what’s included
32-2058
4-Channel Audio Mixer
with 3 Band EQ Controls & Echo
Your RadioShack 4-Channel Audio Mixer with 3 Band EQ
Controls & Echo is perfect for mixing sound from multiple
playback sources such as a microphone, tuner, CD player,
turntable, or the audio output from a VCR. It is ruggedly
constructed for home or professional use. Its volume
controls let you adjust sound for playing through your
speaker system or for recording.
Thank you for purchasing your 4-Channel Audio Mixer from
RadioShack.
mixer user’s guide quick start guide
Please read this user’s guide before installing,
setting up and using your new product
www.radioshack.com
The Basics
contents
connections ............................................... 6
using your mixer ...................................... 9
mixing inputs ......................................... 13
using a microphone ................................
using the special controls .......................
using echo .............................................. 18
frequently asked questions
replacing the fuse ................................... 21
specifications ........................................... 22
....................20
15
16
2
The Basics
IMPORTANT SAFETY INSTRUCTIONS
Read Instructions — All safety and operating instructions should be
read before the appliance is operated.
Retain Instructions — The safety and operating instructions should
be retained for future reference.
Heed Warnings — Follow all warnings on the appliance and in the
operating instructions.
Cleaning — Unplug this appliance from the wall outlet before
cleaning. Use only a damp cloth for cleaning. Do not use liquid or
aerosol cleaners.
Water and Moisture
example, near a bathtub, washbowl, kitchen sink, or laundry tub; in
a wet basement; or near a swimming pool).
Mounting Accessories — Do not place this appliance on an
unstable cart, stand, tripod, bracket, or table. The appliance may
fall, causing serious injury to a child or adult, and serious damage
to the appliance. Use only with a cart, stand, tripod, bracket,
or table recommended by the manufacturer or sold with the
appliance. Follow the manufacturer’s instructions for mounting, and
use a recommended mounting accessory.
Ventilation
ensure reliable operation, and protect from overheating. Do not
block or cover these openings, and do not place the appliance on a
bed, sofa, rug, or other similar surface. Do not place the appliance
in a built-in installation such as a bookcase or rack unless it
provides proper ventilation as specified by the manufacturer.
Heat — The appliance should be situated away from heat sources
such as radiators, heat registers, stoves, or other appliances
(including amplifiers) that produce heat.
Power Sources
source indicated. If you are not sure of your home’s power type,
consult your appliance dealer or power company.
Polarized Power Cord Plug
polarized power cord plug (a plug having one blade wider than the
other). This plug will fit in the power outlet only one way. This is
a safety feature. If you cannot insert the plug fully into the outlet,
— Slots and openings in the cabinet provide ventilation,
— Do not use this appliance near water (for
— Operate this appliance only with the power
— This appliance is equipped with a
3
The Basics
try reversing the plug. If the plug still doesn’t fit, contact your
electrician to replace your obsolete outlet. Do not defeat the safety
purpose of the polarized plug.
Power-Cord Protection — Route power-supply cords so they are
not likely to be walked on or pinched by items placed on or against
them, paying particular attention to cords at plugs, convenience
receptacles, and the point where they exit from the appliance.
Cleaning — The appliance should be cleaned only as
recommended by the manufacturer. Wipe it with a cloth slightly
dampened with water. Avoid getting water inside the appliance.
Power Lines
in the vicinity of overhead power lines or other electric light or
power circuits, or where it can fall into such power lines or circuits.
When installing an outside antenna system, extreme care should be
taken to keep from touching such power lines or circuits as contact
with them might be fatal.
Nonuse Periods
unplugged from the outlet when the appliance is to be left unused
for a long period of time.
Overloading — Do not overload wall outlets, extension cords, or
integral convenience receptacles, as this can result in a risk of fire
or electric shock.
Objects and Liquids — Never push objects of any kind into this
appliance through openings, as they may touch dangerous voltage
points or short out parts that could result in a fire or electric shock.
Never spill liquid of any kind on the appliance.
Carts and Stands — If the appliance is used with a cart or stand,
the cart/stand type should be recommended by the manufacturer.
An appliance and cart combination should be moved with care.
Quick stops, excessive force, and uneven surfaces cause the
appliance and cart combination to overturn.
Mounting — The appliance should be mounted only as
recommended by the manufacturer.
