Radio Shack 3-Channel Stereo Sound Mixer User guide

32-2057
3-Channel Stereo Sound Mixer
Thank you for purchasing your 3-Channel Stereo Sound
Mixer from RadioShack. Your mixer is perfect for mixing
sound from multiple audio sources, such as microphones,
tuners, CD players, or turntables. You can adjust each audio
source’s sound level for the best mix to play through your
sound system, or for recording. This mixer is ruggedly
constructed for home or professional use.
what’s included
stereo mixer
user guide
Please read this user’s guide before installing,
setting up and using your new product
www.radioshack.com
quick start guide
The Basics
contents
important safety instructions ............3
setting up your mixer ...................... 6
using your mixer ............................. 9
mixing your inputs ......................... 13
using a microphone ....................... 15
frequently asked questions ............ 17
care ............................................... 18
specifications ................................ 19
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 — Do not use this appliance near water (for
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 — Slots and openings in the cabinet provide 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 — Operate this appliance only with the power
source indicated. If you are not sure of your home’s power type,
consult your appliance dealer or power company.
Polarized Power Cord Plug — This appliance is equipped with a
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,
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 — An outside antenna system should not be located
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 — The power cord of the appliance should be
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:
* When the power-supply cord or plug is damaged.
4
The Basics
* 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 — When replacement parts are required, be
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 — The product should be mounted to a
wall or ceiling only as recommended by the manufacturer.
5
The Basics
setting up your mixer
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 REC L/R — use an audio patch cord (not supplied) to connect
your tape deck’s line input jacks to your mixer (match left to left,
right to right). You can then record the mixer’s output.
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
MIC — connect a microphone with a
1
/4-inch plug here (not supplied).
PHONO 1/2 — connect up to two low-level audio
sources (turntable) to your mixer. If you connect
a magnetic-cartridge turntable, connect its
ground wire (usually black or green) to GND.
GND
LINE 1, 2, 3, 4 — connect line level inputs from up to four audio
sources to your mixer. Do not connect audio sources with line-level
outputs to the PHONO 1 or PHONO 2 input jacks.
connecting power
Connect the mixer’s power cord to a standard AC outlet.
7
The Basics
connecting a lamp and headphones
12V/3W MAX LAMP — connect a 12V DC/3W BNC lamp (not supplied)
to light up the mixer’s controls.
PHONES — connect a pair of stereo headphones (not supplied) with a
1
/4-inch (6.35 mm) plug. You can then listen and locate a section of
music to mix.
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 source’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 and mix your audio input
sources. Refer to the next two sections for details.
5. When you are finished, turn off all connected audio
sources (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:
CH 1, CH 2, and CH 3 set to 0.
MIC TREBLE and MIC BASS set to 0.
CUE LEVEL set to 0.
POWER
ASSIGN A and ASSIGN B set to OFF.
MASTER set to about 5.
For monaural output, set MONO/STEREO to MONO.
For stereo output, set MONO/STEREO to STEREO.
9
The Basics
presetting audio input sources
Before mixing your audio sources (devices connected to
LINE 1, PHONO 1, PHONO 2, LINE 2, LINE 3, LINE 4), you must set their
input signal level to each channel input (CH1, CH2, CH3). You do
not have to mix every connected input source.
1. To preset the PHONO 1 input source, set PHONO 1/LINE 1 to
PHONO 1.
2. Play the selected input source.
3. Adjust the volume on your headphones or receiver to a
comfortable listening level.
4. Slowly adjust CH1 until you get a reading of up to 0 on the
mixer’s LED meters.
5. Stop playback of the selected input source.
6. Repeat steps 2-5 to preset LINE 1 to CH 1, PHONO 2 and LINE 2
to CH 2, and LINE 3 and LINE 4 to CH 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.
PHONO 1/LINE 1
PHONO 2/LINE 2
CH 1
CH 2
10
LINE 3/LINE 4
CH 3
The Basics
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 or less on the LED meter, slide CH 1 down to about 8 and
adjust MASTER upward until you get a reading of 0 on both
LED meters.
presetting the microphone
1. Turn on your microphone.
2. Set OFF/ON/TALKOVER to ON.
3. While talking, adjust DJ MIC until you get a signal reading
of up to 0 on both LED meters.
4. Set OFF/ON/TALKOVER to OFF.
MIC — connect a microphone
with an XLR plug here
OFF/ON/TALKOVER
MASTER —adjusts overall
volume of sources connected
to DJ MIC, CH1, CH2, and CH3.
DJ MIC — adjusts volume of
the microphone connected to
the MIC jack.
11
Beyond the Basics
sound check
1. Select an input source to play.
2. Adjust its volume (CH control) to its preset signal level (see
“presetting input signal levels” on Page 9). The mixer’s
LED meters should read 0dB or less.
3. Adjust your receiver/amplifier’s volume to an appropriate
level for the location or event where the mixer will be
used.
