify noise. Multimix 12R Reference Manual 39
  • Alesis MultiMix 12R | Reference Manual - Page 50
    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
  • Alesis MultiMix 12R | Reference Manual - Page 51
    TROUBLESHOOTING 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 on mixer Aux Return level on is up full. mixer. Increase Aux Send levels. No audio is
  • Alesis MultiMix 12R | Reference Manual - Page 52
    noise from output. Ground loop, unshielded cables. No meter, although Monitor switch is set audio is heard through to "TAPE" main outputs. Crackling sounds. Dirty or corroding connections on back of mixer. A microphone cable has a small short or break. Try plugging the unit into another
  • Alesis MultiMix 12R | Reference Manual - Page 53
    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. Service on this product should be performed only by qualified technicians. NO USER-SERVICEABLE PARTS INSIDE. Multimix 12R Reference Manual 43
  • Alesis MultiMix 12R | Reference Manual - Page 54
    Specifications SPECIFICATIONS All measurements taken with an Audio Precision System One. All noise measurements taken with trim at minimum and -, sleeve = ground) MAIN OUT -10 dBV jacks: TAPE IN jacks: Female phono ("RCA") jacks Female phono ("RCA") jacks Multimix 12R Reference Manual 45
  • Alesis MultiMix 12R | Reference Manual - Page 55
    MIC IN -60 dBu to -10 dBu nominal, maximum level +12 dBu LINE IN -40 dBu to +10 dBu nominal, maximum PEAK LED ON: 6 dB below channel clipping METER: Peak type -24 dB to PK (+18 dB over reference at MAIN OUT, 6 dB before output clipping) MAIN OUT LEVEL (1/4" phone jacks) (when meter is at
  • Alesis MultiMix 12R | Reference Manual - Page 56
    Residual output noise (MASTER fader at nominal, channel faders at minimum):
  • Alesis MultiMix 12R | Reference Manual - Page 57
    Specifications DIMENSIONAL DRAWING
  • Alesis MultiMix 12R | Reference Manual - Page 58
    Specifications BLOCK DIAGRAM Multimix 12R Reference Manual 49
  • Alesis MultiMix 12R | Reference Manual - Page 59
    Specifications Level diagram
  • Alesis MultiMix 12R | Reference Manual - Page 60
    mixer system, 24 Levels, 13, 28, 48 diagram, 52 LINE IN, 12 rack, 8, 36 reverbb, 16 Service, 12 maximum input level, 13 PEAK LED, 28 TAPE IN, 14 as Aux 1 monitor, 42 tape recorder, 21 TRIM, 9, 13, 22, 28, 29, 30, 39 TRS, 17, 20 Unity gain, 30 wet/dry, 17, 32 XLR, 10, 13 Multimix 12R Reference Manual
  • Alesis MultiMix 12R | Reference Manual - Page 61
    authorized Alesis service representative in the country of sale. For warranty information in all other countries please refer to your local distributor. For more effective service and product update notices, please register your Multimix 12R online at: http://www.alesis.com/ support/warranty.htm
  • Alesis MultiMix 12R | Reference Manual - Page 62
    USA E-mail: Website: [email protected] http://www.alesis.com 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
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MIXER / MICROPHONE PREAMPLIFIER