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Alesis 12R - page 1
R EFERENCE M ANUAL 2002 MIXER / MICROPHONE PREAMPLIFIER ...
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Alesis 12R - page 2
Important Safety Instructions ...
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Alesis 12R - page 3
Important Safety Instructions Important Safety Instructions (English) Safety symbols used in this product This symbo l alerts the us er that there are impor tant operating and maintenance i nstr uctions in the li terature accompanying this un it. This symbol war ns the user of uninsulated voltage within the unit that can cause dang erous electric s ...
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Alesis 12R - page 4
Important Safety Instructions 12. Use only with a car t, stand, b rack et, or table designed for use with professional audi o or music e quipment. In any installation, make sure that injur y or damage will not result from cables pulling on the app aratus and its mounting . If a cart is us ed, use caution when moving the car t/appa ratus combination ...
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Alesis 12R - page 5
Important Safety Instructions Instructions de Sécurité Importantes (French) Symboles utilisés dans ce produit Ce symbole alèr te l’utilisateur qu’il existe des instr uctions de fonctionneme nt et de maintenance dans la documentation jointe avec ce produit. Ce symbole avertit l’utilisat eur de la présence d’une tension non isolée à l ...
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Alesis 12R - 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 professionne l ou instruments de musique . Dans toute installation, veillez de ne rien endommager à cause de câbles qui tirent sur de s appareils et leu r support. 13. Débranchez l’appareil lors d’un o ...
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Alesis 12R - page 7
Important Safety Instructions Lesen Sie bitte die folgende Sicherheitshinweise (German) Sicherheit Symbole verwendet in diesem Produkt Dieses Symbol alar miert den Benutzer, daß es wichtige Funktioniere n und W ar tung Anweisungen in der Literatur gibt, di e diese Maßeinheit begleitet. Dieses Symbol w ar nt den Benutzer der nic ht isolierten Span ...
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Alesis 12R - page 8
Important Safety Instructions F or tsetzung auf nächster Seite 12. V erwenden Sie aussc hließlic h W ag en, Ständer , oder Tische, die speziell f ür professionell e Audi o- und Musikinstrumente geeignet sind. Achten Sie immer darauf, daß die jeweiligen Geräte sicher installiert sind, um Schäden und V erletzungen zu vermeiden . W enn Sie ein ...
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Alesis 12R - page 9
Important Safety Instructions CE Declaration Of Conformity See our website at: http://www .alesis .com FCC Compliance Statement This device complies with P art 15 of the FCC r ules. Operation is subject to the f ollowing tw o conditions: (1) This device ma y not cause har mful in terference and (2) this device must accep t any interference received ...
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Alesis 12R - page 10
1 20 50-60 HZ 5 23 W MAX High Frequency EQ Low Frequency EQ Aux Send 1 (Pre Fader) Aux Send 2 (Post Fader) FRONT P ANEL REAR P ANEL Gain Channel Pan/Balance Power In Power Switch Phantom Power Switch Main Out T ape Monitor In Stereo Aux Return Aux Sends Microphone In Channel Fader Main Out Monitor Out Line In Channel Insert Master Level Phantom Pow ...
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Alesis 12R - page 11
Introduction Multimix 12R Reference Manual 1 T ABLE OF C ONTENTS Table of Contents ................................................................. 1 Introduction ............................................................................. 3 The Alesis Multimix 12R Microphone Preamplifier/Mixer ........................ 3 Using this manual ....... ...
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Alesis 12R - page 12
Introduction Multimix 12R Reference Manual 1 T ABLE OF C ONTENTS Table of Contents ................................................................. 1 Introduction ............................................................................. 3 The Alesis Multimix 12R Microphone Preamplifier/Mixer ........................ 3 Using this manual ....... ...
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Alesis 12R - page 13
Introduction Multimix 12R Reference Manual 3 I NTRODUCTION 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 processing devices. As a b ...
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Alesis 12R - page 14
Introduction Multimix 12R Reference Manual 3 I NTRODUCTION 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 processing devices. As a b ...
