Radio Shack MPA-125 Benutzerhandbuch

12

Connections

Follow these steps to connect speakers using a transformer.

Connect a wire from 

 on the back of

the amplifier to the transformer’s desired pri-
mary tap (10, 5, 2.5, 1.25 or 0.62 watts).

Note: Usually, each speaker in a system
uses the same wattage tap. If you want a
particular speaker to have a higher volume
level, connect the wire from 

 to a

higher wattage tap on the transformer.

Connect a wire from 

 on the back of the

amplifier to the 

 (common) taps on the

transformer’s primary side.

Connect a wire from the speaker’s positive
(+) terminal to the transformer’s secondary
tap that matches the speaker’s total imped-
ance (4 ohms, 8 ohms, or 16 ohms).

Connect a wire from the speaker’s negative
(–) terminal to the 

 (common) tap on the

transformer’s secondary side.

To connect the amplifier to power, plug its
power cord into a standard AC outlet.

Your amplifier’s fuse (located on the amplifi-
er’s back panel) protects the amplifier from
voltage surges. If the PROTECTION indica-
tor does not light when you press 

(see “Using Your Amplifier” and “Safety Indi-
cators” on Page 13), check the fuse. If it is
blown, see “Replacing the Fuse” on Page 17.

Press in 

 to turn on the amplifier.

Start the input sound source.

Rotate 

 to its mid-position.

One at a time, adjust 

, 

, 

, 

, and 

 to the desired volume

and balance.

Note: If you hear feedback after you adjust
these controls, turn 

 clock-

wise until the noise disappears (see “Using
the Feedback Filter” on Page 14).

After you get the desired balance, adjust

 to the desired volume lev-

el.

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