Radio Shack Music Mixer SSM 1750 User Guide

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SSM-1750 4-Channel  
Stereo Audio Mixer  
 
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Care ....................................................................................................................................... 14  
Replacing the Fuse ......................................................................................................... 14  
Troubleshooting ................................................................................................................... 14  
Specifications ...................................................................................................................... 15  
WARNING:  
To reduce the risk of fire or  
shock hazard, do not expose this product to rain  
or moisture.  
CAUTION  
RISK OF ELECTRIC SHOCK.  
!
DO NOT OPEN.  
CAUTION:  
TO REDUCE THE RISK OF  
ELECTRIC SHOCK, DO NOT REMOVE  
COVER OR BACK. NO USER-SERVICE-  
ABLE PARTS INSIDE. REFER SERVICING  
TO QUALIFIED PERSONNEL.  
This symbol is intended to alert  
you to the presence of uninsu-  
lated dangerous voltage within  
the product’s enclosure that might  
be of sufficient magnitude to con-  
stitute a risk of electric shock. Do  
not open the product’s case.  
This symbol is intended to inform  
you that important operating and  
maintenance instructions are  
included in the literature accom-  
panying this product.  
!
3
 
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ˆ Features  
Your RadioShack 4-Channel Stereo Audio Mixer is a sophisticated control center, perfect for  
mixing sound from multiple playback sources such as a microphone, tuner, CD player, turnta-  
ble, or the audio output from a VCR.  
It is ruggedly constructed for home or professional use and its wide-range volume controls let  
you adjust sound levels to achieve the right mix for playing through your speaker system or for  
recording. The mixer's many features give you almost limitless sound combinations.  
1
2
DJ MIC  
5
6
LEVEL  
— lets you connect a balanced,  
— lets you adjust the micro-  
low impedance microphone with an XLR  
plug.  
phones' volumes before mixing them in.  
TALKOVER  
— decreases the volume of  
BASS/MID/HIGH —  
tone of the selected input for customized  
sound.  
let you adjust the  
the input sources so you can talk over  
them using the microphone.  
7
8
MUTE LEVEL  
— lets you adjust the back-  
3
4
GAIN  
TALK-  
ground music volume when using  
— individual controls let you fine  
OVER  
tune each input’s volume.  
.
PAN  
CH1 CH2 CH3 CH4 Slide Volume Con-  
— lets you control the output of the  
,
,
,
DJ MIC  
AUX MIC/LINE  
trols  
— for fingertip control of sound  
and  
.
mixing and fading.  
4
Features  
 
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9
Assign Controls—  
15 MASTER  
— adjusts the overall volume of  
let you select the in-  
DJ MIG AUX CH1 CH2 CH3 CH4 RE-  
put sources to be mixed.  
,
,
,
,
,
,
CEIVE  
input, and sound effects.  
10 CROSS FADER  
— lets you smoothly  
16 MONO/STEREO Selector  
switch between two input sources.  
— lets you set  
the output to stereo or monaural.  
11 SOUND EFFECT  
— let you create a spe-  
17 POWER —  
cial sound performance using the six  
preprogrammed sound effects.  
turns the mixer on and off.  
18 Lamp Jack  
— lets you install a 12V/3W  
12 CUE LEVEL  
— lets you adjust the head-  
lamp to light up the mixer controls.  
phone's volume.  
19 ECHO Controls —  
let you tailor the  
13 CUE ASSIGN  
— lets you select the chan-  
sound to compensate for a location’s  
conditions or for personal preference.  
nel where the desired audio input source  
is located so you can monitor and pre-  
pare it before mixing it in.  
20 VU (Volume Unit) —  
two meters indi-  
cate the total stereo output signal levels.  
14 BALANCE —  
lets you adjust the sound  
balance between the left and right  
speakers.  
21 Stereo Line Outputs  
— let you connect  
CD player, tape deck, tuner, camcorder,  
or VCR.  
the mixer's output to your receiver/am-  
plifier and tape deck so you can play the  
sounds from your input sources through  
your speaker system, and record them.  
24 Auxiliary Microphone Input  
— lets you  
connect a low impedance microphone  
1
with a /4-inch plug.  
22 Sound Effect Jacks  
— let you connect  
25 Stereo Phono Inputs  
— for connecting  
another sound effect device, such as an  
echo reverb, and either play the signal  
from it or play another input's signal  
through it. You can also vary the volume  
of the signal.  
low-level audio sources, such as a turn-  
table with a magnetic cartridge.  
26 Mono Line Input  
— lets you connect a  
mono input source, such as a wireless  
microphone receiver.  
23 Stereo Line Inputs —  
let you connect  
most line-level audio sources such as a  
5
Features  
 
