Optimus Music Mixer 32 3009 User Manual

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Cat. No. 32-3009  
OWNER’S MANUAL  
Please read before using this equipment.  
SSM-1250  
3-Channel Stereo Audio Mixer  
 
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CONTENTS  
Features ................................................................................................................ 4  
Preparation ........................................................................................................... 6  
Connecting the Outputs .................................................................................. 6  
Connecting the Inputs ..................................................................................... 6  
Connecting Power ........................................................................................... 8  
Connecting a Lamp ......................................................................................... 8  
Connecting Headphones ................................................................................ 9  
Listening Safely ........................................................................................ 9  
Operation ............................................................................................................ 10  
Presetting the Input Signal Levels ................................................................ 10  
Presetting the Microphone ...................................................................... 11  
Presetting the Channel 1/2/3 Input Sources ........................................... 11  
Checking the Sound ............................................................................... 14  
Mixing the Inputs ........................................................................................... 15  
Playing One Input Source ....................................................................... 15  
Monitoring a Second Input Source ......................................................... 15  
Switching to the Second Input Source .................................................... 16  
Notes on Mixing ...................................................................................... 16  
Using Talkover .............................................................................................. 17  
Using the Tone Controls ................................................................................ 18  
Troubleshooting ................................................................................................ 19  
Care and Maintenance ...................................................................................... 20  
Replacing the Fuse ....................................................................................... 21  
Specifications .................................................................................................... 22  
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FEATURES  
Your Optimus SSM-1250 3-Channel Stereo Audio Mixer is a sophisticated control  
center, perfect for mixing sound from multiple audio sources on three separate  
channels such as microphones, tuners, CD players, turntables, or the audio out-  
puts from VCRs. The mixer is ruggedly constructed for home or professional use.  
Its wide-range volume controls let you adjust each audio source’s sound level so  
you can get the best mix for playing through your sound system or for recording.  
1 DJ Microphone Input — lets you  
connect a balanced, low imped-  
ance microphone with an XLR  
plug.  
6 Slide Volume Controls — for fin-  
gertip control of sound mixing and  
fading.  
7 Cross Fader — lets you smoothly  
2 Microphone Treble — lets you  
switch between two input sources.  
adjust the microphone’s treble.  
8 Input Source Selectors — let  
you easily choose the desired au-  
dio input source to be played.  
3 Microphone Bass — lets you ad-  
just the microphone’s bass.  
4 Assign Controls — lets you se-  
9 Master Volume — lets you con-  
trol the mixer’s overall volume lev-  
el.  
lect the input sources to be mixed.  
5 Talkover — lowers the sound of  
the input sources so you can talk  
over them using the microphone.  
10 Output Level VU Meters — indi-  
cate the mixer’s total output signal  
level.  
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so you can monitor and prepare it  
before mixing it in.  
14 Cue/Program Control — lets you  
balance the volume of the output  
playing on the sound system and  
the input being prepared for mix-  
ing through the headphones.  
15 Lamp Jack — lets you connect a  
12V DC lamp to light the mixer  
controls.  
11 Mono/Stereo Selector — lets  
you set the output to stereo or  
monaural.  
16 Phones Jack — lets you connect  
a pair of stereo headphones with  
1
a /4-inch plug.  
12 Bass/Middle/Treble Controls —  
let you adjust the tone of the se-  
lected output to get just the right  
sound.  
17 Cue Level — lets you adjust the  
headphone’s volume level.  
18 Stereo Line Outputs — let you  
connect the mixer’s output to your  
receiver/amplifier and tape deck  
so you can play the sounds from  
your input sources through your  
speaker system, and record them.  
13 Cue Assign Controls — lets you  
select the channel where the de-  
sired audio input source is located  
19 Stereo Line Inputs — let you  
connect most line-level audio  
sources such as a CD player, tape  
deck, tuner, camcorder, or VCR.  
20 Stereo Phono Inputs — for con-  
necting low-level audio sources,  
such as turntables with a magnet-  
ic cartridge.  
illustration of mixer back  
21 Microphone Input — lets you  
connect a low impedance micro-  
1
phone with a /4-inch plug instead  
of one with an XLR plug.  
5
 