Damage Requiring Service — Unplug this appliance from the wall
outlet and refer servicing to qualified service personnel under the
following conditions:
— An outside antenna system should not be located
— The power cord of the appliance should be
4
The Basics
* When the power-supply cord or plug is damaged.
* If liquid has been spilled or objects have fallen into the appliance.
* If the appliance has been exposed to rain or water.
* If the appliance does not operate normally by following the
operating instructions. Adjust only those controls that are
covered by the operating instructions, as an improper adjustment
of other controls may result in damage and will often require
extensive work by a qualified technician to restore the appliance
to normal operation.
* If the appliance has been dropped or damaged in any way.
* When the appliance exhibits a distinct change in performance.
Servicing — Do not attempt to service this appliance yourself, as
opening or removing covers may expose you to dangerous voltage
or other hazards. Refer all servicing to qualified service personnel.
Replacement Parts
sure the service technician has used replacement parts specified by
the manufacturer or have the same characteristics as the original
part. Unauthorized substitutions may result in fire, electric shock or
other hazards.
Safety Check — Upon completion of any service or repairs to this
appliance, ask the service technician to perform safety checks to
determine that the appliance is in proper operating condition.
Lightning — For added protection for this product during a
lightning storm, or when it is left unattended and unused for long
periods of time, unplug it from the wall outlet. This will prevent
damage to the product due to lightning and power line surges.
Attachments — do not use attachments not recommended by the
product manufacturer as they may cause hazards.
Wall or Ceiling Mounting
wall or ceiling only as recommended by the manufacturer.
— When replacement parts are required, be
— The product should be mounted to a
5
The Basics
connections
A sudden high output from the mixer could damage your
hearing or damage the audio devices connected to your
mixer. Before connecting to AC power, turn off your mixer
and all audio devices connected to your mixer.
connecting outputs
OUTPUT AMP L/R — use an audio patch cord (not supplied) to connect
your receiver or amplifier to your mixer (match left to left, right to
right). The sound is output to your stereo sound system.
OUTPUT AMP L/R — use an audio patch cord (not supplied) to connect
your receiver or amplifier to your mixer (match left to left, right to
right). The sound is output to your stereo sound system.
6
The Basics
connecting inputs
LINE 1, 2, 3, 4, 5, 6 — connect up to six audio
sources to your mixer. Do not connect
audio sources with line-level outputs to
the PHONO 1, PHONO 2, or AUX MIC jacks.
EFFECT SEND/RECEIVE — connect a
sound effect device to EFFECT SEND
(output) and EFFECT RECEIVE (input).
PHONO 1/2 — connect up to two low-level audio
sources to your mixer. If you connect a magneticcartridge turntable, connect its ground wire to GND.
AUX LINE MONO — connect a
mono input source here.
AUX MIC — connect a
microphone with a
1
/4-inch plug here.
connecting power
Connect the mixer’s power cord to a standard AC outlet.
GND
7
The Basics
connecting a lamp, headphones and mic
DJ MIC — connect a microphone
with an XLR plug here.
PHONES — connect a pair of stereo headphones
(not supplied) with a 1/4-inch plug. You can then
listen and locate a section of music to mix.
12V/3W MAX LAMP — connect a 12V
DC/3W BNC lamp (not supplied) to
light up the mixer’s controls.
listening safely
Do not listen at extremely high volume levels. Extended,
high-volume listening can lead to permanent hearing loss.
To protect your hearing when using headphones, always
follow these guidelines to set the listening volume:
• Set CUE LEVEL (headphones volume) to minimum before
putting on your headphones.
• After you put on the headphones, adjust CUE LEVEL to a
comfortable listening level. Do not increase the CUE LEVEL
setting. Over time, your ears adapt to the volume level.
8
The Basics
using your mixer
1. Set your output device’s volume to minimum and turn it
on.
2. Press POWER to turn on the mixer.
3. Turn on the audio input sources you want to mix.
4. Preset the input signal levels (see “presetting input signal
levels”).
5. Mix the audio input sources (see “mixing the inputs” on
Page 13).
6. When you are finished, turn off all connected audio
devices (amplifiers, tape decks, and so on), and press
POWER to turn off the mixer.
presetting input signal levels
To avoid overdriving a channel or prematurely mixing an
audio input source, adjust your mixer to these settings:
1. Rotate MASTER clockwise about halfway.
2. Press MONO/STEREO in for monaural output. Press again for
stereo output.
3. The mixer’s LED meters show total stereo output level.
For best results, input signal levels should be set so the
meters read 0db or less.
