Radio Shack SM-1000 User Manual

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32-3001.fmPage 1 Tuesday, August 10, 1999 8:02 AM

Cat. No. 32-3001

OWNER’S MANUAL

Please read before using this equipment.

SM-1000

Audio Mixer with Echo (Rack Mount Type)

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FEATURES

Your Radio Shack SSM-1000Audio Mixer with Echo is a sophisticated control center for recording from multiple playback sources such as a CD player, tuner, turntable, or VCR, or from live performances. A seven band equalizer and an echo effect are incorporated into the mixer so you can tailor the sound to compensate for environmental conditions or for personal preference. The mixer’s many features give you almost limitless sound combinations.

Its features include:

7-BandFrequency Equalizer— allows you to tailor the sound output to your preference.

Two Pairs of Stereo PHONO Inputs

— for using turntables with either magnetic or ceramic cartridges.

Stereo Line Inputs — let you connect most high level audio sources, such as a tape deck, amplifier, tuner, or VCR.

Low-NoiseTape Out Jack— for high-quality tape recording.

Slide Controls — for fingertip control of sound mixing and fading adjustments.

Monitor Controls — let you hear and check line inputs using headphones before mixing.

Normal/Standby/Talkover Switch — lets you control when you talk with music, talk over music, or talk without interrupting the music or being heard through the mixer, to give you a “DJ’s” control.

Phono 1/Phono 2 Fader Control — allows you to quickly and smoothly switch between playing PHONO 1 and PHONO 2.

Monitoring Controls — lets you listen to the outputs of MIC, PHONO 1, PHONO 2, LINE 1, LINE 2, or MASTER through headphones.

To obtain best performance of your audio SSM-2200Mixer, please read this manual carefully before you connect it to other audio components.

For your important records, we recommend you record this unit’s serial number in the space provided. You’ll find the serial number on the bottom of the unit.

Serial Number:

©1995 Tandy Corporation. All Rights Reserved.

Radio Shack is a registered trademark used by Tandy Corporation.

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CONTENTS

 

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

4

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

4

Connecting Inputs and Presetting Levels .........................................................

4

Pre-Adjustingthe Monitor Levels ......................................................................

5

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

6

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

7

Basic Operation ................................................................................................

7

Using The “DJ’s” Microphone............................................................................

8

Normal ........................................................................................................

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Talkover ......................................................................................................

8

Standby ......................................................................................................

8

Using Echo........................................................................................................

8

Using the 7-BandFrequency Equalizer ............................................................

9

Troubleshooting ..................................................................................................

10

Care and Maintenance ........................................................................................

11

Specifications ......................................................................................................

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Warning: To prevent fire or shock hazard, do not expose this mixer 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 SERVIC-

ING TO QUALIFIED PERSONNEL.

This symbol is intended to alert you to the presence of uninsulated dangerous voltage within the mixer’s enclosure that might be of sufficient magnitude to constitute a risk of electric shock. Do not open the mixer’s case.

This symbol is intended to inform you that important operating and main-

!tenance instructions are included in the literature accompanying this mixer.

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PREPARATION

CONNECTING THE

OUTPUTS

Connect your amplifier and a cassette recorder to the audio output jacks on the back of the mixer.

(illus - show the left and right output jacks.)

1.Connect the amplifier’s left and right input jacks to the mixer’s MAIN OUT output jacks to play the mixer’s sound.

2.Connect the tape recorder’s left and right input jacks to the mixer’s TAPE OUT output jacks to record the mixer’s sound.

CONNECTING INPUTS AND PRESETTING LEVELS

Connect your audio sources (AM/FM tuners, CD players, cassette decks, or phonograph players) to the audio input jacks on the back of the mixer.

1.Connect the AC power cord to a standard AC outlet.

2.Before turning on the power:

Set MIC, PHONO 1, PHONO 2, LINE 1, and LINE 2to 0.

Set NORMAL/STANDBY/TALKOVERto STANDBY.

Set MONITOR LEVEL fully counterclockwise to minimum.

Set EQUALIZER BYPASS/ONto BYPASS.

(illus)

3.Set POWER OFF/ONto ONto turn on the mixer’s power. The VU meters and the power indicator lights.

4.Connect a high-qualitymicrophone with a1/4-inchplug to theMIC terminal.

Note: This is the remote (guest) microphone.

5.Set MIC main volume control to5.

(illus - show the left and right input jacks.)

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Note: You can set the control to any other position (except0). However, to get an accurate preset, all the volume controls must set to the exact same position.

