Audio Output

FSpeaker receptacle — This 4-pole, 5 mm screw lock captive screw receptacle is used to connect the amplifier to the speakers.

With an 8 ohm load, the amplifier produces up to 8 watts per channel. With a 4 ohm load, the amplifier produces up to 15 watts per channel.

8Ω / 4Ω

CLASS 2 WIRING

	OUTPUT
L	R

See the attention (page 5) and note (page 5) for important information about connecting wires to captive screw connectors.

ATTENTION: Do not short the + and – outputs to each other, as this will damage the amplifier.

Captive

Screw

Left RCA

TRS

Captive

Screw

-
+	+
	Stereo
	+
	+
	+
	+
	Dual
	Mono
	+
-	+
+	+
	+

Right

RCA

TRS

Stereo

Amp Stage

Stereo/Dual Mono Switch

Figure 7. MPA 152 Plus Summing Diagram

Signal flow is as follows:

1.The MPA 152 Plus sums and weights the left unbalanced signals from the TRS and RCA receptacles. This summed, unbalanced signal is then summed with the left balanced signal from the captive screw receptacle.

2.The right channel is handled in the same way.

3. The left and right channels are then sent to the output amplifiers in one of two ways, depending on how the front panel switch is set.

•Stereo: The left and right channels are sent to the left and right output amplifers respectively.

•Dual Mono: The left and right channels are summed and then the resulting mono is fed to both of the output amplifiers.

The captive screw, RCA, and TRS inputs are buffered.

MPA 152 Plus • Panels and Cabling