Radio Shack SSM-1750 User Manual

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SSM-17504-Channel

Stereo Audio Mixer

Owner’s Manual

Please read before using this equipment.

 

 

 

 

 

 

 

 

 

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ˆ Contents

 

Features ..................................................................................................................................

4

Preparation .............................................................................................................................

6

Presetting the Controls ......................................................................................................

6

Connecting the Outputs ....................................................................................................

6

Connecting Inputs .............................................................................................................

6

Connecting Microphones ...........................................................................................

7

Connecting Power .............................................................................................................

7

Connecting a Lamp ...........................................................................................................

7

Connecting Headphones ...................................................................................................

7

Listening Safely .........................................................................................................

7

Operation ................................................................................................................................

7

Presetting the Input Signal Levels .....................................................................................

8

Presetting the Channel Inputs ...................................................................................

8

Presetting a Microphone ............................................................................................

9

Presetting the Auxiliary Input .....................................................................................

9

Mixing the Inputs .............................................................................................................

10

Playing One Input Source ........................................................................................

10

Monitoring a Second Input Source ...........................................................................

10

Switching to the Second Input Source .....................................................................

11

Notes on Mixing .......................................................................................................

11

Using the Special Controls ..............................................................................................

11

Using the Tone Controls ...........................................................................................

11

Using Gain ...............................................................................................................

11

Setting the Sound Balance ......................................................................................

12

Using a Microphone ........................................................................................................

12

Using an XLR Microphone .......................................................................................

12

Using an AUX Microphone .......................................................................................

12

Using TALKOVER ....................................................................................................

12

Using MUTE LEVEL ................................................................................................

12

Using PAN ................................................................................................................

12

Using SOUND EFFECTS ................................................................................................

12

Using ECHO EFFECTS ..................................................................................................

12

Adjusting the Echo Delay, Repeat, and Volume ......................................................

13

Using Sound Effect Devices ............................................................................................

13

Playing the Signal from the Sound Effect Device ....................................................

13

Playing Input Signals through the Sound Effect Device ...........................................

13

©2000 Tandy Corporation. All Rights Reserved.

RadioShack and RadioShack.com are trademarks used by Tandy Corporation.

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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 uninsulated dangerous voltage within the product’s enclosure that might be of sufficient magnitude to constitute 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.

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ˆ Features

Your RadioShack 4-ChannelStereo Audio Mixer is a sophisticated control center, 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 and its wide-rangevolume 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.

1DJ MIC — lets you connect a balanced, low impedance microphone with an XLR plug.

2BASS/MID/HIGH let you adjust the tone of the selected input for customized sound.

3GAIN — individual controls let you fine tune each input’s volume.

4PAN — lets you control the output of the

DJ MIC and AUX MIC/LINE.

5LEVEL — lets you adjust the microphones' volumes before mixing them in.

6TALKOVER — decreases the volume of the input sources so you can talk over them using the microphone.

7MUTE LEVEL— lets you adjust the background music volume when using TALKOVER.

8CH1, CH2, CH3, CH4 Slide Volume Controls— for fingertip control of sound mixing and fading.

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Features

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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9Assign Controls— let you select the input sources to be mixed.

10CROSS FADER — lets you smoothly switch between two input sources.

11SOUND EFFECT — let you create a special sound performance using the six preprogrammed sound effects.

12CUE LEVEL — lets you adjust the headphone's volume.

13CUE ASSIGN — lets you select the channel where the desired audio input source is located so you can monitor and prepare it before mixing it in.

14BALANCE lets you adjust the sound balance between the left and right speakers.

15MASTER — adjusts the overall volume of

DJ MIG, AUX, CH1, CH2, CH3, CH4, RECEIVEinput, and sound effects.

16MONO/STEREO Selector — lets you set the output to stereo or monaural.

17POWER turns the mixer on and off.

18Lamp Jack — lets you install a 12V/3W lamp to light up the mixer controls.

19ECHO Controls — let you tailor the sound to compensate for a location’s conditions or for personal preference.

20VU (Volume Unit) — two meters indicate the total stereo output signal levels.

21Stereo Line Outputs — let you connect the mixer's output to your receiver/amplifier and tape deck so you can play the sounds from your input sources through your speaker system, and record them.

22Sound Effect Jacks — let you connect 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.

23Stereo Line Inputs — let you connect most line-level audio sources such as a

CD player, tape deck, tuner, camcorder, or VCR.

24Auxiliary Microphone Input — lets you

connect a low impedance microphone with a 1/4-inchplug.

25Stereo Phono Inputs — for connecting low-level audio sources, such as a turntable with a magnetic cartridge.

26Mono Line Input — lets you connect a mono input source, such as a wireless microphone receiver.

