Alesis 1622 User Manual
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ALESIS

1622 Mixer

Reference Manual

TABLE OF CONTENTS

 

INTRODUCTION....................................................................................................................

2

WHAT IS A MIXING CONSOLE?...............................................................................

2

FEATURES................................................................................................................

2

SECTION 1

 

DESCRIPTION OF CONTROLS ................................................................................

3

TOP PANEL ..................................................................................................

3

INPUT TRIM .....................................................................................

3

EQ ....................................................................................................

3

SENDS .............................................................................................

3

PRE-FADERSENDS............................................................

3

POST-FADERSENDS .........................................................

4

MASTER ASSIGN SWITCH .............................................................

5

SUB MASTER ASSIGN SWITCH .....................................................

5

MUTE SWITCH ................................................................................

6

SOLO SWITCH.................................................................................

6

PAN POT..........................................................................................

6

CHANNEL FADER............................................................................

6

SEND MASTERS..............................................................................

6

TAPE/MONITOR SWITCH................................................................

6

MONITOR VOLUME .........................................................................

6

EFFECTS RETURNS .......................................................................

6

SUB MASTER FADERS ...................................................................

7

SUB MASTER TO MASTER ASSIGN SWITCH................................

7

MASTER FADERS............................................................................

7

BACK PANEL................................................................................................

7

MIC/LINE INPUTS ............................................................................

7

MICROPHONE INPUTS ...................................................................

7

DIRECT OUTPUTS...........................................................................

7

CHANNEL INSERTS.........................................................................

8

SENDS .............................................................................................

8

RETURNS ........................................................................................

8

HEADPHONE ...................................................................................

8

SUB OUT..........................................................................................

8

SUB INSERT ....................................................................................

8

MAIN OUT ........................................................................................

8

MAIN OUT LEVEL SELECTOR ........................................................

8

MAIN INSERT...................................................................................

8

MONITOR OUT ................................................................................

8

POWER SUPPLY CONNECTOR......................................................

8

ON/OFF SWITCH .............................................................................

9

SIGNAL FLOW IN THE 1622 .....................................................................................

9

SECTION 2

 

SETTING UP THE 1622 ............................................................................................

12

CONNECTIONS TO THE MIXER ..................................................................

12

INTERFACING TO A MULTITRACK TAPE RECORDER:

 

4 TRACK THROUGH 8 TRACK RECORDING .....................

12

INTERFACING TO THE MULTITRACK TAPE RECORDER VIA A

 

PATCHBAY ......................................................................................

13

INTERFACING THE 1622 MIXER TO THE MIXDOWN DECK..........

14

INTERFACING THE 1622 MIXER TO THE CONTROL ROOM

 

MONITOR SPEAKERS.....................................................................

15

INTERFACING THE 1622 MIXER TO A HEADPHONE AMP ............

15

INTERFACING THE SENDS AND RETURNS OF THE 1622 MIXER TO

EFFECTS .........................................................................................

15

INSERT INTERFACING....................................................................

15

HOW TO ADJUST LEVELS ..........................................................................

16

SECTION 3

APPLICATIONS ........................................................................................................

18

MULTITRACK RECORDING .........................................................................

18

INTRODUCTION TO MULTITRACK RECORDING...........................

18

RECORDING .......................................................................

18

MONITORING ......................................................................

19

MULTITRACK MIX...................................................

19

MONITOR SPEAKER (CONTROL ROOM) MIX.......

19

CUE MIX..................................................................

19

MIXDOWN ...........................................................................

19

THE 1622 MIXER AND A 4 OR 8 TRACK TAPE DECK.................................

19

USING THE 1622 MIXER TO RECORD

 

A SINGLE SOURCE TO 1 TRACK .......................................

20

TWO OR MORE SOURCES TO 1 TRACK...........................

20

2 OR MORE SOURCES TO 2 TRACKS...............................

20

RECORDING TIPS ...........................................................................

21

HOW TO PLAYBACK FROM MULTITRACK.....................................

21

HOW TO SET UP A CUE .................................................................

22

MIXDOWN........................................................................................

22

HOW TO CREATE A DEPENDABLE MIX........................................

23

HOW TO GROUP SEVERAL CHANNELS TOGETHER

 

WHEN MIXING .................................................................................

25

HOW TO PLAYBACK A MIX FROM THE MIXDOWN TAPE DECK ..

26

PLAYBACK TIPS..................................................................

26

SOUND REINFORCEMENT APPLICATIONS IN MONO ..................