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PREPARATION  
Warning: A sudden high output from  
the mixer could damage your hearing,  
especially if you use headphones, and  
might also damage the audio devices  
connected to the mixer’s output. Be-  
fore using the mixer, make sure you  
set your receiver/amplifier’s volume  
control to its minimum volume level  
setting.  
illustration of output AMP  
to sound system  
Before you connect the AC power  
cord, make sure you set POWER to off.  
And, to avoid sudden and unusable  
sound outputs from any audio devices  
that you connect to the mixer, be sure  
to have their power controls set to off  
(and any tone controls set to flat).  
To record the mixer’s output signal,  
connect one end of an audio patch  
cord (Cat. No. 42-2356, not supplied)  
to the mixer’s REC L (white) and R  
(red) output jacks, then connect the  
other end to your tape deck’s left and  
right line input jacks (matching left to  
left, and right to right).  
CONNECTING THE  
OUTPUTS  
To play the mixer’s output signal  
through your sound system (for events  
such as parties, dances, conferences,  
and so on), connect one end of an au-  
dio patch cord (Cat. No. 42-2356, not  
supplied) to the mixer’s AMP L (white)  
and R (red) output jacks, then connect  
the other end to your receiver/amplifi-  
er’s left and right line input jacks  
(matching left to left, and right to right).  
illustration of output REC  
to recorder  
AMP connections should  
still appear  
CONNECTING THE  
INPUTS  
You can connect up to four line-level  
and up to two low-level audio input  
sources to the input jacks on the back  
of the mixer. You can also connect a  
microphone to the mixer’s front or  
back panel.  
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1. Connect the line-level outputs from up to four audio sources (such as a CD  
player, tape deck, tuner, camcorder, or VCR) to the LINE 1, LINE 2, LINE 3, and  
LINE 4 input jacks (matching left to left, right to right).  
illustration of line-level  
connections  
AMP and REC connections  
should also appear  
Do not connect an audio source with a line-level output to the low-  
Caution:  
level PHONO 1 or PHONO 2 input jacks.  
2. Connect the low-level outputs from up to two audio sources (such as magnetic-  
cartridge turntables) to the PHONO 1 and PHONO 2 input jacks (matching left to  
left, right to right).  
illustration of low-level  
connections  
AMP, REC, and line-level  
connections should also  
appear  
If you connect magnetic-cartridge turntables, also connect their ground  
Note:  
wires (usually black or green) to GND.  
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3. Connect a microphone (not sup-  
plied) to the mixer.  
CONNECTING POWER  
Connect the power cord to a standard  
AC outlet.  
• If the microphone has an XLR  
plug, connect it to MIC on the  
top left corner of the front panel.  
The power cord has a polarized  
Note:  
plug that fits only one way into a stan-  
dard AC outlet. If the plug does not fit,  
turn it clockwise so it fits properly. Do  
not force the plug into the AC outlet or  
you could damage the outlet or the  
plug.  
illustration of microphone  
plug being inserted into jack  
Do not show entire  
microphone  
CONNECTING A LAMP  
1
• If the microphone has a /4-inch  
The mixer has a 12V BNC lamp sock-  
et for connecting a 12V DC/3W lamp  
(RSU Cat. No. 11443363) so you can  
see the control panel in dark or low-  
light conditions.  
plug, connectitto MICon thelow-  
er right corner of the back panel.  
illustration of microphone  
plug being inserted into jack  
Do not show entire  
microphone  
illustration of lamp  
being connected  
We recommend you do not  
Note:  
connect an XLR and a 1/4-inch  
plug microphone to the mixer at  
the same time.  
Use only a 12V DC/3W  
Caution:  
lamp.  
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Listening Safely  
CONNECTING  
HEADPHONES  
Do not listen at extremely high volume  
levels. Extended high-volume listening  
can lead to permanent hearing loss.  
To listen in privacy or monitor the au-  
dio source inputs so you can locate an  
exact passage or section before mix-  
ing it, plug a pair of stereo head-  
phones (not supplied) with a /4-inch  
PHONES  
plug into the  
er’s right front panel.  
To protect your hearing when you use  
headphones, always follow these  
guidelines to set the listening volume.  
1
jack on the mix-  
CUE LEVEL  
• Set  
to the lowest set-  
ting before you begin listening.  
• After you put on the headphones,  
CUE LEVEL  
adjust  
to a comfort-  
illustration of headphones  
being connected  
able listening volume level.  
• Once you set your headphones’  
volume, do not increase it. Over  
time, your ears adapt to the vol-  
ume level, so a level that no  
longer causes discomfort might  
still damage your hearing.  
Your local RadioShack store carries a  
wide selection of headphones.  
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OPERATION  
1. Set the volume levels on the out-  
put devices (receiver/amplifier and  
tape deck) to minimum and turn  
them on.  
PRESETTING THE INPUT  
SIGNAL LEVELS  
To avoid accidentally overdriving a  
channel or prematurely mixing in an  
audio input source, make sure you  
start with the following settings:  
2. Press POWER to turn on the mix-  
er. The red power indicator lights.  
• Volume slide controls set to 0  
illustration of POWER  
button w/indicator lit  
illustration  
3. Turn on the input sources you  
want to mix.  
4. Using the mixer requires two basic  
operations:  
ASSIGN A and ASSIGN B set to  
OFF  
• Presetting the input signal lev-  
els (see “Presettiing the Input  
Signal Levels”)  
• Mixing the audio input sources  
(see “Mixing the Inputs” on  
Page 15)  
illustration  
5. After you finish mixing, turn down  
the volume on the output audio  
devices, turn off the input and out-  
put 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.  
MIC TREBLE, MIC BASS, CUE LEV-  
EL, TREBLE, MID, BASS, and  
MASTER set to 0  
illustration  
10  
 
