[Wind Chaser]

I have an HSU mid bass module and on the back side control panel, there is a switch to set the phase at 0 or 180. With the tube amp, the bass is more robust and better defined with the phase set at 0. However, with the solid state amp, the bass is fuller and richer when positioned at 180. In either case, the difference is quite substantial. What is going on here?

[rlee8394]

Chaser,

More than likely your solid state amp is inverting, so when you set the HSU to 180 degrees, it's output is now in phase with the output of you solid state amp. 

[FullRangeMan]

I have an HSU mid bass module and on the back side control panel, there is a switch to set the phase at 0 or 180. With the tube amp, the bass is more robust and better defined with the phase set at 0. However, with the solid state amp, the bass is fuller and richer when positioned at 180. In either case, the difference is quite substantial. What is going on here?

If the recording and amp are phase correct a 0º speaker will emit positive acoustic wave to front and negative acoustic wave to back.

[Letitroll98]

Chaser,

More than likely your solid state amp is inverting, so when you set the HSU to 180 degrees, it's output is now in phase with the output of you solid state amp.

? 
Shouldn't that be reworded either one way or the other?