27

USING THE SUB MASTERS ............................................................

28

LINE INPUTS USED AS ADDITIONAL MIC INPUTS ........................

29

USING THE SUB MASTERS FOR SEPARATE OUTPUTS ..............

29

STAGE MONITOR MIX FROM THE PRE-FADERSENDS ...............

30

DEDICATED MIDI KEYBOARD MIXER.........................................................

30

SECTION 4

TROUBLESHOOTING ..............................................................................................

32

NO SOUND ...................................................................................................

32

NO SOUND WHEN CHANNEL IS SOLOED .....................................

32

NO SOUND WHEN MONITOR LEVEL TURNED UP........................

32

OVERLOAD PROBLEMS ..............................................................................

32

DISTORTION HEARD WHEN INPUT CHANNEL IS SOLOED..........

32

DISTORTION IS BEING RECORDED ONTO TAPE, BUT DISTORTION

NOT HEARD WHEN INPUT CHANNEL IS SOLOED........................

33

DISTORTION AT MIXDOWN MACHINE OR SOUND SYSTEM .......

33

DISTORTION ON THE RETURNS....................................................

33

SECTION 5

GROUNDING.............................................................................................................

33

SECTION 6

 

SPECIFICATIONS .................................................................................................................

35

GLOSSARY ...........................................................................................................................

36

APPENDIX .............................................................................................................................

42

INDEX ....................................................................................................................................

44

BLOCK DIAGRAM................................................................................

45

Alesis 1622

Monolithic/Integrated Surface™ Audio Console

USER'S MANUAL

Alesis 1622

Monolithic/Integrated Surface™ Audio Console

INTRODUCTION

The Alesis 1622 Monolithic/Integrated Surface™Audio Console is a 16 channel, two buss audio mixing console which features the new Integrated Monolithic Surface™technology. This technology makes available a number of features at low cost which previously could only be found in much more expensive consoles .

The 1622 MIXER provides excellent sonic qualities, with extremely low noise and crosstalk, flat wideband frequency response, and the superb sweet sound normally associated with consoles costing many times more. Thus the1622 MIXER can be used as an additional "Musical Tool" .

Because of the built-inflexibility of the1622 MIXER, the unit is at home in any application, be it recording, sound reinforcement,post-production,or as a dedicated keyboard mixer.

WHAT IS A MIXING CONSOLE?

As the name implies, a mixing console "mixes" audio signals together from various sources (microphones, keyboards, tape machines, reverbs, etc.). But unlike a simple "mixer", a mixing console is really the "brain" or center of the entire sound system, regardless of the application, since it not only mixes the signals together, but also provides routing of these signals to tape recorders, effects devices, and other audio systems. The console also allows for adjustment of monitoring levels independent of recording levels.

FEATURES

16 INPUT CHANNELS WITH EQ - Plenty of inputs for keyboards, microphones, or effects

6 AUXILIARY SENDS - Sends signal to up to 6 outboard effects devices, or 4 outboard effects devices and 2 mono or 1 stereo headphone cue mixes

8 AUXILIARY RETURNS - Special dedicated inputs designed to blend the returns of any combination of 8 mono or 4 stereo outboard effects devices

SOLO FUNCTION ON INPUT CHANNELS - Enables any overloads or unwanted background noise to be easily detected

2 SUB MASTERS - Makes it easy to control several input channels with just one fader (or two for stereo), or control record levels during multitrack recording

CONTROL ROOM MONITOR SECTION - Sets a level for the control room monitor speakers that is independent of the main mix

ELECTRONICALLY BALANCED MIC INPUTS - A feature normally found on consoles that are many times more expensive, this allows for both lower noise and greater headroom in the most critical stage of the console

MIXDOWN TAPE DECK RETURN - Allows you to hear playback of your mix from the stereo mixdown tape machine just by flipping a switch

INSERTS ON ALL INPUTS AND OUTPUTS - Allows for patching outboard signal processing devices such as EQ's, compressors, and effects directly into the signal path

8 DIRECT OUTPUTS - Allows for the quietest operation by bypassing unused electronics and sending the channel signal directly to the input of a Multitrack Tape Machine

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3

SECTION 1

DESCRIPTION OF CONTROLS

TOP PANEL

INPUT TRIM

The INPUT TRIM is a variable gain control that allows the preamp stage of the mixer to boost the level of a mic or line level signal being fed into the input. The input section of any mixer is the most critical due to the high gain required to amplify such a low level signal (such as that of a microphone) to a usable level. If the gain is set too high, a hot signal from a synthesizer or loud vocalist will cause the input stage to overload and distort. If the gain is set too low, additional gain must be added at some other point in the mixer (such as the faders) which could cause excessive background noise at the output.

