MMS-20  (250-1109)             Installation            Faxback Doc. # 3303

The Radio Shack MMS-20 Multimedia Amplified Speaker System with 5-Band
Equalizer has been specifically designed to enhance your computer's audio.
You can set the MMS-20 to automatically mix your computer's audio with an
additional audio source, or to switch between two sources so you can
create custom presentations.  The 5-band equalizer helps you customize the
sound.  The MMS-20 features two tweeters and one woofer to provide
excellent sound, and its wide frequency response makes it great for voice
or music.

You can connect a pair of optional stereo speakers to enhance the sound,
or you can connect a pair of optional stereo headphones to listen in
privacy.

SETTING UP

You can place the MMS-20 between your computer's CPU and monitor.

The MMS-20 safely supports up to 50 pounds, and its rubber feet hold it in
place without slipping.

CONNECTING TO SOUND SOURCES AND POWER

Depending on your computer's output jacks, you need either a shielded
audio cable (Radio Shack Cat. No. 42-2351) or a Y-cable (Cat. No. 42-2475)
to connect the MMS-20.  For assistance in selecting the correct cable,
consult your local Radio Shack store or participating dealer.

Note:  We recommend that you connect your MMS-20 to your computer's line
       level output jacks, if available.

       Follow these steps to connect the MMS-20 to your computer, to an
       additional audio source, and to power.

Caution:  Before you begin, be sure to turn off the power to all your
          computer's components.

Note:  If you are connecting an additional audio source, you will need an
       appropriate cable.

1.  Plug the audio cable's left channel plug into the MMS-20's INPUT A,
    L terminal.  Then plug the audio cable's right channel plug into the
    MMS-20's INPUT A, R terminal.

2.  Plug the audio cable's other end into your computer's stereo output
    jack.

3.  If you want to connect an additional audio source, plug the left and
    right channel plugs of an additional audio cable into the MMS-20's
    INPUT B, R and L terminals.  Connect the audio cable's other end to
    the audio source.

Note:  Adding an auxiliary audio source lets you mix sound from two
       sources, such as a CD player and a CD ROM voice presentation.  If
       you are using a computer with enhanced sound, you can connect both
       your computer's sound board and a music card.

4.  Plug the power cord into a standard AC outlet or approved power strip.

CONNECTING EXTERNAL SPEAKERS

You can connect a pair of 8-ohm or 4-ohm external speakers to the MMS-20.

Notes:  We recommend that you use the shortest length of speaker wire
        possible.

        For the best overall performance, be sure that your speaker wires
        are properly connected according to their polarity
        (+ to + and - to -).

Follow these steps to connect external speakers to the MMS-20.

1.  Split apart 4 inches of the speaker wire.

2.  Remove about 1 inch of insulation from each wire's end, then twist the
    exposed wire to secure all of the wire strands.

3.  Press and hold the EXTERNAL SPEAKER 4 ohm OR 8 ohm R's negative (-)
    terminal tab and insert the right speaker's negative (-) wire  into
    the opening.  Then release the tab.

4.  Press and hold the EXTERNAL SPEAKER 4 ohm OR 8 ohm R's positive (+)
    terminal tab and insert the right speaker's positive (+) wire into the
    opening.  Then release the tab.

5.  Repeat Steps 1 through 4 to connect the left speaker's wires.

CONNECTING HEADPHONES

You can connect a pair of stereo headphones with a 1/8-inch plug
(not included) to the MMS-20 to listen in privacy.  Your local Radio Shack
store carries a wide selection of stereo headphones.

To connect headphones, insert the 1/8-inch plug into the speaker system's
jack.

Note:  Connecting headphones automatically disconnects the built-in and
       external speakers.

Listening Safely

To protect your hearing, follow these guidelines when you use headphones.

    Set the volume to the lowest setting before you begin listening.
    After you begin listening, adjust the volume to a comfortable level.

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

    Once you set the 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.

(br/all-11/3/94)