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ˆ Preparation  
PRESETTING THE  
CONTROLS  
CONNECTING INPUTS  
You can connect up to ten audio input sourc-  
es (such as cassette tape decks, CD players,  
tuners, two magnetic-cartridge turntables, a  
camcorder or a VCR) to the mixer’s input  
jacks on the back panel. You can also con-  
nect microphones to the appropriate jacks on  
the top and back panels.  
Warning:  
A sudden high output from the  
mixer could damage your hearing, especially  
if you use headphones, and might also dam-  
age the audio devices connected to the mix-  
er's output. Before using the mixer, make  
sure you set your receiver/amplifier's volume  
control to its minimum volume level setting.  
1. Connect the line-level outputs from up to  
LINE 1 LINE2  
six audio sources to the  
,
,
Before you connect the power cord, make  
LINE 3 LINE 4 LINE 5  
LINE 6  
input  
,
,
, and  
POWER  
sure you set  
to off. To avoid sudden  
jacks, matching left to left, and right to  
right.  
and inaudible 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.  
Caution:  
Do not connect an audio  
source with a line-level output to the  
PHONO 1 PHONO 2 AUX  
, or  
audio input jacks.  
low-level  
MIC  
,
CONNECTING THE  
OUTPUTS  
2. Connect the low-level outputs from up to  
two audio sources (such as magnetic  
To play the mixer's output signal through  
your sound system (for events such as par-  
ties, dances, conferences, and so on), con-  
nect one end of an audio patch cord (not  
PHONO 1  
cartridge turntables) to the  
and  
input jacks, matching left to  
left, and right to right.  
PHONO 2  
OUTPUT AMP L  
supplied) to the mixer's  
R
Note:  
(white) and  
(red) jacks, then connect the  
If you connect magnetic cartridge  
other end to your receiver/amplifier's left and  
right input jacks, matching left to left, and  
right to right.  
turntables, connect their ground wires  
GND  
(usually black or green) to  
.
3. Connect a sound effect device (such as  
an echo reverb or a digital sampler pro-  
To record the mixer's output signal, connect  
one end of an audio patch cord (not sup-  
EFFECT SEND  
cessor) to the  
and  
(output)  
EFFECT RECEIVE  
(input) jacks,  
OUTPUT REC L  
plied) to the mixer's  
(white)  
R
and (red) 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.  
matching left to left, and right to right.  
4. Connect a mono input source (such as a  
wireless microphone receiver) to the  
AUX LINE MONO  
jacks, matching left to  
left, and right to right.  
6
Preparation  
 
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Connecting Microphones  
CONNECTING  
HEADPHONES  
You can connect two microphones (not sup-  
plied) to the mixer.  
To listen in privacy or monitor the audio  
source inputs so you can locate an exact  
passage or section before mixing it, connect  
Connect a microphone with an XLR plug to  
DJ MIC  
on the top panel’s upper left corner.  
a pair of stereo headphones (not supplied)  
1
PHONES  
with a /4-inch (6.35 mm) plug to the  
1
Connect a microphone with a /4-inch (6.35  
jack on the mixer's lower right corner.  
AUX MIC  
mm) plug to  
lower right corner.  
on the back panel’s  
Your local Radio Shack store carries a wide  
selection of headphones.  
CONNECTING POWER  
Listening Safely  
Note:  
Before you connect the mixer's power  
cord, make sure power is turned off by press-  
Do not listen at extremely high volume lev-  
els. Extended, high-volume listening can  
lead to permanent hearing loss.  
POWER  
ing  
(if the control is out, the power is  
off).  
Connect the power cord to a standard AC  
outlet.  
To protect your hearing when you use head-  
phones, always follow these guidelines to set  
the listening volume.  
Caution:  
The power cord has a polarized  
plug that fits only one way into a standard AC  
outlet. If the plug does not fit, turn it over so it  
fits properly. Do not force it!  
CUE LEVEL  
0
• Set  
to before you begin lis-  
tening.  
• After you put on the headphones, adjust  
CUE LEVEL  
to a comfortable listening  
CONNECTING A LAMP  
volume level.  
12V/3W MAX LAMP  
The mixer has a  
socket  
• Once you set the headphones' volume,  
do not increase it. Over time, your ears  
adapt to the volume level, so a volume  
level that does not cause discomfort  
might still damage your hearing.  
for connecting a 12V/3W BNC lamp so you  
can see the control panel in dark or low light  
conditions.  
ˆ Operation  
1. Set the volume levels on the output  
devices (receiver, amplifier, or tape  
deck) to minimum and turn them on.  
4. Preset the input signal levels (see “Pre-  
setting the Input Signal Levels” on  
Page 8).  
POWER  
2. Press  
to turn on the mixer. The  
5. Mix the audio input sources (see “Mixing  
the Inputs” on Page 10).  
POWER indicator lights.  
3. Turn on the input sources you want to  
mix.  
7
Operation  
 
