SSM-1750 4-Channel Stereo Audio Mixer
(320-3008) Operation Faxback Doc. # 45073
Turning On The Mixer
1. Set the volume levels on the output devices (receiver/amplifier and
tape deck) to minimum and turn them on.
2. Press POWER to turn on the mixer. The POWER indicator lights.
3. Turn on the input sources you want to mix.
4. Using the mixer requires two basic operations:
Presetting the input signal levels (see "Presetting the Input Signal
Levels" below).
Mixing the audio input sources (see "Mixing the Inputs" below).
5. After you finish mixing, turn down the volume on the output audio
devices, turn off the input and output audio devices (amplifiers, tape
decks, and so on), then press POWER so it pops up to turn off the mixer.
The POWER indicator turns off.
Presetting The Input Signal Levels
Before you mix any inputs, you must preset the signal level for each source
(up to twelve sources).
Before You Begin
To avoid accidentally overdriving a channel or prematurely mixing in an
audio input source, make sure you start with the following settings:
All volume slide controls set to 0.
Both ASSIGN switches (A and B) set to OFF.
All GAIN knobs set midway.
All HIGH, MID, and BASS controls, CUE LEVEL, DJ MIC LEVEL, AUX LEVEL,
SEND, RECEIVE, and MASTER set to 0.
Rotate MASTER Clockwise and temporarily set it to about the 5th marker.
NOTE: The MASTER volume control adjusts the overall volume of DJ MIC, AUX,
CH1, CH2, CH3, CH4, RECEIVE input and sound effects.
The mixer uses two volume unit (VU) meters to indicate the total stereo
output signal level. For the best results, each input signal level should
normally be set so the VU meters never move into the red range (0 or above).
Distortion is likely to occur on audio peaks if the meter moves into the
red range.
For monaural output, set MONO/STEREO to MONO. For stereo output, set it to
STEREO.
Presetting the Channel Inputs
Follow these steps to preset each channel input you plan to mix.
NOTES: If you did not connect an input source to every jack or do not want
to mix every input source connected to the mixer's input jacks, you
do not need to preset every channel input. Decide which source(s)
you want to preset and mix, then preset those inputs only.
While you adjust the input signal levels for channels 1, 2, 3 and 4,
either use the headphones or turn up the receiver/amplifier's volume
to a comfortable listening level (not necessarily the final usable
level).
Do not play a quiet portion of music while you adjust the volume
levels, otherwise the volume levels for channels 1, 2, 3 and 4 will
be overdriven during the loud portions of the music.
1. Set the channel selector to the desired input source.
2. Start playback of the selected input source.
3. Adjust the HIGH, MID and BASS controls as desired. See "Using the TONE
Controls" on Faxback Doc. # 45074.
NOTE: If you are using an external equalizer, leave the tone controls
set to 0 and adjust the tone on the external equalizer.
4. Slowly slide up the channel volume control until you get a reading of
up to 0 on both VU meters.
IMPORTANT: Write down or remember the channel volume level slide
control's setting for the selected audio source, so each
time you want to mix that source you can slide the volume
control to the correct setting.
NOTES: If it was necessary to set the channel volume level slide con-
trol all the way to 10 in order to get a reading of up to 0 on
the VU meter, then slide it down to about 8 and adjust the GAIN
control to get a reading of up to 0 on the VU meters.(See "Using
Gain" on Faxback Doc. # 45074).
If that does not work, set GAIN midway and rotate MASTER clock-
wise until you get a reading of 0 on the VU meters.
If you have to readjust MASTER, remember that this affects the
level of the previously set input sources. You must readjust
those sources until you get a reading of up to 0 on the VU
meters for each.
5. Stop playback of the selected input source.
6. Repeat these steps for each channel input you plan to mix.
Presetting The Microphone
For an XLR Microphone:
1. If your XLR microphone has an ON/OFF control, set it to ON.
2. While talking continuously, adjust DJ MIC LEVEL until you get a reading
of up to 0 on both VU meters. (See "Using an XLR Microphone" on Faxback
Doc. # 45074.
IMPORTANT: Write down or remember the DJ MIC LEVEL setting so each time
you want to mix the microphone you can set the control to
the correct setting.
NOTES: If it was necessary to turn DJ MIC LEVEL all the way to 10 in
order to get a reading of up to 0 on the VU meter, then turn it
down about two marks and adjust the DJ MIC GAIN control to get a
reading of up to 0 on the VU meters.(See "Using Gain" on Faxback
Doc. # 45074).
If that does not work, set DJ MIC GAIN midway and rotate MASTER
clockwise until you get a reading of 0 on the VU meters.
If you have to readjust MASTER, remember that this affects the
level of the previously set input sources. You must readjust
those sources until you get a reading of up to 0 on the VU meters
for each.
3. If you XLR microphone has an ON/OFF control, set it to OFF.
If your XLR microphone does not have an ON/OFF control, set DJ MIC LEVEL
to 0.
For an Auxiliary Microphone:
1. If your auxiliary microphone has an ON/OFF control, set it to ON.
2. While talking continuously, adjust AUX LEVEL until you get a reading of
up to 0 on both VU meters. (See "Using the AUX Microphone" on Faxback
Doc. # 45074).
