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
The focus seems to be on preamps, but I'll ofer that the Marantz SA11-S2 and SA7-S1 SACD/CD players have a polarity switch. They are excellent palyers for the money too.
The Tube Audio Design TADAC has polarity switches for each channel. It helps that it's a wonderful tube output DAC with adjustable gain and "tubyness" control.
One of the first preamps to have the invert feature was the original Atma-Sphere MP-1 (1989). It is the one signal processing feature that we have on our preamps (easy enough to do since our preamps are internally fully balanced).
Spectron Audio power amplifiers and pre-amplifiers have this feature on EACH CHANNEL separately - extremely useful

Rafael