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Stereophile test CD2 In/Out of Phase test:question

Hi
I just noticed that on Stereophile Test CD2,on the second track that shows in-phase and out of phase recording ,if you switch speaker wires on the amp end you will still get the test play thru your speakers as if you had a non-inverted phase.The test sounds identical not depending if you changed phase of your system or not.Please,explain why this is happening?
overhang
eldartford
4,262 posts
 
Tbg... JBL LF drivers are also phased backwards from the rest of the world. I actually experienced this when wiring up some 15" JBL subwoofers together with some 12" subwoofer drivers of a different brand, and thought that I had screwed up the wiring at the driver inside the enclosure. They went opposite ways. Subsequently I read about it.
sean
6,231 posts
 
El: While i'm sure that you know this, all woofers should displace air in the same direction for best results, regardless of how the manufacturer has them labeled. I assume that you corrected this? Sean
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tbg
5,263 posts
 
Sean, I would think it would be all woofers facing the same direction should pulse together.

It is curious why JBL would mismark the woofers. Maybe in the original design for which they were used the mid-range and treble were deliberately out of phase with the woofers.
eldartford
4,262 posts
 
Tbg..."Mismark"? JBL probably thinks they are right and the world is wrong. And this is ALL JBL drivers not just the ones I use (according to what I read). It is purely arbitrary anyway, and as Sean says you just connect wires accordingly.
tbg
5,263 posts
 
It is also arbitrary which side of the road on which we drive, but it helps that there is a convention. In my experience, it often is very important to have correct absolute phase. I only wish I had an easier way to switch phase.
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