Radio Shack MPA-50 owner manual Cautions

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

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.

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