Per the PE BASH 300 amp manual, you have 3 connection options:
"1) Line Level Inputs For connection to a full-range stereo line level signal, use the left and
right line level inputs; the on-board low-pass crossover will be in effect.
"2) For connection to
the subwoofer out on a home theater receiver, use either the LFE input to bypass the
internal crossover or the Left or Right input for additional crossover flexibility
"3) Hi Level Inputs Allows the connection of the amplifier to a speaker level output from a
stereo amplifier or receiver"
Listen to what they say, and don't say. I see nothing about the high level inputs (#3) being filtered, in fact, I see no sign of a high-pass circuit in the amp, just an adjustable low pass for the sub. And yes, I have one. It's flexible, but there's a heirarchy to the connections:
- high level input allows you to add bass to any signal, but all you do is add bass modified by the on-board amp crossover controls; no affect on L/R signal.
- low level input allows you to add bass to a more advanced amp featuring line level outputs, not just speaker terminals, but without bass management so on-board controls are again required. Again, no affect on L/R signal.
- bass management in the AVR so the sub circuits are bypassed and the BASH 300 is just an amp, but your system is now bass managed with speakers high-passed and sub low passed to match. .
If you have an AVR with an LFE line level output, connect that to the LFE input and the AVR and Audyssey will do what you expect. The only reason you would fall back to line level or high-level inputs is if the LFE path wasn't available.