Axiom Home Page Forums General Discussion Technical Questions EP-350 V3 warmup?

Ya know, I've never messed with that on my sub. Perhaps I should try it.

Some people like a variable phase dial. I find having a 0°/180° polarity switch covers enough ground. Having the drivers in sync is mandatory.

I agree with SirQuack...In most situations drivers facing the same direction and on the same plane, 9 times out of 10 you'll find 0° phase your best option (all drivers in the system are pushing and pulling in unison). However, there are situations (I believe my drivers are wired backwards or the amplifier in the sub inverts polarity) where even room acoustics can create problems. Trust your ears. If your ears do not hear any difference leave it at 0° and don't sweat it.

Another way to micro-adjust the phase of your sub is to play with the "subwoofer distance" in your receiver. Phase issues is the reason why often tools like Audissey does strange thing with subwoofer distance.

My statement comes from what Ian, Alan, and Chris (Audyssey), and I believe Dr Toole, say you should do in most situations. I've played around with phase until I'm blue in the face, graphs up the ying yang, etc. Phase, is only one component of how a speakers works within a room. Placement, room size/dimensions, etc. also affect FR. In all the testing I've done with 3 subs and many many placements, I always get better results using 0 phase.

I agree, as long as you actually HAVE room to move the sub. Not everyone has multiple positions available. When you don't it is nice to have subwoofer distance as fallback (no need for fancy dial on the sub itself where 0/180 is quite enough).

The problem with variable phase dials is that AFAIK nobody has ever made a "variable phase" circuit, it's a "variable delay" labelled as variable phase.

Ideally I guess you would have both; a switch to invert and introduce a 180 degree phase shift in all signals no matter the frequency, and a variable delay for fine tuning. Then again, since AV receivers frequently have the variable delay covered...

... (light slowly flickers on) I guess that's why the switch is standard these days

Woulda never gone off if you had a UPS.