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Alesis 12R - page 15
Installation Multimix 12R Reference Manual 5 I NSTALLATION Unpacking The Multimix 12R box should contain: 1. The mixer itself 2. A packet of literature along with this manual 3. An AC power cable AC power 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 ...
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Alesis 12R - page 16
Installation Multimix 12R Reference Manual 5 I NSTALLATION Unpacking The Multimix 12R box should contain: 1. The mixer itself 2. A packet of literature along with this manual 3. An AC power cable AC power 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 ...
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Alesis 12R - page 17
Connections Multimix 12R Reference Manual 7 C ONNECTIONS 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 speak ...
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Alesis 12R - page 18
Connections Multimix 12R Reference Manual 7 C ONNECTIONS 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 speak ...
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Alesis 12R - page 19
Connections Multimix 12R Reference Manual 9 Phantom power Certain types of microphones (called condenser microphones) require a DC power supply 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 to ...
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Alesis 12R - page 20
Connections Multimix 12R Reference Manual 9 Phantom power Certain types of microphones (called condenser microphones) require a DC power supply 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 to ...
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Alesis 12R - page 21
Connections Multimix 12R Reference Manual 11 Balanced +4 dBu line level sources: Professional recording and processing equipment typically provides a balanced, 3-conductor signal output that is a higher voltage (1.24 volts nominal level) than most synthesizers and stereo equipment. The Multimix 12R’s [LINE IN] jacks are designed to handle these b ...
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Alesis 12R - page 22
Connections Multimix 12R Reference Manual 11 Balanced +4 dBu line level sources: Professional recording and processing equipment typically provides a balanced, 3-conductor signal output that is a higher voltage (1.24 volts nominal level) than most synthesizers and stereo equipment. The Multimix 12R’s [LINE IN] jacks are designed to handle these b ...
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Alesis 12R - page 23
Connections Multimix 12R Reference Manual 13 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. 1. Plug the outputs of the phonograph pick ...
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Alesis 12R - page 24
Connections Multimix 12R Reference Manual 13 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. 1. Plug the outputs of the phonograph pick ...
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Alesis 12R - page 25
Connections Multimix 12R Reference Manual 15 You don’t need to connect anything to the other input of the effect, because most effect units use the stereo inputs only to provide a path for the “dry” stereo signal when the effect is connected directly between an instrument and an amplifier. In mixing applications such as with the Multimix 12R, ...
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Alesis 12R - page 26
Connections Multimix 12R Reference Manual 15 You don’t need to connect anything to the other input of the effect, because most effect units use the stereo inputs only to provide a path for the “dry” stereo signal when the effect is connected directly between an instrument and an amplifier. In mixing applications such as with the Multimix 12R, ...
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Alesis 12R - page 27
Connections Multimix 12R Reference Manual 17 providing a direct output. Or, put the recorder into INPUT mode and insert the plug all the way, connecting the input and output of each track of the recorder into each channel path of the mixer. This will allow playback monitoring of the recorder. See the Applications chapter for more information. For m ...
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Alesis 12R - page 28
Connections Multimix 12R Reference Manual 17 providing a direct output. Or, put the recorder into INPUT mode and insert the plug all the way, connecting the input and output of each track of the recorder into each channel path of the mixer. This will allow playback monitoring of the recorder. See the Applications chapter for more information. For m ...
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Alesis 12R - page 29
Connections Multimix 12R Reference Manual 19 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. Alternatively, you may simply connect the MAIN OUT or MONITOR OUT jacks o ...
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Alesis 12R - page 30
Connections Multimix 12R Reference Manual 19 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. Alternatively, you may simply connect the MAIN OUT or MONITOR OUT jacks o ...
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Alesis 12R - page 31
Connections Multimix 12R Reference Manual 21 2. Connect the stereo/TRS end to the INSERT jack of channel 1 of the Multimix 12R. 3. Connect the mono plug from the tip connector to the input of the ADAT. NOTE: the ADAT’s tracks are arranged from left to right on the back panel, and the mixer’s channels are from right to left, so the wires will ha ...