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Rotate MASTER clockwise and tempo-  
rarily set it to about the 5th marker.  
Presetting the Microphone  
1. If your microphone has an ON/  
OFF control, set it to ON.  
2. Set OFF/ON/TALKOVER to ON.  
illustration  
illustration  
The MASTER volume control  
Note:  
adjusts the overall volume of DJ MIC,  
CH1, CH2, and CH3.  
The mixer uses two volume unit (VU)  
meters to indicate the total stereo out-  
put signal level. For the best results,  
each input signal level should normal-  
ly 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.  
3. While continuously talking, adjust  
DJ MIC until you get a reading of  
up to 0 on both VU meters.  
illustration DJ MIC  
illustration of VU meters  
at 0  
4. Set OFF/ON/TALKOVER to OFF.  
Presetting the Channel 1/2/3  
Input Sources  
For monaural output, set MONO/STE-  
REO to MONO. For stereo output, set  
MONO/STEREO to STEREO.  
Before you mix channels 1, 2, and 3,  
you must preset the input signal level  
for each channel input source (up to  
six sources).  
illustration of mixer front  
w/arrow to control  
11  
 
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PHONO 1  
1. To preset the  
input  
to  
If you did not connect an input source  
to every jack or do not want to mix ev-  
ery input source connected to the mix-  
er’s input jacks, you do not need to  
follow all the steps in this section. Af-  
ter you decide which source(s) you  
want to preset and mix, use this table  
to determine which steps to follow.  
PHONO 1 LINE 1  
source, set  
PHONO 1  
/
.
illustration of  
PHONO 1/LINE 1 set  
to PHONO 1  
To Preset  
See Steps  
Channel 1 Phono 1  
Line 1  
1–4  
5
2. Start playback of the selected in-  
put source.  
Channel 2 Phono 2  
Line 2  
6–9  
10  
CH 1  
3. Slowly slide up the  
volume  
level slide control until you get a  
0
reading of up to  
meters.  
on both VU  
Channel 3  
Line 3  
Line 4  
11–14  
15  
Notes:  
illustration of CH 1 control  
• While you adjust the input signal  
levels for channels 1, 2, and 3, ei-  
ther use the headphones or turn  
up the receiver/amplifier’s volume  
to a comfortable listening level  
(not necessarily the final usable  
level).  
Important: Write down or remem-  
CH 1  
ber the  
volume level slide  
control’s setting for the selected  
audio source, so each time you  
want to mix that source you can  
• Do not play a quiet portion of mu-  
sic while you adjust the volume  
levels, otherwise the volume lev-  
els for channels 1, 2, and 3 will be  
overdriven during the loud por-  
tions of the music.  
CH 1  
slide the  
volume level slide  
control to the correct setting.  
Note: If it was necessary to set  
CH 1  
the  
all the way to  
reading of up to 0 on the VU  
volume level slide control  
10  
in order to get a  
CH 1  
meter, then slide  
down to  
8
MASTER  
about and rotate  
clock-  
wise until you get the reading of 0  
on the VU meters.  
12  
 