9
The Basics
All HIGH, MID, and BASS controls to 0.
All GAIN controls set midway
between MIN and MAX.
DJ MIC LEVEL and AUX LEVEL to 0.
CH1, CH2, CH3, and CH4 to 0.
SEND ASSIGN and CUE ASSIGN to OFF.
SEND, RECEIVE, and MASTER
set to 0.
CUE LEVEL to 0.
presetting audio inputs
Before mixing your audio sources (devices connected to LINE
1, PHONO 1, PHONO 2, LINE 2, LINE 3, LINE 4, LINE 5, LINE 6), you must set
their input signal level to each channel input (CH1, CH2, CH3,
etc.). You do not have to mix every connected input source.
1. Set the channel selector to the desired input source.
2. Play the selected input source.
3. Adjust HIGH, MID, and BASS as desired. See “using the
special controls” on Page 18. If you are using an external
equalizer, leave the controls set to 0 and adjust the tone
on the external equalizer.
4. Adjust the volume on your headphones (CUE LEVEL) or
receiver to a comfortable listening level.
10
The Basics
5. Slowly slide up the channel volume control (CH) until you
get a reading of up to 0 dB on both LED meters.
6. Stop playback of the selected input source.
7. Repeat steps 1-7 for each audio input you plan to mix.
Notes:
• Write down the CH setting for each audio source. Then,
when you want to mix that source, you can adjust its
volume to that setting.
• If it was necessary to set CH 1 to maximum to get a
reading of 0 dB or less on the LED meter, slide CH 1 down to
about 8 and adjust MASTER upward until you get a reading
of 0 dB on both LED meters. If that does not work, set
GAIN midway and rotate MASTER clockwise until you get a
reading of 0 dB on the LED meters.
presetting microphone(s)
1. If your microphone has an ON/OFF control, turn it ON.
Otherwise, set DJ MIC LEVEL or AUX LEVEL to 0.
DJ MIC LEVEL AUX LEVEL
11
The Basics
2. While talking, adjust DJ MIC LEVEL or AUX LEVEL until you get a
reading of less than 0 dB on both LED meters. See “using
an XLR microphone” on Page 16.
Notes:
• Write down the DJ MIC LEVEL or AUX LEVEL setting. Then, when
you want to mix with the microphone, you can adjust it to
this setting.
•
If it was necessary to set DJ MIC LEVEL or AUX LEVEL to 10 in
order to get a reading less than 0 dB on the LED meter,
adjust either one to 8 and adjust DJ MIC GAIN to get a
reading less than 0 dB on the LED meters. See “gain” on
Page 18.
•
If the above suggestion does not work, set DJ MIC GAIN or
AUX GAIN to about 5 and rotate MASTER clockwise until you
get a reading less than 0 dB. Remember that adjusting
MASTER affects the level of the previously set input sources.
You must readjust those sources accordingly.
12
Beyond the Basics
mixing inputs
You can select any two of your connected audio sources and
mix them so one or both play through your sound system.
Mixing consists of three parts: playing an input source,
monitoring a second input source, and switching to a second
input source.
playing an input source
1. Set ASSIGN A to the desired audio source (1, 2, 3, 4
correspond to CH 1, CH 2, CH 3, CH 4).
PHONO 1/LINE 1 PHONO 2/LINE 2 LINE 3/LINE 4 LINE 5/LINE 6
CROSS FADER
ASSIGN A and ASSIGN B
2. Slide CROSS FADER all the way to A.
3. Select the mixer’s input -- CH 1, CH 2, CH 3, or CH 4.
4. Set PHONO 1/LINE 1, PHONO 2/LINE 2, LINE 3/LINE 4, or LINE 5/LINE 6 to
the preset input source you are going to play first.
5. Adjust the input source’s volume to it’s preset signal level
(see “presetting input signal levels” on Page 10).
6. Play the source.
CUE ASSIGN
CUE LEVEL
13
Beyond the Basics
monitoring a second input source
Monitoring a second input source requires listening to an input
source, finding the desired audio section you want to mix, and
adjusting it’s sound level to match the volume of the first input
source (the one designated ASSIGN A).
1. Connect and put on headphones. You can listen to one
source through the headphones while the other source
plays over the sound system.
2. Set ASSIGN B to the second input source (1, 2, 3, 4 correspond
to CH 1, CH 2, CH 3, CH 4).
