Reversing Polarity -- Voodoo or Easy Tweak?

I found a Sheffield Lab-5 vinyl LP of Dave Grusin, "Discovered Again" 1976, I had not listened to for years. I cleaned both sides put it on the TT platter for a listen. I first played both sides of the Lp to warm up the cartridge. Then I sat down for a listen. For 1976 it still sounds very good. I listened to both sides of the Lp and then focused in on Grusin's piano mainly. I then reversed the speaker cables at the speakers. Their was a difference in sound, but not overwhelming. Imo Grusin's piano did sound cleaner and more open, with a tad more air.

Jim

So what do you conclude?

Herman posted,
"Phase has to do with time, polarity has to do with whether a signal is going positive or negative. If a speaker is wired with the wrong polarity it will be going out when it should be going in, and vice versa. I have friend who claims he can tell when it is reversed because a vocalist will sound like they are gulping air instead of exhaling."

Herman puts it into words better than I can. I also agree with every thing he has said in this thread.

Recorded music is converted to electrical signal and that signal has polarity. With no signal being a base line with positive signal above the base line and negative signal below the base line. Positive signal will cause the coil of the speaker to move foward from a no signal state and negative signal will cause the speaker coil to pull back from a no signal state. So imo if the source signal for a given time is positive then the speaker, if the polarity is the same as the signal for the same given time, should move forward. Sorry if I do not say it as eloquent as Herman.

I was talking with my son the other day and I mentioned this thread. My son was the one that reminded me I had the Grusin LP. He told me that Frank Zappa recorded his music with reverse signal polarity.

Question why would any one record music reversing the signal polarity deliberately?

"Perhaps to give their music a distinctive and uniquely different sound."

I thought of that but in the case Of Grusin LP there is this statement;

Audiophile Note: "For optimum transient response and spartial clarity, we recommend that the polarity of BOTH channels be reversed at the speaker terminals(+ output terminal on power amplifier to - terminal on speaker and vice versa), however this procedure is not necessary for for perfectly satisfactory playback."