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4. Stop playback of the selected in-  
put source.  
Write down or remem-  
Important:  
ber the CH 2 volume level slide  
control’s setting for the selected  
audio source, so each time you  
want to mix that source you can  
slide the CH 2 volume level slide  
control to the correct setting.  
5. To preset the LINE 1 input source,  
set PHONO 1/LINE 1 to LINE 1.  
Then repeat Steps 2–4.  
If you have to readjust MAS-  
Note:  
TER when performing Step 3, re-  
member that this affects the level  
of the previously preset input  
sources. You must readjust those  
sources until you get a reading of  
up to 0 on the VU meters for each.  
If it was necessary to set  
Note:  
the CH 2 volume level slide control  
all the way to 10 in order to get a  
reading of up to 0 on the VU  
meter, then slide CH 2 down to  
about 8 and rotate MASTER clock-  
wise until you get the reading of 0  
on the VU meters.  
6. To preset the PHONO 2 input  
source, set PHONO 2/LINE 2 to  
PHONO 2.  
9. Stop playback of the selected in-  
put source.  
illustration of  
PHONO 2/LINE 2 set  
to PHONO 2  
10. To preset the LINE 2 input source,  
set PHONO 2/LINE 2 to LINE 2.  
Then repeat Steps 7–9.  
If you have to readjust MAS-  
Note:  
TER when performing Step 8, re-  
member that this affects the level  
of the previously preset input  
sources. You must readjust those  
sources until you get a reading of  
up to 0 on the VU meters for each.  
7. Start playback of the selected in-  
put source.  
8. Slowly slide up the CH 2 volume  
level slide control until you get a  
reading of up to 0 on both VU  
meters.  
11. To preset the LINE 3 input source,  
set LINE 3/LINE 4 to LINE 3.  
illustration of CH 2 control  
illustration of  
LINE 3/LINE 4 set to  
LINE 3  
12. Start playback of the selected in-  
put source.  
13  
 
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16. To prevent prematurely mixing au-  
dio sources, set all volume level  
slide controls to 0.  
13. Slowly slide up the CH 3 volume  
level slide control until you get a  
reading of up to 0 on both VU  
meters.  
Checking the Sound  
1. Select one of the input sources,  
then start playback of the selected  
source.  
illustration of CH 3 control  
2. Set the volume level slide control  
to the position you determined  
during presetting. The VU meters  
should show a reading of up to 0  
dB.  
Write down or remem-  
Important:  
ber the CH 3 volume level slide  
control’s setting for the selected  
audio source, so each time you  
want to mix that source you can  
slide the CH 3 volume level slide  
control to the correct setting.  
3. Turn up the receiver/amplifier’s  
volume until it reaches the desired  
level for the location or event  
where the mixer will be used (this  
can vary).  
If it was necessary to set  
Note:  
the CH 3 volume level slide control  
all the way to 10 in order to get a  
reading of up to 0 on the VU  
meter, then slide CH 3 down to  
about 8 and rotate MASTER clock-  
wise until you get the reading of 0  
on the VU meters.  
4. Adjust BASS, MID, and TREBLE to  
get the desired sound (see “Using  
the Tone Controls” on Page 18).  
If adjusting BASS, MID, and  
Note:  
TREBLE causes the VU meters to  
exceed 0 dB, rotate MASTER  
counterclockwise until the read-  
ing returns to 0. Then adjust your  
output device (amplifier) volume  
accordingly.  
14. Stop playback of the selected in-  
put source.  
15. To preset the LINE 4 input source,  
set LINE 3/LINE 4 to LINE 4. Then  
repeat Steps 12–14.  
5. Stop playback of the selected in-  
put source.  
If you have to readjust MAS-  
Note:  
Do not adjust MASTER after  
checking the sound.  
Note:  
TER when performing Step 13, re-  
member that this affects the level  
of the previously preset input  
sources. You must readjust those  
sources until you get a reading of  
up to 0 on the VU meters for each.  
14  
 
