There are a number of threads on reversing polarity. There is something called Woods Effect that some hear when polarity is reversed. Many people don't hear it. Whether a component (this is not unique to pre-amps -- amps, DACs, etc can reverse polarity, and things can be recorded with reversed polarity) reverses polarity just has to do with how the circuitry is implemented.
Connect my amp out of phase?
My new preamp, AES / Ary AE-3 DJH says "connect your amplifier out of phase when using this preamp. The output of the AE-3 is inverting. Connect your speaker wire out of phase (+) to (-) and (-) to (+)." Is the only thing that I need to connect differently, the speaker cable?