3. Set CUE ASSIGN to the audio input source (1, 2, 3, 4).
4. Set PHONO 1/LINE 1, PHONO 2/LINE 2, LINE 3/LINE 4, or LINE 5/LINE 6 to the
second input source.
5. Play the second input source.
6. Adjust the second input source’s volume (CH) to it’s
preset signal level. If using headphones, adjust CUE LEVEL
(headphones volume) to a comfortable listening level.
7. Stop or pause play when you reach the section of music to
mix.
switching to a second input source
1. Play the second input source.
2. When you are ready to hear it play on your sound system,
slide CROSS FADER from A to B.
3. Slide CROSS FADER to the left to fade in ASSIGN A (source one)
and fade out ASSIGN B (source two). Slide CROSS FADER to the
right to fade in ASSIGN B and fade out ASSIGN A. Slide
CROSS FADER to the center to equally mix the two.
• Do not slide CROSS FADER to the center when monitoring a
channel while another is playing. Instead, slide CROSS FADER to
the channel you are not monitoring. For example, to monitor
channel 1 (ASSIGN A) while channel 2 (ASSIGN B) is playing, slide
CROSS FADER to B.
14
Beyond the Basics
using a microphone
using an XLR microphone
To mix the XLR microphone with other audio input sources,
adjust DJ MIC LEVEL to increase or decrease microphone
volume. Set DJ MIC LEVEL to 0 when you are not using the DJ
microphone.
using the AUX microphone
To mix the AUX microphone with other audio input sources,
set AUX MIC/LINE to MIC. Adjust AUX LEVEL to increase or decrease
microphone volume. When you are not using the AUX
microphone, set AUX MIC/LINE to LINE. When set to LINE, you can
mix the output from the device connected to the AUX LINE MONO
jack.
using talkover
Press TALK OVER to reduce audio input sound so that the
microphone output is heard over the music. Rotate MUTE LEVEL
to adjust the background music volume while using talkover.
Press TALK OVER again to turn it off. All audio inputs, including
the microphones, play at the same output level.
PAN
To play either microphone or the AUX LINE output on the left or
right channel, adjust the DJ or AUX PAN control. Turn it to L to
play through the left channel, to R to play through the right
channel, or to any other position between L and R to balance
sound through both channels.
15
Beyond the Basics
using the special controls
tone
Your mixer has a set of tone controls for each microphone
and channels 1– 4. You can tailor the high, middle, and low
frequency sounds for each.
For normal sound, leave
Rotate HIGH, MID, or BASS toward +10 to increase, or toward –10
to decrease the high, middle, and low frequency sounds.
BASS, MID, and HIGH set to 0.
gain
Since the input level of each source is different, you can use
GAIN to fine tune each input’s volume. Rotate the desired GAIN
control toward MAX to increase the volume and toward MIN to
reduce it.
DJ MIC LEVEL AUX LEVEL
AUX MIC/LINE
BALANCE
MUTE LEVEL
TALK OVER
We recommend adjusting
since some sound imbalance could occur.
PAN
GAIN before presetting the inputs
16
Beyond the Basics
setting the sound balance
BALANCE lets you adjust the sound balance 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.
If the sound seems to be louder from one speaker, adjust
BALANCE
until the output sounds equally from both speakers.
17
Beyond the Basics
using echo
The mixer plays echo effects, and lets you adjust echo delay,
number of echo repeats, and the echo’s volume. The echo is
applied to the sound before all the inputs are mixed.
1. Set ECHO to MIC to apply the echo effect to the
microphones and AUX LINE input.
2. Set ECHO to MUSIC to apply the echo effect to the channel
outputs.
3. Set ECHO to OFF to turn off the echo effect.
adjusting echo delay, repeat, and volume
ECHO DELAY lets you adjust the time interval between echoes.
Set ECHO DELAY to 0 for minimum delay, and to 10 for maximum
time delay.
ECHO REPEAT
repeated (reverberation). Set ECHO REPEAT to 10 for the longest
time repeat and to 0 for the shortest.
ECHO LEVEL lets you adjust the echo output level. Rotate
ECHO LEVEL toward 10 to increase the echo level, and toward 0
to decrease it.
lets you control the length of time a tone is
playing the signal from the sound effect
device
To play signals from the device connected to the EFFECT jacks,
set RECEIVE to ON. Rotate RECEIVE to adjust the volume of the
device connected to the EFFECT jacks without changing the
sound effect device’s volume. Rotate RECEIVE toward 10 to
raise the volume and toward 0 to decrease it.