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2. Set the input source selector to  
the preset input source you want  
to play first through your sound  
system.  
MIXING THE INPUTS  
You can connect input signals from up  
to six audio sources, select any two,  
then mix them so only one or both  
play through your sound system.  
illustration  
Mixing requires three operations:  
• Playing one input source  
• Monitoring the next input source  
• Switching to the next input source  
3. Make sure the first input source’s  
volume level slide control is set to  
the correct preset position.  
You can play either of the two select-  
ed sources first.  
4. Start playback of the input source.  
Notes:  
• Ensure the volume level slide con-  
trol for the other input channel  
source is set to 0.  
Monitoring a Second  
Input Source  
Monitoring a second input source’s  
signal level requires selecting the in-  
put source that is not currently play-  
ing, finding the desired section you  
want to mix, then adjusting that  
source’s sound level so it matches the  
volume level of the source currently  
playing.  
• The CUE ASSIGN switches are  
push-on and push-off. You can se-  
lect more than one at a time.  
Playing One Input Source  
ASSIGN A  
1. Set  
to the desired  
CROSS FADER  
source, then set  
to  
1. Connect and put on headphones.  
A
.
Note: You can listen to one chan-  
nel through the headphones while  
the other channel is playing  
through the sound system.  
illustration of ASSIGN A  
set to 1 and CROSS  
FADER set to A  
ASSIGN B  
2. Set  
to the second input  
source.  
15  
 
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tem, slide CROSS FADER from A  
3. Press CUE ASSIGN for the second  
to B.  
input source.  
illustration of CUE  
ASSIGN with arrow to  
CH 2  
illustration of CROSS  
FADER w/arrow  
from A to B  
4. Set the input source selector to  
the input source you want to mon-  
itor.  
Slide CROSS FADER:  
To the left to fade in the channel  
selected by ASSIGN A and fade  
out the channel selected by AS-  
SIGN B.  
illustration  
To the right to fade in the chan-  
nel selected by ASSIGN B and  
fade out the channel selected  
by ASSIGN A.  
5. Start playback of the input source  
you want to play next through your  
sound system.  
To the center to equally mix the  
two.  
6. If necessary:  
Notes on Mixing  
• Adjust CUE LEVEL to a comfort-  
able listening level.  
• If you set CROSS FADER to A to  
play the channel selected by AS-  
SIGN 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, to CH 4 to monitor  
CH 4, and to MIC to monitor DJ  
MIC. The same applies when you  
set CROSS FADER to B.  
• Adjust the second input source  
volume slide control to the cor-  
rect preset position.  
7. Set the input device to the desired  
section of music, then stop or  
pause the input device.  
Switching to the Second  
Input Source  
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.  
1. Start playback of the second input  
source.  
2. When you are ready to play its  
sound through your sound sys-  
16  
 
