phase control on BAT VK pre amps

"My son and I both noted the exact moment of reversal, different days, no prior discussion. I own a number of recording(CDs and vinyls) that I have marked for reverse phase playback. As Ralph mentioned; there are many more in which no differences will be noticed."

Keep in mind that the Chesky CD is made for demos. Most likely, they selected tracks that emphasize whatever quality they want you to hear.

"Keep in mind that the Chesky CD is made for demos. Most likely, they selected tracks that emphasize whatever quality they want you to hear." GEE, Ya think? Chesky recorded those tracks, and reversed the phase, to demonstrate the Wood Effect, and enable one to see if they can discern it. That WAS the point!

" I own a number of recording(CDs and vinyls) that I have marked for reverse phase playback."

If you can hear the differences, why mark them? Are you sure you're not dealing with psycho acoustics here? It seems likely that you wouldn't know the difference if the albums weren't pre marked for you.

Same reason I have some vinyls marked as to optimum tone arm height/VTA: I only have to reverse the phase of a recording once, to determine whether it's worth reversing or not. I may not remember the best phase, if I don't play that recording again, for 6 months, a year....

So basically if you don't have a phase switch on your preamp like I do on the BAT you may never know the difference anyway and are confined to listen to whichever way the recording was produced because there's no other way to switch phase other than swapping polarity on your speaker cables!? I'll just keep the phase switch on so I can see pretty blue light :-)