EQ

The equalizer, or EQ, section consists of simple bass and treble controls similar to that of a guitar amp or home stereo. EQ allows for any tonal shaping that might be required by a signal. For the technically minded, these are known as shelving equalizers and have turnover points at 10KHz and 100Hz. This means that the maximum boost or cut begins from 10KHz (and 100Hz for the low frequency EQ) and maintains this "shelf" or plateau from 10KHz to 20KHz. The frequencies below 10KHz are also affected, but less and less so as the frequency of the signal gets further away from 10KHz. See Figure 1

FIGURE 1

HI AND LO SHELVING EQ OF THE 1622 MIXER

 

SHELF

 

100Hz

10KHz

+15dB

+15dB

0 dB

0 dB

-15dB

-15dB

Frequency

 

SENDS

SENDS (sometimes called "Auxiliary Sends" or "Aux's") are adjustable feeds from the input channel that are used to send part of the signal to an outboard effect, like a reverb, delay, or chorus, or to set up a separate cue (headphone) mix for musicians headphones during recording and overdubbing. There are two different types of SENDS included in the 1622. These are:

PRE-FADERSENDS

SENDS 1 and 2 are derived from the signal path before the Channel Fader. This means that movements of the channel fader will have no effect on the amount of signal being sent to any equipment connected to these SENDS. For this reason, these auxiliary sends are normally used as cue sends (sends to headphones while recording) because any movement of the channel

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faders will not upset the headphone balance. Pre-FaderSENDS can also be used to send a signal to outboard effects as well.See Figure 2A and 2B

FIGURE 2A

PRE-FADERSEND LEVEL FROM THE1622 MIXER TO EFFECTS DEVICE WITH CHANNEL FADER UP

 

PRE-FADERSEND

INPUT

SIGNAL

FADER UP

MASTER

 

FIGURE 2B

PRE-FADERSEND LEVEL FROM THE1622 TO EFFECTS DEVICE WITH CHANNEL FADER

 

B. PRE-FADERSEND

 

WITH

INSTRUMENT/MIC

CHANNEL FADER DOWN

 

PRE-FADERSEND

 

EFFECTS DEVICE

 

TO HEADPHONES

 

OR EFFECTS

 

INPUT

 

LED METER

CHANNEL

+3

0VU

FADER

-10

 

 

-20

 

-30

 

-40

 

-50

 

-60

POST-FADERSENDS

SENDS 3 through 6 are derived from the signal path after the Channel Fader which means that their levels will be changed in direct relationship to the Channel Fader level. This means that when the Channel Fader is either increased or decreased, the send level will also be increased or decreased and the effects (or headphones) would get louder or softer. Since this wouldn't be too great for a headphone balance, these Post-Fadersends are normally used to send to outboard effects devices such as reverbs. Unlike most other mixers which may have only 1 or 2Post-FaderSends, the1622 MIXER has a total of 4Post-FaderSends.See Figure 3A and 3B

FIGURE 3A

POST-FADERSEND LEVEL FROM THE1622 MIXER TO EFFECTS DEVICE WITH CHANNEL FADER UP

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A. POST-FADERSEND

INSTRUMENT/MIC

WITH

 

CHANNEL FADER UP

 

INPUT

 

LED METER

 

+3

 

0VU

CHANNEL

-10

-20

FADER

-30

 

 

-40

 

-50

 

-60

POST-FADERSEND

 

EFFECTS DEVICE

 

TO HEADPHONES

 

OR EFFECTS

FIGURE 3B

POST-FADERSEND LEVEL FROM THE1622 MIXER TO EFFECTS DEVICE WITH CHANNEL FADER DOWN

 

B. POST-FADERSEND

INSTRUMENT/MIC

WITH

 

CHANNEL FADER DOWN

 

INPUT

 

LED METER

 

+3

 

0VU

CHANNEL

-10

-20

FADER

-30

 

 

-40

 

-50

 

-60

POST-FADERSEND

 

EFFECTS DEVICE

 

TO HEADPHONES

 

OR EFFECTS

MASTER ASSIGN SWITCH

Routes the channel signal directly to the MASTER Stereo Buss.

SUB MASTER ASSIGN SWITCH

Routes the channel signal directly to the SUB MASTER.