IMPORTANT: Write down or remember the AUX LEVEL setting so each time you
want to mix the microphone you can set the control to the
correct setting.
NOTES: If it was necessary to turn AUX LEVEL all the way to 10 in order
to get a reading of up to 0 on the VU meter, then turn it down
about two marks and adjust the AUX GAIN control to get a reading
of up to 0 on the VU meters. (See "Using Gain" on Faxback Doc.
# 45074).
If that does not work, set AUX GAIN midway and rotate MASTER
clockwise until you get a reading of 0 on the VU meters.
If you have to readjust MASTER, remember that this affects the
level of the previously set input sources. You must readjust
those sources until you get a reading of up to 0 on the VU meters
for each.
3. If your auxiliary microphone has an ON/OFF control, set it to OFF.
If your auxiliary microphone does not have an ON/OFF control, set AUX
LEVEL to 0.
Presetting the Auxiliary Input
1. To preset the AUX LINE input source, set AUX to LINE.
2. Start playback of the selected input source.
3. Adjust the HIGH, MID and BASS controls as desired. See "Using the Tone
Controls" on Faxback Doc. # 45074.
NOTE: If you are using an external equalizer, leave the tone controls
set to 0 and adjust the tone on the external equalizer.
4. Slowly adjust AUX LEVEL until you get a reading of up to 0 on both VU
meters.
IMPORTANT: Write down or remember the AUX LEVEL setting so each time
you want to mix that source you can set the control to the
correct setting.
NOTES: If it was necessary to set the AUX LEVEL control all the way to
10 in order to get a reading of up to 0 on the VU meter, then set
AUX LEVEL down to about 6 and adjust the AUX GAIN Control to get
a reading of up to 0 on the VU meters. (See "Using Gain" on
Faxback Doc. # 45074.)
If that does not work, set AUX GAIN midway and rotate MASTER
clockwise until you get a reading of 0 on the VU meters.
If you have to readjust MASTER, remember that this affects the
level of the previously set input sources. You must readjust
those sources until you get a reading of up to 0 on the VU meters
for each.
5. Stop playback of the selected input source.
Mining The Inputs
You can connect input signals from up to 12 audio sources, select any two
of the channel input sources, then mix them so only one or both play
through your sound system.
Mixing requires three operations:
Playing one input source.
Monitoring the next input source.
Switching to the next input source.
You can start with either of the two selected sources.
To prevent prematurely mixing audio sources, set all volume level controls
to 0.
To avoid sudden and unusable sound outputs from any audio devices that you
connect to the mixer, be sure to set their power controls to off (and any
tone controls to flat).
Playing One Input Source
1. Set ASSIGN A to the desired source, then set CROSS FADER to A.
2. Select the mixer's input - CH 1, CH 2, CH 3 or CH 4.
3. Set the input selector control to the input source you want to play
first through your sound system.
4. Adjust the receiver's or amplifier's (not the mixer's) volume control
to the desired volume.
Make sure the first input source's volume level slide control is set to
the correct preset position.
5. Start playback of the input source.
Monitoring a Second Input Source
Monitoring a second input source's signal level requires selecting the input
source that is not currently playing, finding the desired section you want
to mix, then adjusting the source's sound level so it matches the volume
level of the source currently playing.
1. Connect and put on headphones.
NOTE: You can listen to one channel through the headphones while the
other channel is playing through the sound system.
2. Set ASSIGN B to the second input source.
3. Set CUE ASSIGN to the audio input source (CH 1, CH 2, CH 3 or CH 4) you
want to monitor.
4. Set the desired channel volume level slide control to the preset posi-
tion.
5. Adjust CUE LEVEL to a comfortable listening level.
6. Start playback of the input source you want to play next through your
sound system.
7. Set the input device to the desired section of music, then stop or
pause the input device.
Switching to the Second Input Source
1. Start playback of the second input source.
2. When you are ready to play its sound through your sound system, slide
CROSS FADER from A to B.
Slide CROSS FADER:
To the left to fade in the channel selected by ASSIGN A and fade out the
channel selected by ASSIGN B.
To the right to fade in the channel selected by ASSIGN B and fade out the
channel selected by ASSIGN A.
To the center to equally mix the two.
NOTES on Mixing:
If you set CROSS FADER to A to play the channel selected by ASSIGN A, then
you must set CUE ASSIGN to CH 1 to monitor CH 1, to CH 2 to monitor CH 2,
to CH 3 to monitor CH 3, and to CH 4 to monitor CH 4. The same applies when
you set CROSS FADER to B.
To mix any two inputs selected by the ASSIGN switches, set each ASSIGN
switch to the desired channel. Then use CROSS FADER to mix the two.
Do not slide CROSS FADER to the center if you want to monitor one channel
while the other is playing. Otherwise, the sound from the channel you
monitor will also be heard through your sound system. Instead, slide CROSS
FADER to the channel you are not monitoring. For example, to monitor
channel 1 (selected by ASSIGN A) while channel 2 (selected by ASSIGN B) is
playing slide CROSS FADER to B.
Use CUE LEVEL to listen to the input controlled by the CUE ASSIGN switch
and what is playing on the currently selected output device.
(br/EB 11/3/97)
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