Eldartford,
Receivers that have configured to use jumpers between pre-out and amp-in usually run with amp disconnected thus cannot be used in bi-amplification.
The skillfull tech should just connect a pair of RCA without disconnecting an input to the amplifier i.e. in-parallel.
Receivers that have configured to use jumpers between pre-out and amp-in usually run with amp disconnected thus cannot be used in bi-amplification.
The skillfull tech should just connect a pair of RCA without disconnecting an input to the amplifier i.e. in-parallel.