MUTE SWITCH

Turns the channel off. The MUTE switch does not affect the signal on SENDS1 and 2 but will mute SENDS 3 through 6.

SOLO SWITCH

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SOLO disconnects the normal signal feed to the monitor speakers and replaces it with the signal present at the Channel Fader. When a channel is soloed, the signal will be heard in mono regardless of the position of the pan pot, and without any effects via the Sends and Returns.

Soloing enables the engineer to hear exactly what is being recorded by eliminating the masking effects caused by the presence of other signals. When soloed, distortion caused by overloading or other undesired background noises in an input channel can be heard easily.

SOLO switches can be used at any time without interrupting the signals sent to the headphones or recorded on tape since the soloed signal is only heard through the Monitor Speakers. By engaging additional SOLO switches, as many signals as desired can be soloed simultaneously.

PAN POT

The PAN POT places the signal of the channel anywhere in the stereo field between the left and right channels of the MASTER or SUB MASTERS (or both) depending upon which is assigned. If the PAN is set all the way to the left, the signal will appear only on the left SUB MASTER or MASTER fader. If the PAN is set all the way to the right, the signal will appear only on the right SUB MASTER or MASTER fader.

CHANNEL FADER

The CHANNEL FADER determines the overall volume level of the channel. It is normally best to keep this FADER at about the 3/4 level for the most headroom and least background noise.

SEND MASTERS 1 through 6

This is the overall master for the corresponding SEND of each channel. Therefore, if the level of SEND 1 was too hot and causing distortion, the overall level could be trimmed by adjusting SEND MASTER 1, which would lower the signal without having to individually adjust each channel SEND.

TAPE/MONITOR SWITCH

When the 1622 MIXER is used for recording, this switch will determine what you hear in the control room monitor speakers. When in the TAPE position, the signal from the Mixdown Tape Deck will be heard and can be adjusted from the MONITOR VOLUME pot. When in the MONITOR position, the signal from the console, as adjusted by the MASTER Faders and MONITOR VOLUME pot, will be heard.

MONITOR DEFEAT SWITCH

This switch will mute the signal going to the control room monitor speakers in the event that it is necessary to monitor with headphones via the headphone jack. This switch has no effect on the signals appearing at the MASTER Faders.

MONITOR VOLUME

The MONITOR VOLUME Control adjusts the volume level of the control room monitor speakers only. When the 1622 is used as a recording console, it is necessary to be able to control the level of the control room monitor speakers and the MASTER Fader output levels independently. Without the separate MONITOR VOLUME control, both the control room speakers and the mixdown tape level would be controlled by the MASTER Faders, which would cause either a distorted or noisy signal going to tape when the speaker levels were correct, or too loud or soft speaker levels when the tape machine levels were correct.

EFFECTS RETURNS

The EFFECTS RETURNS are additional inputs (besides the 16 Channel Inputs) especially for outboard effects such as reverbs, delays, chorus, etc. These inputs eliminate the need to connect effects to channel inputs and, therefore, keep the input channels available for additional microphones, synthesizers, etc.

There are 8 EFFECTS RETURNS on the 1622 MIXER . RETURNS 1 through 4 each have a PAN control which allows the the return signal to be placed anywhere in the stereo spectrum from left to right. RETURNS 5 and 7 are permanently assigned to the Left MASTER Buss, and RETURNS 6 and 8 are permanently assigned to the Right MASTER Buss.

SUB MASTER FADERS

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The SUB MASTER Faders can serve several different functions, depending upon the application. In sound reinforcement or in recording during mixdown, the SUB MASTER Faders will act as a group master for a number of input channels. For instance, if Input Channels 1 through 8 contained drum mics, and you wanted to control the overall level of the drums with just one fader, this could be achieved by assigning input channels 1 through 8 to the SUB MASTER ASSIGN, and then panning each channel either hard left or hard right (for mono). The SUB MASTERS could also be assigned in stereo by panning the input channels to any point in the stereo spectrum, in which case the composite signal will appear on both the right and left SUB MASTER faders. See Section 3.

During recording, the SUB MASTERS can be used to mix several signals together onto a single track (or two tracks for stereo) by assigning those input channels to the SUB MASTERS and connecting the SUB OUT jack to the track that you wish to record on. See Section 3.

SUB MASTER TO MASTER ASSIGN SWITCH

This switch routes the signal on the SUB MASTERS to the MASTER Faders.