4. Adjust the LEFT CHANNEL and RIGHT CHANNEL frequency controls
to your preference (see “using the seven band equalizer”
on page 15). If this causes the LED meters to exceed 0dB,
adjust MASTER downward until their readings return to 0dB.
Adjust your output device’s volume accordingly.
12
Beyond the Basics
mixing your 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,
correspond to CH 1, CH 2, CH 3).
2. Slide CROSS FADER all the way to A.
PHONO 1/LINE 1
PHONO 2/LINE 2
CROSS FADER
ASSIGN A and ASSIGN B
LINE 3/LINE 4
CUE LEVEL
CUE
CUE/PGM
3. Set PHONO 1/LINE 1, PHONO 2/LINE 2, or LINE 3/LINE 4 to the preset
input source you are going to play first.
4. Adjust the input source’s volume to it’s preset signal level
(see “presetting input signal levels” on Page 9).
5. Play the source.
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, correspond
to CH 1, CH 2, CH 3).
3. Press CUE (next to the second input source’s CH control).
4. Set PHONO 1/LINE 1, PHONO 2/LINE 2, or LINE 3/LINE 4 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. When you reach the desired section of music to mix, stop
or pause play.
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
Your mixer has a set of tone controls for the microphone so
you can tailor its high and low frequency sounds.
1. For regular sound, leave MIC TREBLE and MIC BASS set to 0.
2. Rotate MIC TREBLE toward +10 to increase, or toward –10 to
decrease high frequency sounds.
3. Rotate MIC BASS toward +10 to increase, or toward –10 to
decrease low frequency sounds.
MIC TREBLE
MIC BASS
using talkover
When you are not using your microphone, set OFF/ON/TALKOVER
to OFF. The microphone’s input is turned off and all other
audio input sources are unaffected.
1. To use your microphone, set OFF/ON/TALKOVER to ON. The
microphone sound is mixed equally with the other audio
input sources.
15
Beyond the Basics
2. Set OFF/ON/TALKOVER to TALKOVER so that the microphone’s
sound is louder than the other audio input sources. This
is useful for paging.
using the seven band equalizer
The seven band equalizer controls, LEFT CHANNEL and RIGHT
CHANNEL, further tailor the frequency for CH 1 (PHONO1, LINE 1), CH
2 (PHONO2, LINE 2), and CH 3 (LINE 3, LINE 4) to match your acoustic
surroundings or to suit your personal preference.
LEFT CHANNEL
RIGHT CHANNEL
EQ
1. To activate the equalizer, press EQ. The EQ LED lights.
2. Slide the LEFT CHANNEL and RIGHT CHANNEL controls for a
selected frequency to +12dB to boost, or toward –12dB to
cut the frequency’s sound.
To provide smooth frequency control, the equalizer’s controls
must overlap slightly. Thus, the 1K control has a slight effect
on the range of frequencies covered by the 400Hz and 2.4K
controls.
16
Beyond the Basics
frequently asked questions
Q - I set up my mixer according to the instructions. Why isn’t
it working?
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 OFF/ON/TALKOVER is not set to TALKOVER.
- 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.
17
Beyond the Basics
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.
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, 11/4 x 1/4 inch fuse (not supplied).
1. Disconnect power from
the mixer.
2. Use a Philips screwdriver
to remove the fuse
compartment cap.

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.
18
Beyond the Basics
specifications
Input Sensitivity/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 ..................................................................................... 2V/10 kOhms
Record ................................................................................. 150 mV/10 kOhms
Frequency Response .............................................................20–20K Hz ±3dB
S/N Ratio (for 1 kHz):
MIC .............................................................................................................60dB
PHONO...................................................................................................... 70dB
LINE ........................................................................................................... 80dB
Distortion:
MIC ..........................................................................................................0.20%
PHONO.................................................................................................... 0.07%
LINE ......................................................................................................... 0.05%
Tone Control (MIC):
TREBLE .................................................................................................. ±10dB
BASS ...................................................................................................... ±10dB
Equalizer Control:
Control Frequencies ............................ 60, 150, 400, 1k, 2.4k, 6k, and 15k Hz
Boost/Cut Range ................................................................ ±12dB from center
Talkover Attenuation ............................................................................. –16dB
Power Source ..............................................................AC 120V, 60Hz, 20Watt
Dimensions .................................................................19 x 38/1 x 97/16 Inches
(482 x 79 x 240 mm WHD)
Weight ................................................................................... 9.92 lbs (4.5 kgs)
Specifications are typical; individual units might vary. Specifications are
subject to change and improvement without notice.
19
accessories
Depending on how you plan to use your mixer, some or all
of the following items may be purchased separately:
audio patch cord
microphone with an XLR plug
microphone with 1/4-inch plug
stereo headphones
12V lamp bulb
limited one-year warranty
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
04/04
Printed in USA
32-2057
07A04
©2004. RadioShack Corporation.
All rights reserved. RadioShack and RadioShack.com are
trademarks used by RadioShack Corporation.