audibility of full 360 degrees phase shift

mazurek · 14th January 2006, 09:45 PM

Is a full 360 degrees phase shift audible?

I am making an active crossover, and it requires an allpass delay. The tweeter must be delayed 190 us according to measurements, and I could use two stages of the filters shown here http://www.linkwitzlab.com/filters.htm#4. However, if a 360 degree phase shift is inaudible, then I could instead delay the midrange by 60 us to make the waveform a full 180 degrees behind (250 us = 1/2 wavelength at crossover), and then invert the polarity to total 360 degrees shift. Putting a shorter delay circuit in the midrange would result in much less phase distortion due to the allpass delay filter.

What do you all think.

Thanks,
Lee

poobah · 14th January 2006, 09:56 PM

Do you have the option of moving your drivers to achieve delay?

mazurek · 14th January 2006, 10:03 PM

Not in a box made by parts express and without any tools, unless I tilt it 30 degrees and listen to it all off axis.

poobah · 14th January 2006, 10:09 PM

Your 360 phase shift thing will work just fine... I have used similar tricks in high-end car stereos where woofers were in the rear tweets in front etc... it works.

And good job of thinking outside the cone...

14th January 2006, 09:45 PM	#1
mazurek diyAudio Member Join Date: Aug 2005	audibility of full 360 degrees phase shift Is a full 360 degrees phase shift audible? I am making an active crossover, and it requires an allpass delay. The tweeter must be delayed 190 us according to measurements, and I could use two stages of the filters shown here http://www.linkwitzlab.com/filters.htm#4. However, if a 360 degree phase shift is inaudible, then I could instead delay the midrange by 60 us to make the waveform a full 180 degrees behind (250 us = 1/2 wavelength at crossover), and then invert the polarity to total 360 degrees shift. Putting a shorter delay circuit in the midrange would result in much less phase distortion due to the allpass delay filter. What do you all think. Thanks, Lee

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14th January 2006, 09:56 PM	#2
poobah diyAudio Member Join Date: Nov 2005	Do you have the option of moving your drivers to achieve delay?

14th January 2006, 10:03 PM	#3
mazurek diyAudio Member Join Date: Aug 2005	Not in a box made by parts express and without any tools, unless I tilt it 30 degrees and listen to it all off axis.

14th January 2006, 10:09 PM	#4
poobah diyAudio Member Join Date: Nov 2005	Your 360 phase shift thing will work just fine... I have used similar tricks in high-end car stereos where woofers were in the rear tweets in front etc... it works. And good job of thinking outside the cone...