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Notes:  
• If you did not connect an input source to  
6. 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  
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.  
POWER  
press  
so it pops up to turn off  
the mixer. The POWER indicator turns  
off.  
PRESETTING THE INPUT  
SIGNAL LEVELS  
• 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 lis-  
tening level (not necessarily the final  
usable level).  
To avoid accidentally over-driving a channel  
or prematurely mixing in an audio input  
source, start with the following settings:  
0
• All volume slide controls set to .  
• Do not play a quiet portion of music  
while you adjust the volume levels, oth-  
erwise the volume levels for channels 1,  
2, 3, and 4 will be over-driven during the  
loud portions of the music.  
ASSIGN  
OFF  
• Both  
switches set to  
knobs set mid level.  
.
GAIN  
• All  
• All  
HIGH MID  
BASS  
CUE  
controls,  
,
, and  
LEVEL DJ MIC LEVEL AUX LEVEL,  
,
,
1. Set the channel selector to the desired  
input source.  
SEND RECEIVE  
MASTER  
0
,
, and  
set to .  
MASTER  
Rotate  
clockwise and temporarily  
2. Start playback of the selected input  
source.  
set it to about the 5th marker.  
Note:  
the overall volume of  
MASTER  
volume control adjusts  
The  
HIGH MID  
BASS  
controls  
3. Adjust the  
,
, and  
DJ MIC AUX CH1 CH2  
,
,
,
,
as desired. See “Using the Tone Con-  
trols” on Page 11.  
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  
Note:  
If you are using an external equal-  
0
izer, leave the tone controls set to and  
adjust the tone on the external equalizer.  
0
never move into the red range ( or above).  
4. Slowly slide up the channel volume con-  
Distortion is likely to occur on audio peaks if  
the meter moves into the red range.  
0
trol until you get a reading of up to on  
both VU meters.  
MONO/STEREO  
For monaural output, set  
MONO  
to  
Important:  
Note 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.  
STEREO  
.
. For stereo output, set it to  
Presetting the Channel Inputs  
Follow these steps to preset each channel  
input you plan to mix.  
8
Operation  
 