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Alesis 12R - page 32
Connections Multimix 12R Reference Manual 21 2. Connect the stereo/TRS end to the INSERT jack of channel 1 of the Multimix 12R. 3. Connect the mono plug from the tip connector to the input of the ADAT. NOTE: the ADAT’s tracks are arranged from left to right on the back panel, and the mixer’s channels are from right to left, so the wires will ha ...
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Alesis 12R - page 33
Connections Multimix 12R Reference Manual 23 Phones The [PHONES] jack on the front panel is designed for most stereo headphones. The internal headphone amplifier outputs the maximum power allowed by safety standards. The impedance and efficiency of the headphones will determine the maximum volume available. Eight- ohm headphones may be louder at a ...
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Alesis 12R - page 34
Connections Multimix 12R Reference Manual 23 Phones The [PHONES] jack on the front panel is designed for most stereo headphones. The internal headphone amplifier outputs the maximum power allowed by safety standards. The impedance and efficiency of the headphones will determine the maximum volume available. Eight- ohm headphones may be louder at a ...
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Alesis 12R - page 35
Operating Instructions Multimix 12R Reference Manual 25 O PERATING I NSTRUCTIONS Before turning the mixer on, "zero out' the controls 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 describ ...
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Alesis 12R - page 36
Operating Instructions Multimix 12R Reference Manual 25 O PERATING I NSTRUCTIONS Before turning the mixer on, "zero out' the controls 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 describ ...
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Alesis 12R - page 37
Operating Instructions Multimix 12R Reference Manual 27 Metering/Unity Gain method This method gives you more headroom than the peak method, while maintaining a low noise floor which will be well below the noise of most PA or live recording environments. 1. With the mic or line level signal flowing through the channel, set the TRIM to minimum. 2. S ...
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Alesis 12R - page 38
Operating Instructions Multimix 12R Reference Manual 27 Metering/Unity Gain method This method gives you more headroom than the peak method, while maintaining a low noise floor which will be well below the noise of most PA or live recording environments. 1. With the mic or line level signal flowing through the channel, set the TRIM to minimum. 2. S ...
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Alesis 12R - page 39
Operating Instructions Multimix 12R Reference Manual 29 Proper gain staging of other equipment The total noise performance of your system depends on proper gain control of all the elements. A "noisy mixer" is usually a quiet mixer in a system whose gain structure is incorrect. As a good starting point, set most volume level controls of ot ...
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Alesis 12R - page 40
Operating Instructions Multimix 12R Reference Manual 29 Proper gain staging of other equipment The total noise performance of your system depends on proper gain control of all the elements. A "noisy mixer" is usually a quiet mixer in a system whose gain structure is incorrect. As a good starting point, set most volume level controls of ot ...
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Alesis 12R - page 41
Operating Instructions Multimix 12R Reference Manual 31 By having the correct level at every point in the send/return chain, you avoid distortion by overloading and avoid noise. The most common mistake with effect units is to have too low a level at the send or input, then crank up the output of the processor or the Aux return to get the effects le ...
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Alesis 12R - page 42
Operating Instructions Multimix 12R Reference Manual 31 By having the correct level at every point in the send/return chain, you avoid distortion by overloading and avoid noise. The most common mistake with effect units is to have too low a level at the send or input, then crank up the output of the processor or the Aux return to get the effects le ...
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Alesis 12R - page 43
Operating Instructions Multimix 12R Reference Manual 33 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. Noise is present in every system, analog or digit ...
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Alesis 12R - page 44
Operating Instructions Multimix 12R Reference Manual 33 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. Noise is present in every system, analog or digit ...
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Alesis 12R - page 45
Operating Instructions Multimix 12R Reference Manual 35 rack from being conducted back to the mixer. 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. Operating Instructions ...
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Alesis 12R - page 46
Operating Instructions Multimix 12R Reference Manual 35 rack from being conducted back to the mixer. 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. Operating Instructions ...
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Alesis 12R - page 47
Applications Multimix 12R Reference Manual 37 A PPLICATIONS 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 ...
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Alesis 12R - page 48
Applications Multimix 12R Reference Manual 37 A PPLICATIONS 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 ...
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Alesis 12R - page 49
Applications Multimix 12R Reference Manual 39 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 ...