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• 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 monitor-  
ing. For example, to monitor chan-  
nel 1 (selected by ASSIGN A)  
while channel 2 (selected by AS-  
SIGN B) is playing, slide CROSS  
FADER to B.  
USING TALKOVER  
illustration of switch  
set to TALKOVER  
When you are not using the micro-  
phone, leave OFF/ON/TALKOVER set  
to OFF. The microphone’s input is  
turned off and all other audio input  
sources are unaffected.  
• Use CUE/PGM to listen to the input  
controlled by the CUE ASSIGN  
switch and what is playing on the  
currently selected output device.  
When CUE/PGM is set to CUE, you  
only hear the channel selected by  
the CUE ASSIGN switches. When  
CUE/PGM is set to PGM, you only  
hear what is playing on the cur-  
rently selected output device. Ro-  
tate CUE/PGM to listen to both  
inputs at the same time.  
If you want to use a microphone:  
• Set OFF/ON/TALKOVER to ON to  
mix the microphone equally with  
the other audio input sources.  
• Set OFF/ON/TALKOVER to TALK-  
OVER to mix the microphone at a  
higher level than the other audio  
input sources.  
Your voice sounds clearly through  
the microphone, but all the other  
audio input sources sound at a  
lower level. (This is useful for pag-  
ing.)  
17  
 
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USING THE TONE  
CONTROLS  
Your mixer has one set of tone con-  
trols for the microphone and another  
set for channels 1, 2, and 3. You can  
tailor the high and low frequency  
sounds for the microphone and tailor  
the high, low, and mid frequency  
sounds for channels 1, 2, and 3.  
illustration of mixer front  
w/arrows to the control  
locations  
BASS MID  
,
For normal sound, leave  
TREBLE MIC BASS MIC  
and  
,
and  
TREBLE  
(or  
for the microphone) set to .  
0
TREBLE  
+10  
MIC TREBLE  
Rotate  
ward  
(or  
to increase, or toward – to  
decrease the high frequency sounds.  
) to-  
10  
MID  
+10  
to increase or  
Rotate  
toward  
10  
toward – to decrease the middle fre-  
quency sounds.  
BASS  
MIC BASS  
Rotate  
+10  
(or  
to increase or toward – to de-  
crease the low frequency sounds.  
) toward  
10  
18  
 
32-3009.fm Page 19 Tuesday, August 10, 1999 8:31 AM  
TROUBLESHOOTING  
With proper care and handling, your mixer should give you years of trouble-free  
service. However, if your SSM-1250 is not working properly, follow these sugges-  
tions to see if you can eliminate the problem. If you cannot, take the mixer to your  
local RadioShack store for assistance.  
Problem  
Nothing works  
Possible Solution  
Check the AC power connection and make sure the AC  
outlet is “live.”  
Check all the connections to the system (amplifier/  
receiver, input sources, and so on).  
Check the fuse. See “Replacing the Fuse” on Page 21.  
No signal from an audio Make sure the OFF/ON/TALKOVER switch is not set to  
input source  
TALKOVER.  
Check the mixer’s and the source’s control settings.  
Check the connection between the mixer and the input  
source.  
Hum from PHONO  
sources  
Make sure the turntable’s ground wire (usually black or  
green) is connected to the GND screw on the back of  
the mixer.  
Hum from other input  
sources  
Make sure there are no low-level inputs connected to  
the LINE input jacks.  
Feedback “squeals”  
Move the microphone further away from the output  
speakers or use a unidirectional microphone.  
19  
 
32-3009.fm Page 20 Tuesday, August 10, 1999 8:31 AM  
CARE AND MAINTENANCE  
Your Optimus SSM-1250 3-Channel Stereo Audio Mixer is an example of superior  
design and craftsmanship. The following suggestions will help you care for your  
mixer so you can enjoy it for years.  
Keep the mixer dry. If it gets wet, wipe it dry immediately. Liquids  
might contain minerals that can corrode the electronic circuits.  
Use and store the mixer only in normal temperature environments.  
Temperature extremes can shorten the life of electronic devices and  
distort or melt plastic parts.  
Keep the mixer away from dust and dirt, which can cause premature  
wear of parts.  
Handle the mixer gently and carefully. Dropping it can damage circuit  
boards and cases and can cause the mixer to work improperly.  
Wipe the mixer with a damp cloth occasionally to keep it looking new.  
Do not use harsh chemicals, cleaning solvents, or strong detergents  
to clean the mixer.  
Modifying or tampering with the mixer’s internal components can cause a mal-  
function and might invalidate your mixer’s warranty. If your mixer is not performing  
as it should, take it to your local RadioShack store for assistance.  
20  
 