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Notes:  
Notes:  
• If it was necessary to set  
DJ MIC LEVEL  
• If it was necessary to set the channel  
10  
AUX LEVEL  
10  
in order  
volume level slide control to  
to get a  
or  
all the way to  
0
0
reading of up to on the VU meter, then  
to get a reading of up to on the VU  
8
8
slide it down to about and adjust the  
meter, then turn it down to about and  
GAIN  
0
DJ MIC GAIN  
adjust the control to get a  
control to get a reading of up to  
0
on the VU meters. (See “Using Gain” on  
Page 11.)  
reading of up to on the VU meters.  
(See “Using Gain” on Page 11.)  
GAIN  
DJ MIC GAIN  
or  
• If the above does not work, set  
to  
If that does not work, set  
MASTER  
AUX GAIN  
MAS-  
to mid level and rotate  
mid level and rotate  
clockwise  
0
TER  
until you get a reading of on the VU  
clockwise until you get a reading of  
0
meters.  
on the VU meters.  
MASTER  
MASTER  
, remem-  
• Readjusting  
affects the level of  
• If you must readjust  
the previously set input sources. You  
must readjust those sources until you  
ber, doing so affects the level of the pre-  
viously set input sources. You must  
readjust those sources until you get a  
0
get a reading of up to  
on the VU  
0
meters for each input source.  
reading of up to on the VU meters for  
each input source.  
5. Stop playback of the selected input  
source.  
I
3. f your XLR or auxiliary microphone has  
an ON/OFF control, set it to OFF.  
6. Repeat these steps for each channel  
input you plan to mix.  
If your XLR or auxiliary microphone  
does not have an ON/OFF control, set  
DJ MIC LEVEL  
AUX LEVEL  
0
to .  
or  
Presetting a Microphone  
1. If your XLR or auxiliary microphone has  
an ON/OFF control, set it to ON.  
Presetting the Auxiliary Input  
AUX LINE  
1. To preset the  
input source, set  
If your XLR or auxiliary microphone  
does not have an ON/OFF control, set  
AUX  
LINE  
.
to  
DJ MIC LEVEL  
AUX LEVEL  
0
or  
to .  
2. Start playback of the selected input  
source.  
DJ MIC  
2. While talking continuously, adjust  
LEVEL  
AUX LEVEL  
HIGH MID  
BASS  
, and controls  
or  
until you get a  
3. Adjust the  
,
0
reading of up to on both VU meters.  
(See “Using an XLR Microphone” on  
Page 12 and “Using an AUX Micro-  
phone” on Page 12.)  
as desired. See “Using the Tone Con-  
trols” on Page 11.  
Note:  
If you are using an external equal-  
0
izer, leave the tone controls set to and  
Important:  
DJ MIC LEVEL  
AUX  
or  
Note the  
adjust the tone on the external equalizer.  
LEVEL  
setting, so each time you want to mix  
AUX LEVEL  
4. Slowly adjust  
until you get a  
the microphone, you can set the control to  
the correct setting.  
0
reading of on both VU meters.  
9
Operation  
 
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Important:  
AUX LEVEL  
setting,  
Note the  
To avoid sudden and inaudible sound out-  
puts from any audio devices that you con-  
nect to the mixer, be sure to set their power  
controls to off and any tone controls to flat.  
so each time you want to mix that  
source you can set the control to the  
correct setting.  
Notes:  
Playing One Input Source  
AUX LEVEL  
• If it was necessary to set the  
ASSIGN A  
1. Set  
to the desired source,  
10  
0
control to  
to get a reading of up to  
CROSS FADER  
A
.
then set  
to  
AUX LEVEL  
on the VU meter, then set  
to  
8
AUX GAIN  
control  
about and adjust the  
CH 1 CH 2  
,
2. Select the mixer's input —  
,
0
to get a reading of up to on the VU  
meters. (See “Using Gain” on Page 11.)  
CH 3  
CH 4  
.
, or  
3. Set the input selector control to the input  
source you want to play first through  
your sound system.  
AUX  
• If the above does not work, set  
GAIN  
MASTER  
mid level and rotate  
0
clockwise until you get a reading of on  
the VU meters.  
4. Adjust the receiver's or amplifier's (not  
the mixer's) volume control to the  
desired volume.  
MASTER  
• Readjust  
affects the level of the  
previously set input sources. You must  
readjust those sources until you get a  
reading of up to on the VU meters for  
Make sure the first input source's vol-  
ume level slide control is set to the cor-  
rect preset position.  
0
each.  
5. Stop playback of the selected input  
source.  
5. Start playback of the input source.  
Monitoring a Second Input Source  
MIXING THE INPUTS  
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 vol-  
ume level of the source currently playing.  
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.  
1. Connect and put on headphones.  
Note:  
You can listen to one channel  
• Monitoring the next input source.  
• Switching to the next input source.  
through the headphones while the other  
channel is playing through the sound  
system.  
You can start with either of the two selected  
sources.  
ASSIGN  
B
2. Set  
to the second input  
source.  
To prevent prematurely mixing audio sourc-  
CUE ASSIGN  
3. Set  
to the audio input  
0
es, set all volume level controls to .  
CH 1 CH 2 CH 3  
CH 4  
) you  
source (  
,
,
, or  
want to monitor.  
10  
Operation  
 