Features

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OUTPUT REC L
OUTPUT AMP L

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ˆ Preparation

PRESETTING THE

CONTROLS

Warning: A sudden high output from the mixer could damage your hearing, especially if you use headphones, and might also damage the audio devices connected to the mixer's output. Before using the mixer, make sure you set your receiver/amplifier's volume control to its minimum volume level setting.

Before you connect the power cord, make sure you set POWER to off. To avoid sudden 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.

CONNECTING THE

OUTPUTS

To play the mixer's output signal through your sound system (for events such as parties, dances, conferences, and so on), connect one end of an audio patch cord (not supplied) to the mixer's

(white) and R (red) jacks, then connect the other end to your receiver/amplifier's left and right input jacks, matching left to left, and right to right.

To record the mixer's output signal, connect one end of an audio patch cord (not supplied) to the mixer's (white) and R (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.

CONNECTING INPUTS

You can connect up to ten audio input sources (such as cassette tape decks, CD players, tuners, two magnetic-cartridgeturntables, a camcorder or a VCR) to the mixer’s input jacks on the back panel. You can also connect microphones to the appropriate jacks on the top and back panels.

1.Connect the line-leveloutputs from up to six audio sources to theLINE 1,LINE2,

LINE 3, LINE 4, LINE 5, and LINE 6input jacks, matching left to left, and right to right.

Caution: Do not connect an audio source with a line-level output to the low-level PHONO 1, PHONO 2, or AUX MICaudio input jacks.

2.Connect the low-leveloutputs from up to two audio sources (such as magnetic cartridge turntables) to thePHONO 1 andPHONO 2 input jacks, matching left to left, and right to right.

Note: If you connect magnetic cartridge turntables, connect their ground wires (usually black or green) toGND.

3.Connect a sound effect device (such as an echo reverb or a digital sampler processor) to the EFFECT SEND (output) andEFFECT RECEIVE (input) jacks, 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.

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Preparation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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12V/3W MAX LAMP
• After you put on the headphones, adjust CUE LEVEL to a comfortable listening volume level.
• 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.
4. Preset the input signal levels (see “Presetting the Input Signal Levels” on Page 8).
5. Mix the audio input sources (see “Mixing the Inputs” on Page 10).
AUX MIC
DJ MIC

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Connecting Microphones

You can connect two microphones (not supplied) to the mixer.

Connect a microphone with an XLR plug to on the top panel’s upper left corner.

Connect a microphone with a 1/4-inch(6.35 mm) plug to on the back panel’s lower right corner.

CONNECTING POWER

Note: Before you connect the mixer's power cord, make sure power is turned off by pressingPOWER (if the control is out, the power is off).

Connect the power cord to a standard AC outlet.

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!

CONNECTING A LAMP

The mixer has a socket for connecting a 12V/3W BNC lamp so you can see the control panel in dark or low light conditions.

CONNECTING

HEADPHONES

To listen in privacy or monitor the audio source inputs so you can locate an exact passage or section before mixing it, connect a pair of stereo headphones (not supplied) with a 1/4-inch(6.35 mm) plug to thePHONES jack on the mixer's lower right corner.

Your local Radio Shack store carries a wide selection of headphones.

Listening Safely

Do not listen at extremely high volume levels. Extended, high-volumelistening can lead to permanent hearing loss.

To protect your hearing when you use headphones, always follow these guidelines to set the listening volume.

Set CUE LEVEL to0 before you begin listening.

ˆ Operation

1.Set the volume levels on the output devices (receiver, amplifier, or tape deck) to minimum and turn them on.

2.Press POWER to turn on the mixer. The POWER indicator lights.

3.Turn on the input sources you want to mix.

Operation

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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 press POWER so it pops up to turn off the mixer. The POWER indicator turns off.

PRESETTING THE INPUT SIGNAL LEVELS

To avoid accidentally over-drivinga channel or prematurely mixing in an audio input source, start with the following settings:

All volume slide controls set to 0.

Both ASSIGN switches set toOFF.

All GAIN knobs set mid level.

All HIGH, MID, and BASScontrols, CUE LEVEL, DJ MIC LEVEL, AUX LEVEL, SEND, RECEIVE, and MASTERset to 0.

Rotate MASTER clockwise and temporarily set it to about the 5th marker.

Note: TheMASTER volume control adjusts the overall volume ofDJ MIC,AUX,CH1,CH2,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 never move into the red range (0 or above). Distortion is likely to occur on audio peaks if the meter moves into the red range.

For monaural output, set MONO/STEREO toMONO. For stereo output, set it toSTEREO.

Presetting the Channel Inputs

Follow these steps to preset each channel input you plan to mix.

Notes:

If you did not connect an input source to 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.

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 listening level (not necessarily the final usable level).

