Modwright SWL 9.0SE Preamplifier

Holker, there is an easy fix. If there is an odd # of pieces in a system that inverts phase (usually this only happens with pre's so that odd # is usually 1) then just reverse the the speaker cables at one end to return to absolute phase. Or is some cases one can use the phase reversal switch found on some gear. If the source or amp also (unusual) also inverts phase, then all will return to normal.

Thanks for the tip. I thought it wouldn't be so straight forward because my setup includes a REL subwoofer (which connects to speaker ground and right/left speaker terminals), but of course the sub has a phase reversal switch. So it should work as you described.

Unsound is unwrong. Yep, that's all you do...reverse blacks and reds at the amp (or speakers, not both). Remember, inverting phase doesn't mean out of phase (where one speaker is wired wrong and mono signals lose specific image). Theory also says that so many multitracks and so many microphones are being used in most recordings that some of them are inverted anyway.....

Can I ask why it inverts the phase in the 1st place?

Seneca it is more sonically advantageous to have a circuit that inverts phase because it is a simpler circuit requiring more attention to circuit design. On the other hand a circuit that does not invert phase has extra sound-degrading circuitry. Many quality preamps for this reason do invert phase.