Better do what the manual says. Who cares if you can't hear it. I have a Cary SLP98P and if have to reverse the wires on my speakers. Why take a chance of damaging or ending the life of something earlier than necessary?
Preamp inverts phase question:
The owners manual of my preamp indicates that the preamp inverts phase: the circuit is phase inverting. Does this mean that I need to hook my speaker cables up backwards to correct the phase inversion... do I hook the positive speaker cable to the negative speaker binding post and visa versa with the negative speaker cable connections on both speakers?