Radio Shack MPA-50 Stereo Amplifier User Manual


 
11Speakers
Cautions:
Before you connect the speakers, be sure the total wattage of the primary taps
you intend to use does not exceed the amplifier’s maximum 40-watt output power
rating.
Avoid multiple connections to the amplifier’s
70V
and
COM
terminals.
Follow these steps to make the connections.
1. Connect a wire from the amplifier’s
70V
terminal to each transformer’s primary
tap that matches your speaker’s wattage rating. For example, if you will be con-
necting a 2.5-watt speaker to a transformer, connect this wire to the 2.5 tap on
that transformer’s primary side.
2. Connect a wire from the amplifier’s
COM
terminal to the COM tap on each trans-
former’s primary side.
3. Connect a wire from the speaker’s positive (+) terminal to each transformer’s
secondary tap that matches the speaker’s total impedance (4, 8, or 16 ). For
example, if you are connecting an 8-ohm speaker to a transformer, connect this
wire to the 8 tap on that transformer’s secondary side.
4. Connect a wire from the speaker’s negative (–) terminal to the COM tap on each
transformer’s secondary side.
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