When you are not using the connected inputs, set RECEIVE to
OFF.
18
Beyond the Basics
playing input signals through the sound
effect device
You can play inputs selected by the channel selectors
(DJ MIC or AUX) through other sound effect devices connected
to the mixer, and control playback through the mixer. To play
selected inputs through the sound effect device, set
SEND ASSIGN to the selected input.
SEND lets you adjust the volume of the selected sound effect
device without changing the device’s volume. Rotate
SEND toward 10 to raise the volume and toward 0 to decrease
it.
19
Beyond the Basics
frequently asked questions
Q - I set up my mixer using the instructions. Why doesn’t it work?
A - Make sure you are connected to a “live” AC outlet.
- Verify that all sources are securely connected.
- Check the fuse and replace it if needed.
Q - Why is there no signal from my input source?
A - Make sure TALK OVER is turned OFF.
- Make sure the input source is turned on.
- Check the mixer and source control settings.
- Check connections between the mixer and input source.
Q - Why do I hear a humming noise from the PHONO source?
A - Make sure the PHONO 1 or PHONO 2 source’s ground wire is
connected to the mixer’s GND terminal.
Q - Why do I hear a humming noise from another input source?
A - Make sure there are no low-level inputs connected to the
mixer’s LINE input jacks.
Q - Why am I getting microphone feedback (squealing)?
A - Move the microphone further away from the output speakers
or use a directional microphone.
care
Keep the mixer dry; if it gets wet, wipe it dry immediately. Use and
store the mixer only in room temperature environments. Handle the
mixer carefully; do not drop it. Keep the mixer away from dust and dirt,
and wipe it with a damp cloth occasionally to keep it looking new.
service and repair
If your mixer is not performing as it should, take it to your local
RadioShack store for assistance. To locate your nearest RadioShack,
use the store locator feature on RadioShack’s website (www.
radioshack.com), or call 1-800-The Shack (843-7422) and follow the
menu options. Modifying or tampering with the mixer’s internal
components can cause a malfunction and might invalidate its warranty.
20
Beyond the Basics
replacing the fuse
The mixer uses a fuse for protection against surges and short
circuits. If the mixer suddenly turns off and will not turn on,
check the fuse. If necessary, replace it with a 0.5-amp, 250volt, fast-acting, 1
1. Disconnect power from the mixer.
2. Use a Philips screwdriver to remove the fuse
compartment cap.
1
/4 x 1/4 inch fuse (not supplied).
3. Remove the old fuse and insert a new one. Make sure you
replace the fuse only with another fuse of the same type
and rating.
4. Replace the fuse compartment cap.
5. Reconnect the mixer to power.
21
Beyond the Basics
Specifications
Input Sensitivity/Impedance
DJ MIC (XLR jack) .............. 1.5mV, 600 ohms, balanced/unbalanced
AUX MIC (Phone jack) ........................ 1.5mV, 600 ohms, unbalanced
Phono ........................................................................ 3mV/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 ........................................................................................... 0.08%
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
TALK OVER Attenuation ................................................. –8 to –38 dB
Power Source ............................................... AC 120V, 60Hz, 20-Watt
Power Fuse ...................................................................... 0.5A/250 V
Dimensions (HWD) .......................................... 47/16 x 19 x 11 inches
Weight .................................................................... 11.35 Ibs 182 oz.
Specifications are typical; individual units might vary. Specifications
are subject to change and improvement without notice.
(113 x 482 x 280 mm)
(5.15 kg)
22
Beyond the Basics
23
limited one year warranty
Depending on how you plan to use your mixer, some or all
accessories
of the following items may be purchased separately:
audio patch cord
microphone with an XLR plug (DJ mic)
microphone with 1/4-inch plug
stereo headphones
12V lamp bulb
This product is warranted by RadioShack against manufacturing defects in material and workmanship
under normal use for one (1) year from the date of purchase from RadioShack company-owned stores
and authorized RadioShack franchisees and dealers. For complete warranty details and exclusions, check
with your local RadioShack store.
RadioShack Customer Relations
200 Taylor Street, 6th Floor, Fort Worth, TX 76102
©2004. RadioShack Corporation.
All rights reserved. RadioShack and RadioShack.com are
trademarks used by RadioShack Corporation.
04/04
Printed in China
32-2058
07A04
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