Radio Shack 32-2057 User Manual

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3-ChannelStereo Sound Mixer

Thank you for purchasing your 3-ChannelStereo 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

quick start guide

Please read this user’s guide before installing, setting up and using your new product

The Basics




important safety instructions


setting up your mixer ......................


using your mixer .............................


mixing your inputs.........................


using a microphone .......................


frequently asked questions ............




specifications ................................



The Basics


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 abuilt-ininstallation 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,


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 — Routepower-supplycords 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-supplycord or plug is damaged.


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.


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.


The Basics connecting inputs

MIC — connect a microphone with a


-inchplug here (not supplied).









PHONO 1/2 — connect up to twolow-levelaudio



sources (turntable) to your mixer. If you connect



a magnetic-cartridgeturntable, connect its



ground wire (usually black or green) to GND.




















































LINE 1, 2, 3, 4 — connect line level inputs from up to four audio sources to your mixer. Do not connect audio sources withline-leveloutputs to thePHONO 1 orPHONO 2 input jacks.

connecting power

Connect the mixer’s power cord to a standard AC outlet.


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 a1/4-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-volumelistening 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 theCUE LEVEL setting. Over time, your ears adapt to the volume level.


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, andCH 3 set to0.

CUE LEVEL set to 0.

MIC TREBLE and MIC BASSset to 0.



















































































































































































MASTER set to about5.

For monaural output, set MONO/STEREO toMONO.

For stereo output, set MONO/STEREO toSTEREO.


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


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 to0 on the mixer’s LED meters.

5.Stop playback of the selected input source.

6.Repeat steps 2-5to presetLINE 1 toCH 1,PHONO 2 andLINE 2 toCH 2, andLINE 3 andLINE 4 toCH 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.









































CH 1

CH 2

CH 3