Inverted Amplifiers

If your amp inverts and your pre doesn't just reverse the lead as E. suggests above, red to black etc. This leaves the whole question of recordings which are made with reversed polarity ; my DAC has a reversal switch and occasionally it makes a considerable difference. Most of the time it does not.

My RELs instructions indicate that this is best set by ear, in my case out of phase sounded better. The Sumiko site has their set up guide for subs which is simple and helpful.