(illus)

5.While you use the microphone, insert a flat bladed screwdriver into the slot above the corresponding volume control and adjust it until you obtain a reading of 0 on the OUTPUT LEVELVU meters.

(illus)

6.Temporarily set the MIC main volume control to0.

7.Repeat Steps 4 through 7 to connect and adjust the preset levels of all your other audio input sources.

Notes:

Do not connect the high-level outputs of an audio source to the lowlevel PHONO CERAMIC 2

(ceramic) jacks.

Except for the PHONO ceramic inputs, you can connect any highlevel audio source (tuner, cassette tape deck, CD player, magneticcartridge turntable, or VCR) to any set of input jacks.

Connect the ground wires (usually black or green) from your magnetic cartridge turntable to the GND screw terminal on the back of the mixer.

PRE-ADJUSTINGTHE MONITOR LEVELS

To listen in privacy or monitor the audio source inputs so you can locate an exact passage or section before mixing it into the MAIN OUTPUT, insert a pair of stereo headphones (not supplied) equipped with a1/4-inchplug into thePHONES jack on the lower left front corner of the mixer. Your local Radio Shack store sells a wide selection of headphones.

(illus)

1.Set the volume control of the input sources to be monitored to their minimum settings.

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2.Set MONITOR toMIC to select the remote microphone.

(illus)

Note: The DJ’s microphone input cannot be monitored.

3.Set MONITOR LEVEL to approximately halfway between minimum and maximum.

(illus)

4.Adjust the volume control of the input source you selected until you hear the signal in the headphones at the desired level.

Caution: Be careful not to accidentally slide up the main volume control of the monitored source before you are ready to put it “on the air.”

5.Repeat Steps 1 through 4 to select and preadjust the monitor volume level of the rest of the audio input sources (PHONO 1,

PHONO 2, LINE 1, or LINE 2) you want to monitor.

To monitor an audio input source, simply select the desired MONITOR switch and useMONITOR LEVEL to adjust the volume as desired.

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Listening Safely

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

Follow these guidelines to protect your hearing, especially when you use headphones.

Always start by setting the volume to the lowest level possible before you begin listening. Put the earphone or headsets on, then gradually increase the volume as necessary.

Once you set the volume, do not increase it. Over a period of time, your ears adapt to the volume level, so a volume level that does not cause discomfort might still damage your hearing.

Caution: As you begin to mix, be careful not to get into the habit of always increasing volume levels to achieve the proper balance. You can bring high levels down just as easily as bring low levels up. Try to keep the independent level controls in the middle position (3 to8), and adjust the overall volume with theMASTER volume control as well as the volume control of your input audio equipment. Listening at excessive volume levels will soon give you ‘’tired ears’’ and you won’t be as pleased with your finished product later.

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OPERATION

BASIC OPERATION

You can mix up to 6 inputs at the same time and use the built-inequalizer and echo generator to tailor the sound as desired.

1.Set MASTER to approximately5.

2.Set the switch above each volume control to select the input you want to activate. (For example, set MIC HI/LOW toHI when you use a high impedance microphone, orLOW when you use a low impedance microphone.

(illus)

3.Adjust the corresponding volume level control to obtain a reading of

0 on the OUTPUT LEVELVU meters.

Note: The OUTPUT LEVELVU meter indicates the output signal levels of the left and right channels.

4.Adjust MONITOR LEVEL clockwise to increase the main (DJ) microphone’s volume; rotate it counterclockwise to decrease the volume.

5.Set ECHO BYPASS/ONto ONto produce an ECHO effect and to BYPASSto eliminate the ECHO effect. (See “Using Echo.”)

6.Push in EQUALIZER BYPASS/ONto ONto operate the right and left 7-channel frequency equalizer controls. (See “Using the 7-Band Frequency Equalizer.”)

7.When two turntables (or other audio components connected to the PHONO 1 andPHONO 2 inputs) are playing at the same time, slide

FADER (PHONO 1/PHONO 2):

Left, to fade in the volume of PHONO 1 and fade out the volume ofPHONO 2.

Right, to fade in the volume of PHONO 2 and fade out the volume ofPHONO 1.

Note: This lets you quickly and smoothly change from playing

PHONO 1 to playing PHONO 2(or vice versa).

8.Set the MASTER volume to the desired volume.

9.Set POWER OFF/ONto OFFto turn off the mixer’s power. The VU meters lights go off.

