Inverted Polarity Correction Question

That will work if it's your only source, but really all you have to do is run your speaker cable from the positive terminal on the amp to the negative terminal on the speaker, and negative to positive.

I can reverse phase on my cdp, but I used to keep it positive for reference and switch the cables instead when I had a preamp like yours (AIM3a). Some cds sound better to me reversed (in a completely unscientific eyes wide open no controls subjective assessment).

The answer that Paulwp gave above is correct and to the point!

Keep it simple Socrates. . .just reverse right and left interconnects from preamp to amp and you should be good to go!