32-3009.fm Page 21 Tuesday, August 10, 1999 8:31 AM  
REPLACING THE FUSE  
The mixer uses a fuse for protection  
from power surges and short circuits.  
If the mixer suddenly turns off and will  
not turn on, check the fuse. If neces-  
sary, replace the fuse with a 0.5-amp,  
1
250-volt, fast-acting, 11/4 × /4 inch fuse  
such as Cat. No. 270-1003 (not sup-  
plied).  
Follow these steps to replace the fuse.  
1. Disconnect power from the mixer.  
2. Using a Phillips screwdriver, un-  
screw the fuse compartment cap  
on the back of the mixer.  
illustration  
3. Remove the old fuse and insert  
the new one.  
Caution: Make sure you replace  
the fuse only with another fuse of  
the same type and rating.  
4. Replace the fuse compartment  
cap.  
5. Reconnect power.  
21  
 
32-3009.fm Page 22 Tuesday, August 10, 1999 8:31 AM  
SPECIFICATIONS  
Input Sensitivity/Input Impedance  
DJ Mic (XLR jack) ....................... 1.5 mV/600 Ohms, Balanced/Unbalanced  
Mic 2 (Phone jack) ...................... 1.5 mV/600 Ohms, Balanced/Unbalanced  
PHONO 1, PHONO 2 .............................................................. 3 mV/50 kOhms  
LINE 1, LINE 2, LINE 3, LINE 4 ........................................... 150 mV/10 kOhms  
Output Level  
Main Out .................................................................................. 2 V/10 kOhms  
Record .............................................................................. 100 mV/10 kOhms  
Frequency Response .................................................... 20 Hz–20 kHz +3 dB  
S/N Ratio (for 1 kHz Input)  
Mic ........................................................................................................ 60 dB  
Phono ................................................................................................... 70 dB  
Line ...................................................................................................... 80 dB  
Distortion  
Mic ......................................................................................................... 0.2%  
Phono .................................................................................................. 0.05%  
Line ..................................................................................................... 0.03%  
Tone Control (MIC)  
Treble ................................................................................................. ±10 dB  
Bass ................................................................................................... ±10 dB  
Tone Control (MASTER)  
Treble ................................................................................................. ±10 dB  
Middle ................................................................................................. ±10 dB  
Bass ................................................................................................... ±10 dB  
Talkover Attenuation .................................................................................... –16 dB  
Power Source .......................................................... AC 120V AC, 60 Hz, 20 Watts  
Dimensions (HWD) ............................................................... 43/4 × 19 × 71/2 Inches  
(120 × 482 × 192 mm)  
Weight ...................................................................................................... 8 lbs 9 oz  
(3.9 kg)  
Specifications are typical; individual units might vary. Specifications are subject to  
change and improvement without notice.  
22  
 
32-3009.fm Page 23 Tuesday, August 10, 1999 8:31 AM  
NOTES  
23  
 
32-3009.fm Page 24 Tuesday, August 10, 1999 8:31 AM  
Limited One-Year Warranty  
This product is warranted by RadioShack against manufacturing defects in material and workman-  
ship under normal use for one (1) year from the date of purchase from RadioShack company-owned  
stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED HEREIN, Ra-  
dioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES, INCLUDING  
THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED  
IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED  
HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABILITY OR RE-  
SPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY  
LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFOR-  
MANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, IN-  
CLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS  
OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT, SPECIAL, INCIDEN-  
TAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE  
POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-  
cidental or consequential damages, so the above limitations or exclusions may not apply to you.  
In the event of a product defect during the warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-  
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and  
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase  
price. All replaced parts and products, and products on which a refund is made, become the prop-  
erty of RadioShack. New or reconditioned parts and products may be used in the performance of  
warranty service. Repaired or replaced parts and products are warranted for the remainder of the  
original warranty period. You will be charged for repair or replacement of the product made after the  
expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,  
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or  
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs  
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as  
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs  
of product removal, installation, set-up service adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102  
We Service What We Sell  
3/97  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
6A7  
Printed in China  
 

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