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USING THE “DJ’S”

MICROPHONE

Normal

For equal blending of voice and music, set NORMAL/STANDBY/TALKOVERto NORMAL. In the NORMALmode, the “DJ” MICinput is mixed to blend equally with all the main volume inputs (MIC, PHONO 1, PHONO 2, LINE 1, and

LINE 2). You can adjustLEVEL to increase or decrease the microphone level without affecting the main volume inputs.

Talkover

Start with a microphone level that gives a VU reading of 5 to3.

To talk over music, set NORMAL/ STANDBY/TALKOVERto TALKOVER.

The mixer automatically reduces all the main volume inputs (MIC, PHONO 1, PHONO 2, LINE 1, and LINE 2) just enough for you to hear yourself in the headphones or speakers (over the music).

When you finish speaking, set NORMAL/STANDBY/TALKOVERto STANDBY. The mixer automatically returns all the main volume inputs to their original levels.

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Standby

To disable the MIC INPUTmicrophone, set NORMAL/STANDBY/TALKOVERto STANDBY.

Note: SetMIC LEVEL to minimum (full counterclockwise) when the microphone is not in use.

USING ECHO

The echo mode is applied to the sound after all the inputs are mixed.

Set ECHO BYPASS/ON toON to turn on the echo mode and activate theDELAY andREPEAT functions. SetECHO BYPASS/ON toBYPASS to turn off the echo mode.

The DELAY control lets you induce a measured time delay to simulate an echo. SetDELAY to full counterclockwise for a minimum (0) time delay and to full clockwise for a maximum time delay.

The REPEAT control lets you control the length of time a tone is repeated (reverberation). SetREPEAT to10 for the longest time and to 0 for the shortest time.

(illus)

EQUALIZER BYPASS/ON

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USING THE 7-BANDFREQUENCY EQUALIZER

With the seven sliding frequency controls, you can tailor the sound processed through the mixer to fit the acoustic surroundings and your personal taste.

Each control varies by ±12 dB the level of a narrow band of frequencies centered around the frequency noted between the controls (60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz, 6 kHz, and 15 kHz).

Set the

switch to ON to turn on the frequency equalizer. Then slide the control up to boost the indicated frequency range or down to reduce it.

Notes:

If you set the control to the center position, the frequency range is unaltered.

In order to provide smooth frequency control, the effect of these controls must overlap slightly. Thus, the 1 kHz control has a slight effect on the range of frequencies covered by the 400 Hz and the 2.4k Hz controls.

Frequency

Purpose

 

 

 

 

60 Hz

Adjusts the frequencies in the low bass range (low organ notes

 

and bass drums). Reduces rumble or other low-frequencynoise

 

 

150 Hz

Adjusts the frequencies in the low to middle bass range (low

 

organ notes, bass drums, timpani and some low-bass)

 

 

400 Hz

Adjusts frequencies in the middle-bassrange (timpani and

 

some low-bassinstruments)

 

 

1 kHz

Adjusts the range of frequencies in the middle frequency range

 

where the ear is most sensitive (vocals).

 

 

2.4 kHz

Adjusts the range of frequencies in the upper middle frequency

 

range that include vocals and some upper-midrangeinstru-

 

ments (clarinet and saxophone)

 

 

6 kHz

Adjusts the range of frequencies in the lower high frequency

 

range that include some vocals and upper-midrangeinstru-

 

ments (clarinet and saxophone).

 

 

15 kHz

Adjusts high-frequencysounds (cymbals, flutes, and violins).

 

 

 

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TROUBLESHOOTING

Your SSM-1000Mixer should require very little maintenance. If you do have problems, refer to the troubleshooting chart below for possible solutions.

Caution: Only a qualified service technician should perform repairs on this SSM1000 Mixer!

Problem

Solution

 

 

 

 

 

Check the AC power connection.

 

 

Nothing works

Make sure the AC outlet is ‘’live’’.

 

 

Check the power connections to the rest of the system

 

(amplifier/receiver, etc.)

 

 

No signal from an

Check the control setting.

 

Check the connections between the mixer and the input

audio input source.

 

source.

 

 

Hum from PHONO

Connect the turntable’s ground wire (usually black or

 

green) to one of the GND screws on the back of the

 

mixer.

 

 

Hum from other

Make sure there are no low level inputs connected to the

inputs

LINE 1 and 2 jacks.

 

 

Feedback “squeals”

Move the microphone farther away from the output

 

speakers or use a directional microphone.

 

 

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