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4. Set the desired channel volume level  
slide control to the preset position.  
To mix any two inputs selected by the  
ASSIGN  
ASSIGN  
switches, set each  
switch to the desired channel. Then use  
CUE LEVEL  
5. Adjust  
to a comfortable lis-  
CROSS FADER  
to mix the two.  
tening level.  
CROSS FADER  
• Do not slide  
to the center  
6. Start playback of the input source you  
want to play next through your sound  
system.  
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 sys-  
7. Set the input device to the desired sec-  
tion of music, then stop or pause the  
input device.  
CROSS FADER  
tem. Instead, slide  
to the  
channel you are not monitoring. For  
example, to monitor channel 1 (selected  
ASSIGN A  
by  
by  
) while channel 2 (selected  
Switching to the Second Input  
Source  
ASSIGN B  
CROSS  
) is playing, slide  
FADER  
B
.
to  
CUE LEVEL  
• Use  
to listen to the input  
1. Start playback of the second input  
source.  
CUE ASSIGN  
controlled by the  
switch  
and what is playing on the currently  
selected output device.  
CROSS FADER  
A
B
2. Slide  
from  
to when  
you are ready to play the second  
source’s sound through your sound sys-  
tem.  
USING THE SPECIAL  
CONTROLS  
CROSS FADER  
Slide  
:
Using the Tone Controls  
To the left to fade in the channel  
ASSIGN A  
selected by  
and fade out  
Your mixer has a set of tone controls for  
each microphone and for channels 1–4. You  
can tailor the high, middle, and low frequen-  
cy sounds for each.  
ASSIGN B  
the channel selected by  
.
To the right to fade in the channel  
ASSIGN B  
selected by  
and fade out  
ASSIGN A  
the channel selected by  
.
BASS MID  
For normal sound, leave  
,
, and  
HIGH  
0
set to .  
To the center to equally mix the two.  
HIGH MID  
BASS  
+10  
toward  
Rotate  
,
or  
to in-  
–10  
crease, or toward  
respectively to de-  
Notes on Mixing  
crease the high, middle, and low frequency  
sounds.  
CROSS FADER  
A
• If you set  
to to play the  
ASSIGN A  
channel selected by  
must set  
, then you  
CH 1  
to monitor  
CUE ASSIGN  
to  
Using Gain  
CH 1  
CH 2  
CH 2  
CH 3  
to  
, to  
to monitor  
, to  
to monitor  
. The same applies when you set  
CH 3  
CH 4  
, and to  
CH  
monitor  
4
Since the input levels of each sound source  
are different, the  
GAIN  
controls let you fine  
CROSS FADER  
B
.
to  
tune each selected input's volume. Rotate  
GAIN  
MAX  
to in-  
the desired  
control toward  
MIN  
crease the volume and toward  
it.  
to reduce  
11  
Operation  
 
32-3008.fm Page 12 Thursday, April 6, 2000 4:03 PM  
Note:  
GAIN  
We recommend you not adjust the  
controls after you have preset the in-  
Using TALKOVER  
To use the microphone and reduce other au-  
dio inputs so the microphone can be heard  
puts as some sound imbalance could occur.  
TALKOVER  
ON  
.
more clearly, set  
to  
Setting the Sound Balance  
TALKOVER  
ALKOVER  
to  
To turn off  
OFF  
, set T  
BALANCE  
lets you adjust the sound balance  
DJ MIC  
. All the audio inputs including  
between the left and right speakers. If your  
speakers are properly positioned and your  
listening area is centered between the  
speakers, the center setting of the control is  
usually the best.  
AUX MIC  
and  
play at the same output level,  
and the background music volume is not re-  
duced.  
Using MUTE LEVEL  
If the sound seems to be louder from one  
To increase background music when using  
BALANCE  
speaker, adjust  
until the sound  
TALKOVER  
MUTE LEVEL  
MIN  
.
, rotate  
toward  
seems to be coming from a point midway be-  
tween the speakers.  
To reduce background music, rotate it to-  
MAX  
ward  
.
USING A MICROPHONE  
Using PAN  
Using an XLR Microphone  
AUX LINE  
To play either microphone or the  
output on the left or right channel, adjust the  
To mix the microphone connected to the  
XLR jack with other audio input sources, ad-  
PAN  
L
appropriate  
control. Set it to to play  
R
through the left channel, to to play through  
DJ MIC LEVEL  
just  
to increase or decrease  
the right channel, or to any other position be-  
the microphone volume without affecting the  
volume of the other inputs.  
L
R
tween and to play through both channels.  
DJ MIC LEVEL  
0
Set  
to when you are not us-  
USING SOUND EFFECTS  
ing the DJ microphone. Or, if the microphone  
has an ON/OFF control, set it to OFF and  
There are six preprogrammed sound effects  
for your mixing selection — a hi-hat close, a  
rim shot, a cow bell, a cymbal, a bass drum,  
and a laser drum.  
DJ MIC LEVEL  
leave  
at its preset position.  
Using an AUX Microphone  
To play a sound effect, repeatedly press or  
AUX  
To mix a microphone connected to the  
MIC  
SOUND EFFECT  
hold down the desired  
ton.  
but-  
jack with other audio input sources, set  
AUX MIC/LINE  
MIC  
AUX LEVEL  
. Adjust to  
to  
increase or decrease the microphone vol-  
ume without affecting the volume of the other  
inputs.  
SOUND EFFECT LEVEL  
Rotate  
left or right to  
increase and decrease the sound effect vol-  
ume.  
AUX  
When you are not using an  
microphone,  
LINE  
. This lets you mix  
USING ECHO EFFECTS  
AUX MIC/LINE  
set  
to  
AUX  
the output from the device connected to  
The mixer plays echo effects, and lets you  
adjust the echo delay, the number of echo  
repeats, and the echo's volume.  
LINE MONO  
jacks.  
12  
Operation  
 
