Phase inverted preamps and Rel Subwoofers.

I have come to realize that my preamp is a “phase inverted” preamp.  This basically means that most recordings will sound better when you reverse the positive and negative wires on the back of your speaker terminals.  Since doing this my amp is getting hot.  I have Rel subs hooked to the terminals of the amp the normal way.  Could this cause the heat? Should or (can I) reverse the subs positive and negative positions on the (amp) along with the the speaker wires as well?  In this case the speakers positive and negative would be changed back the traditional way.