OK, I'm a scratching my head now. Here's what I got. I'm using the Chesky Ultimate DVD-A/DVD-V test disc. Has really easy to use phase tests. Plays info in phase, then out of phase, and obviously the in phase stuff should be louder, so I have SPL measurements too. All speakers small in the 950, sub on. All speakers large in the 47ai, sub on. 80 Hz crossover switch "on" on the back of the 950. All distances are set correctly everywhere. (BTW, I did exactly measure all the distances, and for example, the 1 ft difference between the mains and sub grew to 2 ft, but unfortunately, doesn't change the results). One change I did make, I changed the sub distance in the 47ai to equal the mains difference. The reason being is that the distance between those 2 is *already* taken into account by how I have the phase knob set on the sub. OK...

DVD-V (digital connection): in phase 82 dB, out of phase 74 (pos sub input)
DVD-V (digital connection): in phase 70 dB, out of phase 78 (neg sub input)

Looks good so far, right?

DVD-A (analog connection): in phase 71, out of phase 79 (pos sub input)

So at this point you would say, bravo, the sub output using the 6 ch input *is* out of phase vs a digital input. But...

DVD-A (analog connection): in phase 66, out of phase 82 (neg sub input)

It becomes *more* out of phase even when I switch the polarity input on the sub!

So I got to thinking, something must be overriding it.

So I changed all the distances in the player to be equal. That way, no *other* channels phase could mess with the fronts. (In other words, you want to do crossing over, *then* delay/time alignment. If I have the actual distances set in the player, it's doing time alginment 1st, then the 950 is doing the analog crossing over last. So it's adding up all kinds of messed up phase info into the sub.)

But the results didn't change much from the previous numbers. The frustrating part? With the Chesky disc and its phase tests, I simply cannot get the 6 ch bypass input into phase. Not with the pos or neg polarity input on the sub, or any change to the variable phase knob, or by changing distances in the player.

Here's a different way, discrete test tone CD, so I know I am only getting 2.0 sound that is then crossed over (80 Hz test tone):

CD (digital connection): in phase 80 dB (pos sub input)
CD (digital connection): out of phase 74 dB (neg sub input)

CD (analog 6 ch connection): in phase 68 dB (pos sub input)
CD (analog 6 ch connection): out of phase 75 dB (neg sub input)

This is the very 1st test I did, and *that's* where I draw the conclusion that the analog and digital crossovers put the sub output out of phase from each other.

Also, the volume levels are consistent within each test, but because the analog and digital connections give different volumes, I adjust them slightly just to give more readable measurements. (I probably shouldn't have done that, then you'd see those differences too.)

So, I am still convinced that the 950 has a phase difference between the sub output using the analog crossover vs the digital. Just that now I am a little bit more confused in terms of how the tests for phase on the Chesky disc are generated...

??



[This message has been edited by Kevin C Brown (edited March 23, 2003).]