32-3008.fm Page 13 Thursday, April 6, 2000 4:03 PM  
The echo is applied to the sound before all  
the inputs are mixed.  
Playing Input Signals through the  
Sound Effect Device  
ECHO  
MIC  
to turn on the echo effect  
Set  
to  
You can play inputs selected by the channel  
AUX LINE  
for the microphones and the  
input.  
DJ MIC  
AUX  
through other  
selectors,  
, or  
sound effect devices connected to the mixer,  
such as an echo reverb or a digital sampler  
processor, and control playback through the  
mixer. To play selected inputs through the  
ECHO  
MUSIC  
to turn on the echo effect  
Set  
to  
for Channels 1, 2, 3, and 4 outputs.  
ECHO  
OFF  
.
To turn off the echo effect, set  
to  
SEND ASSIGN  
sound effect device, set  
selected input.  
to the  
Adjusting the Echo Delay, Repeat,  
and Volume  
SEND  
The  
control lets you adjust the volume  
of the selected sound to the sound effect de-  
vice without changing the device's volume.  
ECHO DELAY  
The  
control lets you adjust the  
ECHO DELAY  
0
time delay for an echo. Set  
for a minimum time delay and to  
maximum time delay.  
to  
SEND  
10  
to increase the vol-  
Rotate  
toward  
10  
for a  
0
ume and toward to decrease it.  
ECHO REPEAT  
The  
control lets you control  
the length of time a tone is repeated (rever-  
ECHO REPEAT  
10  
for the  
beration). Set  
to  
0
longest time repeat and to for the shortest.  
ECHO LEVEL  
The  
control lets you adjust the  
ECHO  
output level of the echo effect. Rotate  
LEVEL  
10  
to increase the echo level  
toward  
0
and toward to decrease it.  
USING SOUND EFFECT  
DEVICES  
Playing the Signal from the Sound  
Effect Device  
To play signals from a device connected to  
EFFECT  
RECEIVE  
switch to  
the  
jacks, set the  
ON  
. When you are not using the connected  
RECEIVE  
OFF  
.
inputs, set the  
switch to  
RECEIVE  
Rotate  
to adjust the volume of the  
EFFECT  
input connected to the  
jacks without  
changing the sound effect device's volume.  
RECEIVE  
10  
to increase the  
Rotate  
toward  
0
volume and toward to decrease it.  
13  
Operation  
 
