Radio Shack MPA-50 owner manual Fm Page 11 Friday, February 11, 2000 1136 AM

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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.

Speakers

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Contents MPA-50 40-Watt PA Amplifier Contents Features Placing the Speakers Presetting ControlsPreparation Choosing a LocationMaking Connections Determining Total Speaker Impedance SpeakersSpeaker Phasing Connecting Speakers One Speaker Speakers in Parallel Series and Parallel Combined Multiple Speakers with Transformers Fm Page 11 Friday, February 11, 2000 1136 AM Controls and Operation Troubleshooting Replacing the Fuse CarePhono SpecificationsRadioShack