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
Nearly all of the Balanced Audio Technology pre-amps have polarity inversion and feature a button on the remote for that as well. I know the VK-3i does NOT have the feature, but it's my understanding that every other pre-amp in their line does have switchable polarity (phase).
My older Klyne SK-5 preamp has a polarity invert position on the front panel. I don't know if the current models ( System 6 and System 7 ) have retained it.
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.