Do not play a quiet portion of music while you adjust the volume levels, otherwise the volume levels for channels 1, 2, 3, and 4 will be over-drivenduring the loud portions of the music.

1.Set the channel selector to the desired input source.

2.Start playback of the selected input source.

3.Adjust the HIGH,MID, andBASS controls as desired. See “Using the Tone Controls” on Page 11.

Note: If you are using an external equalizer, leave the tone controls set to0 and adjust the tone on the external equalizer.

4.Slowly slide up the channel volume control until you get a reading of up to 0 on both VU meters.

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.

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Operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Notes:

If it was necessary to set the channel volume level slide control to 10 to get a reading of up to0 on the VU meter, then slide it down to about8 and adjust theGAIN control to get a reading of up to0 on the VU meters. (See “Using Gain” on Page 11.)

If the above does not work, set GAIN to mid level and rotateMASTER clockwise until you get a reading of0 on the VU meters.

Readjusting MASTER affects the level of the previously set input sources. You must readjust those sources until you get a reading of up to0 on the VU meters for each input source.

5.Stop playback of the selected input source.

6.Repeat these steps for each channel input you plan to mix.

Presetting a Microphone

1.If your XLR or auxiliary microphone has an ON/OFF control, set it to ON.

If your XLR or auxiliary microphone does not have an ON/OFF control, set

DJ MIC LEVEL or AUX LEVELto 0.

2.While talking continuously, adjust DJ MIC LEVELor AUX LEVELuntil you get a reading of up to 0on both VU meters. (See “Using an XLR Microphone” on Page 12 and “Using an AUX Microphone” on Page 12.)

Important: Note the DJ MIC LEVELor AUX LEVELsetting, so each time you want to mix the microphone, you can set the control to the correct setting.

Notes:

If it was necessary to set DJ MIC LEVEL orAUX LEVEL all the way to10 in order to get a reading of up to0 on the VU meter, then turn it down to about8 and adjust theDJ MIC GAIN control to get a reading of up to0 on the VU meters. (See “Using Gain” on Page 11.)

If that does not work, set DJ MIC GAIN orAUX GAIN to mid level and rotateMASTER clockwise until you get a reading of0 on the VU meters.

If you must readjust MASTER, remember, doing so affects the level of the previously set input sources. You must readjust those sources until you get a reading of up to0 on the VU meters for each input source.

3.If your XLR or auxiliary microphone has an ON/OFF control, set it to OFF.

If your XLR or auxiliary microphone does not have an ON/OFF control, set

DJ MIC LEVEL or AUX LEVELto 0.

Presetting the Auxiliary Input

1.To preset the AUX LINE input source, set

AUX to LINE.

2.Start playback of the selected input source.

3.Adjust the HIGH,MID, andBASS controls as desired. See “Using the Tone Controls” on Page 11.

Note: If you are using an external equalizer, leave the tone controls set to0 and adjust the tone on the external equalizer.

4.Slowly adjust AUX LEVEL until you get a reading of0 on both VU meters.

Operation

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AUX LEVEL

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Important: Note the setting, so each time you want to mix that source you can set the control to the correct setting.

Notes:

If it was necessary to set the AUX LEVEL control to10 to get a reading of up to0 on the VU meter, then setAUX LEVEL to about8 and adjust theAUX GAIN control to get a reading of up to0 on the VU meters. (See “Using Gain” on Page 11.)

If the above does not work, set AUX GAIN mid level and rotateMASTER clockwise until you get a reading of0 on the VU meters.

Readjust MASTER affects the level of the previously set input sources. You must readjust those sources until you get a reading of up to0 on the VU meters for each.

5.Stop playback of the selected input source.

MIXING THE INPUTS

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.

Monitoring the next input source.

Switching to the next input source.

You can start with either of the two selected sources.

To prevent prematurely mixing audio sources, set all volume level controls to 0.

To avoid sudden and inaudible sound outputs from any audio devices that you connect to the mixer, be sure to set their power controls to off and any tone controls to flat.

Playing One Input Source

1.Set ASSIGN A to the desired source, then setCROSS FADER toA.

2.Select the mixer's input — CH 1,CH 2,

CH 3, or CH 4.

3.Set the input selector control to the input source you want to play first through your sound system.

4.Adjust the receiver's or amplifier's (not the mixer's) volume control to the desired volume.

Make sure the first input source's volume level slide control is set to the correct preset position.

5.Start playback of the input source.

Monitoring a Second Input Source

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 volume level of the source currently playing.

1.Connect and put on headphones.

Note: You can listen to one channel through the headphones while the other channel is playing through the sound system.

2.Set ASSIGN B to the second input source.

3.Set CUE ASSIGN to the audio input source (CH 1,CH 2,CH 3, orCH 4) you want to monitor.

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Operation