MASTER FADERS

The Left and Right MASTER Faders control the main output of the console to either the mixdown deck (in recording) or the sound system (in sound reinforcement).

MAIN STEREO METERS

The main STEREO METERS, each consisting of 7 green, 4 yellow, and 4 red LEDs, show the relative output levels of the MASTER Faders. The METERS will also show the level of any input channel that has its SOLO engaged.

SOLO/POWER LEDS

The SOLO LED lights whenever a solo is switched on. The POWER LED lights whenever AC power is connected to the unit.

BACK PANEL

MIC/LINE INPUTS

Channels 1 through 16 can be accessed via a 1/4" phone jack. Normally, this would be used for line level signals such as synthesizers or tape machines but it is also possible to feed a microphone signal into this jack. In 4 or 8 track recording applications, channels 9 through 16 would normally be used for tape returns of tracks 1 through 8, while channels 1 through 8 would be used for mic or instrument inputs.

MICROPHONE INPUTS

Channels 1 through 8 contain an XLR jack which provides an electronically balanced input ideally suited for a microphone. This input is overridden should a plug be inserted in the corresponding Input phone jack (XLR #1 is defeated if a phone plug is inserted in phone jack #1).

DIRECT OUTPUTS

Channels 1 through 8 contain a DIRECT OUTPUT jack. Each channel routes its own input signal, after it has been amplified and EQ'd, to the Direct Output jack. This is generally used to feed a single track of a Multitrack Tape Deck. Because the Direct Output is the path with the least amount of circuitry and therefore the lowest possible background noise, it is most desirable to use when recording the signal of only a single channel.

CHANNEL INSERTS

Channels 1 through 16 each contain a stereo jack called an INSERT. This consists of an insert send (the tip of a stereo phone plug) and insert return (the ring of a stereo phone plug) and is used to insert an outboard effects device, such as a compressor, EQ, or chorus, directly into the

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signal path of only that channel. A special cable consisting of a single stereo 1/4" jack on one end and two mono 1/4" jacks on the other is required. See Section 2 - INSERT INTERFACING

SENDS

These jacks feed the signal from SEND MASTER 1 through 6 to an outboard effects device or headphone amplifier. SENDS 1 and 2 are derived Pre-Faderwhile SENDS 3 through 6 are derivedPost-Fader.

RETURNS

The RETURN jacks are especially dedicated to the signals returning from any outboard effects devices back into the 1622 MIXER. RETURNS 1 through 4 are pannable between the Left and Right MASTER buss. RETURNS 5 and 7 are permanently assigned to the Left MASTER. RETURNS 6 and 8 are permanently assigned to the Right MASTER.

HEADPHONE

Controlled from the MONITOR VOLUME pot, the HEADPHONE jack provides substantial level to drive most headphones. It is not affected by the MONITOR DEFEAT switch.

SUB OUT

The outputs of the SUB MASTERS are available for connection to the inputs of a tape machine. In certain applications, such as video post production, the SUB OUTS may also have a different mix, such as a mix containing music and effects but minus the dialog, from the one available at the MAIN OUTPUTS.

SUB INSERT

A ring-tip-sleevejack that allows insertion of an outboard effects device, such as a compressor like theAlesis MICRO LIMITER or reverb like aMICROVERB II, into the signal path of the SUB MASTER.

MAIN OUT

The outputs of the MAIN OUT are available for connection to the inputs of a Mixdown Tape Machine, sound system, or amplifier.

MAIN OUT LEVEL SELECTOR

This switch selects the proper level for use with either professional or semi-professionalequipment. Select the +4dBV position (switch pressed in) for most sound systems and professional tape machines. Select the-10dBVposition (switch out) for connection to guitar amplifiers or cassette decks. Generally speaking, use the-10dBVsetting if you are connecting to a device that uses RCA jacks. Use the +4dBV setting for a device that uses XLR inputs. For a device that uses 1/4" phone jacks, try both settings and choose the one with the lowest background noise (hiss and hum).

MAIN INSERT

Allows for the insertion of an outboard effects device, such as the Alesis MICRO LIMITER or theAlesis QUADRAVERB, into the signal path of the MAIN Outputs.

MONITOR OUT

The outputs of the MONITOR OUT are available for connection to the inputs of the amplifier for the control room monitor speakers. The level is controlled by the MONITOR VOLUME pot.

TAPE INPUT

For connection of the output of a mixdown deck during recording. This will allow you to hear the playback of your mix without repatching.

POWER SUPPLY CONNECTOR

Connection for Alesis 1622 power supply.

9