Preamp inverts phase question:

Your question was not entirely clear, which may partially account for some of the complicated answers. When you say that your preamp is "phase-inverting," do you mean that it has a control switch or button that lets you go back and forth from normal phase to phase inverting? I suspect that that is what you mean, though your question could be interpreted as meaning that your preamp is always phase inverted. Assuming that you have a switch or button on the preamp and/or remote control that lets you toggle between phase and phase-inverted, then don't reverse the speaker wires. Connect amp positive to speaker positive, and amp negative to speaker negative. Then, when playing music, you can toggle back and forth to see if you prefer normal phase or phase inverted. Many people can't hear a difference, though you may be one who can. In all probability, your problem is really a non-problem, despite some of the replies to your question. Something of a complication might enter if you connected your sources, preamp, and amp in balanced mode (XLR connectors) and some of your electronics are American (pin 2 non-inverting or positive) and some of your electronics are German or Japanese (pin 2 inverting or negative). In that case, your electronics would be out of phase. There are various ways of restoring phase in such cases.

Victor Khomenko of BAT claims that 50% of recordings are recorded out of absolute phase. If true, it would make your question a mute point.
However, I would switch the + and - leads at the amplifier end, as I have done in my situation. My preamp also inverts polarity, and the manufacturer (VAC) recommends switching the leads at the amplifier instead of at the speaker terminals.

You can always experiment on your own, and no damage will be done.

Cheers,
John

Kusina,
My preamp is always phase inverted; no switches to go back and forth to switch phases. It is a Joule Electra LA-150 MK2.
Regards,

Adam

Most think that inverted and non inverted options on preamp is for switching back and forth for certain recording, although one can do this and it can have an affect, this is not the true nature of what it is for.

It is about matching components!
If your preamp is inverted then you should be (in a perfect world) using an amp that is non inverted.
Like wise if your using a preamp that is non inverted, then you want an amp the is inverted.

When there is a mismatch that is when reversing the speaker wires will solve the problem.

On some systems it will be noticeable on others, not so much. I have found when setup properly it can affect sound stage and bass, listen to female vocals will have more depth as well.

Benie, again, since many discs are recorded in mixed polarity and the rest are half "normal" and half "inverted," I don't think your argument holds water. On the mixed discs, the polarity setting doesn't matter ( although I have discs where I can pop the vocalist out front with one polarity setting and push him back into the mix with the other). Only a polarity switch or speaker cable switching will "fix" the others. The electronics are basically inconsequential. And the speakers -- the way they're wired internally -- are key to whether the effect is audible or not.