Radio Shack MPA-50 - Manual (Page 11)

11 Speakers
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
Ω
). 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.
32-2002.fm Page 11 Friday, February 11, 2000 11:36 AM