a-them AVM 90 Operating Manual page 23

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).