32-3008.fm Page 14 Thursday, April 6, 2000 4:03 PM  
ˆ Care  
To enjoy your mixer for a long time:  
REPLACING THE FUSE  
• Keep the mixer dry. If it gets wet, wipe it  
dry immediately.  
Your mixer requires a 250-volt, 0.5-amp fuse  
to protect it from power surges and short cir-  
cuits. If the mixer suddenly turns off or will  
not turn on, the fuse could be blown. Replace  
the fuse with a 0.5-amp, 250volt, fast-acting,  
11/4 x 1/4 inch fuse (not supplied).  
• Use and store the mixer only in normal  
temperature environments.  
• Handle the mixer gently and carefully.  
Do not drop it.  
Follow these steps to replace the fuse.  
• Keep the mixer away from dust and dirt.  
• Wipe the mixer with a damp cloth occa-  
sionally to keep it looking new.  
1. Using a Phillips screwdriver, unscrew  
the fuse compartment cap on the back  
of the mixer.  
Modifying or tampering with the mixer’s inter-  
nal components can cause a malfunction  
and might invalidate its warranty. If your mix-  
er is not performing as it should, take it to  
your local RadioShack store for assistance.  
2. Remove the old fuse and replace it with  
an identical fuse.  
Caution:  
Never use a fuse of a different  
type or rating.  
3. Replace the fuse compartment cap.  
ˆ Troubleshooting  
We do not expect you to have any problems with your mixer, but if you have a problem, this in-  
formation might help. If the problem persists, take the mixer to your local RadioShack store for  
assistance.  
Problem  
Possible Solution  
The mixer does not work.  
Check the AC power connection and make sure the AC outlet is  
“live.”  
Check the power connection to the rest of the system (amplifier/  
receiver, input sources, and so on).  
Check the fuse. See “Replacing the Fuse” on Page 14.  
TALKOVER  
OFF  
No signal from an audio input  
sources.  
Make sure the  
switch is set to  
.
Check the mixer’s and the source’s control settings.  
Check the connection between the mixer and the input source.  
Make sure the turntable’s ground wire (usually black or green) is  
You are getting a hum from the  
PHONO sources.  
GND  
connected to the  
screw on the back of the mixer.  
14  
Care  
 
32-3008.fm Page 15 Thursday, April 6, 2000 4:03 PM  
Problem  
Possible Solution  
LINE  
You are getting a hum from other Make sure there are no low-level inputs connected to the  
input source jacks.  
input  
You are getting feedback noise. Move the microphone further away from the output speakers or use  
a unidirectional microphone.  
ˆ Specifications  
Input Sensitivity/Impedance  
DJ MIC (XLR jack) ............................................................. 1.5 mV, 600 ohms, Balanced/Unbalanced  
AUX MIC (Phone jack) ....................................................................... 1.5 mV, 600 ohms, Unbalanced  
Phono ......................................................................................................................... 3 mV/50 kOhms  
Line ........................................................................................................................ 150 mV/27 kOhms  
Output Level  
Main Out ......................................................................................................................... 2V/10 kOhms  
Record .................................................................................................................... 150 mV/10 kOhms  
Send ....................................................................................................................... 150 mV/10 kOhms  
Frequency Response ................................................................................................ 20–20k Hz ±3 dB  
S/N Ratio  
Mic ............................................................................................................................................... 55 dB  
Phono .......................................................................................................................................... 65 dB  
Line ............................................................................................................................................. 75 dB  
Distortion  
Mic .............................................................................................................................................. 0.20%  
Phono ......................................................................................................................................... 0.08%  
Line ............................................................................................................................................ 0.05%  
Tone Control, DJ MIC, AUX, CH 1, CH 2, CH 3, CH4  
HIGH Boost/Cut Range .............................................................................................. ±10dB at Center  
MID Boost/Cut Range ................................................................................................ ±10dB at Center  
BASS Boost/Cut Range ............................................................................................. ±10dB at Center  
ECHO Delay Time .............................................................................................................. 50 –120ms  
TALKOVER Attenuation ................................................................................................... –8 to –38 dB  
Power Source ......................................................................................................... AC 120V, 60Hz, 20 Watt  
Power Fuse ..................................................................................................................... 0.5 Amp/250 Volts  
Dimensions (HWD).................................................................................................... 4 7/16 × 19 × 11 Inches  
(113 × 482 × 280 mm)  
Weight ......................................................................................................................................... 11 Ibs 6 oz  
(5.15 kg)  
Specifications are typical; individual units might vary. Specifications are subject to change and improve-  
ment without notice.  
15  
Specifications  
 
32-3008.fm Page 16 Thursday, April 6, 2000 4:03 PM  
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 limitations on how long an implied warranty lasts or the exclusion or limita-  
tion of incidental 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, 200 Taylor Street, 6th Floor, Fort Worth, TX 76102  
We Service What We Sell  
12/99  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
32-3008  
04A00  
Printed in China  
 

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