Speaker Connections

FSpeaker receptacle (see figure 2) — Connect the speakers to the speaker receptacle using the

2-pole, 5 mm screw-lock captive screw connector (MPA 401-100V shown at right).

100V OUTPUT

CLASS 2 WIRING

OUTPUT

100V

NOTES:

•The mono audio speaker receptacle may be labeled in one of two ways (see the diagrams above). The wiring and function are the same whichever way the product is labeled.

•The MPA 401 amplifier sums the left and right signals from both the TRS and RCA inputs to form Sum 1. Sum 1 is then weighted. At the same time, the amplifier sums the left and right signals from the captive screw input to form Sum 2. Sum 1 and Sum 2 are then summed together to form a single mono signal. See figure 6 below for more details.

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

L
RCA
R
	+
	Sum 1
	+
3.5 mm L
TRS R	+

+	Amp Stage

Captive	L	+	+	Sum 2

		-
Screw	R +		+
		-

Figure 6. Summing MPA 410 input signals to form a single mono output signal

The MPA 401‑70V provides up to 40 W for a 70 V line distributed sound system; the MPA 401‑100V provides up to 40 W for a 100 V line distributed sound system.

See the attention and the note on page 6 for important information about connecting wires to captive screw connectors.

ATTENTION: Do not ground or short the speaker outputs as this will damage the amplifier.

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling