Looking for Polarity Invert Feature...


Does anyone know of a decent preamp, stand-alone CD player, or DAC that has a polarity invert feature? It seems to be fairly uncommon, but I need that feature (along with good sound) if I can get it. It's important that I be able to simply push a button rather than changing the speaker leads all the time.

Thank you for any suggestions!
plato
Guys, thanks, I appreciate the responses so far. I forgot to mention that I'm looking for RCA outputs as well.

I think some of the Audio Research preamps have the polarity invert feature, but I can't recall which models.
What does polarity inversion do to the sound? I have a Chesky test CD that contains a phase inversion track. I cannot hear any differences?

What am I missing?