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Alesis 12R - page 50
Applications Multimix 12R Reference Manual 39 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 ...
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Alesis 12R - page 51
Specifications Multimix 12R Reference Manual 41 T ROUBLESHOOTING 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 Cause Solution The Power LED does not light when th ...
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Alesis 12R - page 52
Specifications Multimix 12R Reference Manual 41 T ROUBLESHOOTING 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 Cause Solution The Power LED does not light when th ...
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Alesis 12R - page 53
Specifications Multimix 12R Reference Manual 43 Maintenance/Service Exterior cleaning Disconnect the AC cord, then use a damp cloth to clean the mixer’s metal and plastic surfaces. For heavy dirt, use a non-abrasive household cleaner such as Formula 409 or Fantastik. DO NOT SPRAY THE CLEANER DIRECTLY ONTO THE FRONT OF THE UNIT AS IT MAY DESTROY T ...
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Alesis 12R - page 54
Specifications Multimix 12R Reference Manual 45 S PECIFICATIONS All measurements taken with an Audio Precision System One. All noise measurements taken with trim at minimum and faders at unity gain with 22 Hz to 22 kHz bandwidth unless otherwise specified. All In & Out measurements made on balanced +4 dBu connectors. (+4 dBu into a line input w ...
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Alesis 12R - page 55
Specifications Multimix 12R Reference Manual 45 S PECIFICATIONS All measurements taken with an Audio Precision System One. All noise measurements taken with trim at minimum and faders at unity gain with 22 Hz to 22 kHz bandwidth unless otherwise specified. All In & Out measurements made on balanced +4 dBu connectors. (+4 dBu into a line input w ...
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Alesis 12R - page 56
Specifications Multimix 12R Reference Manual 47 Noise performance (typical) Measured at MAIN OUT +4 dBu jacks, unbalanced load, 22 Hz to 22 kHz, all channels panned to center. MIC IN to INSERT OUT: -128.5 dBu Equivalent Input Noise at maximum gain Residual output noise (MASTER fader at nominal, channel faders at minimum): <-88 dBu 12 inputs, fad ...
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Alesis 12R - page 57
Specifications Multimix 12R Reference Manual 47 Noise performance (typical) Measured at MAIN OUT +4 dBu jacks, unbalanced load, 22 Hz to 22 kHz, all channels panned to center. MIC IN to INSERT OUT: -128.5 dBu Equivalent Input Noise at maximum gain Residual output noise (MASTER fader at nominal, channel faders at minimum): <-88 dBu 12 inputs, fad ...
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Alesis 12R - page 58
Specifications Multimix 12R Reference Manual 49 B LOCK DIAGRAM Specifications Level diagram ...
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Alesis 12R - page 59
Specifications Multimix 12R Reference Manual 49 B LOCK DIAGRAM Specifications Level diagram ...
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Alesis 12R - page 60
Index Multimix 12R Reference Manual 51 I NDEX ADAT, 18, 22, 34, 39 amplifier, 20, 31 Aux 1, 17, 20 AUX 2, 16, 32 AUX SEND, 16, 20 balanced, 12, 20 cable , 9 clipping, 13 compressor, 17 direct output using INSERT jack, 18 distortion, 28, 31 effect, 16 EQ, 31 Fader, 30 feedback, 20, 21 gain, 30 ground loop, 35 isolating from rack, 8 grounding, 6, 7 g ...
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Alesis 12R - page 61
Warranty / Contact Alesis Limited W arranty ALESIS CORPORATION ("ALESIS") w ar rants this product to be free of defects in material and workmanship fo r a period of one (1) year for parts and for a period of one (1) year for labor from the date of or iginal retail purchase. This warranty is enforceable only by the original retail purcha s ...
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Alesis 12R - page 62
Alesis Cont act Information Alesis Distributi on, LLC Los Angeles , CA USA E-mail: support@alesis .com We b s i t e : http://www .alesis .com Alesis Multimix 12R Reference Man ual Revision 1.0 by Brooks Br uner Copyright 2002, Alesis Distribution, LLC. All rights reser ved Reproduc tion in whole or in part is prohibited. “Multi mix 12R” is a tr ...
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