XTA DP448 Phase Filter - Can You Explain what/how/why it works?

deaf cat

Hi,

I have got interested in the phase of the woofer and tweeter, since I switched to active speakers and vocals went way way back in the sound stage.  It was suggested I switched the   & - on the tweeters, 180deg phase shift, to see if that made any difference.  To my surprise, vocals were now emanating from between the speakers, a much better place to have them

So I understand the XTA box can phase shift in steps of 2deg, this interests me because at the moment I only have a 0 and 180deg options (swapping speaker cables over) I am wondering if by playing with the phase shift in much smaller steps, I may be able to bring the vocals just slightly in front of the speakers - now that would be Fab!

It looks like, in having a quick play with the audiocore software, the phase filter can be activated at a particular frequency, or a number of different frequencies...  Am I understanding this right?

I was thinking punch in a figure of 170deg and as if by magic 170deg would then be the phase shift, rather than 180, but no it looks more complicated than that, hence this post... help... ;o)

Thanks for reading, any pointers or thoughts appreciated,
DC

Cliff

Generally speaking, if the speakers are in phase you can identify a point source in the centre. 180 degrees (one reversed), the point source disappears and the sound appears 'spacious' even extending beyond the speakers.

Now,  if you have say the left speaker a few degrees trailing the right, you will hear that the sound has moved to the right. A phase shift actually moves the sound. The ear can pin point it in a much more defined way than, say amplitude with a simple pan pot.

To change the way the sound appears (and you still want it in the middle) will require some more complex DSP.

deaf cat

Interesting, thanks for that.

Things have got spacious now I have tried 72dB crossover slopes, not sure how to correct the phase shifts due to the steep slopes yet though :-0

all good fun