Owner's Manual

RCA Pre-Amp Outputs—Using External Amplifiers
The pre-amp outputs, which are variable according to the main zone volume control, are used to connect external
amplification. The addition of external amplifiers allows you to supplement or replace internal amplification. This set of
connections includes subwoofer outputs.
With MRX 740, external amplification is necessary to add additional back and height effects channels.
With MRX 540, external amplification is necessary to add back and height effects channels.
Balanced XLR Pre-Amp Outputs (AVM Only) —Using External Amplifiers
Balanced XLR connection offers the highest analog transmission quality, particularly over long cable lengths because
it rejects noise and hum pickup. These outputs are provided using the conventional pin-2 positive configuration.
With the AVM models, the RCA and XLR outputs have identical signals at the same time (XLR connections are suitable
for longer cables).
RCA and Balanced XLR Pre-Amp Outputs—Connecting Subwoofers
The pre-amplifier outputs include subwoofer outputs. Although subwoofers are considered to be speaker channels,
they are generally self-amplified and, thus, connect in the same way you’d connect an external amplifier. Your AVM/
MRX features two subwoofer outputs (the AVM 90 features four). Each sub output has its own position delay, level,
and Anthem Room Correction filter, however they all receive the same signal which is the LFE + low-pass portions of
small speakers on other channels (MRX540 and 740 have paralleled subwoofer outputs). There is also a mode where
front left and right channels are set to large (full range) and the low-pass of left and right channels is also added to
the subwoofer.