linkwitz riley crossover - Page 2

myhrrhleine · 29th September 2012, 04:59 PM

Something to keep in mind.
Reversing the polarity of one driver does effect the sound.
While the phase will be correct at the cross over point, the phase will be 180 degrees off at all the other frequencies.
Some people are more sensitive to this than others.

rcw666 · 29th September 2012, 09:11 PM

The whole thing is complicated by acoustic offset.
The exact L-R characteristic assumes that the acoustic centers are aligned. If the driver roll off is at least an octave either side of the crossover then the driver characteristics have a minimal effect upon the result, but in may cases for instance you can get close to a quadrature phase shift due to acoustic offset.
If this happens either in or out of phase connection gives the same amplitude although group delay is different.
rcw

Dissi · 29th September 2012, 10:46 PM

In an average 2-way speaker the signal of the tweeter arrives about 0.1 ms before the woofer signal. If you want to insert an electronic delay, that makes only sense in the tweeter path. The delay changes the phase at the crossover frequency and you will not necessarily have to invert one path. A delay of half a wave length has the same effect.

29th September 2012, 04:59 PM	#11
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	Something to keep in mind. Reversing the polarity of one driver does effect the sound. While the phase will be correct at the cross over point, the phase will be 180 degrees off at all the other frequencies. Some people are more sensitive to this than others. __________________ Just because you can't hear it doesn't mean no one can.

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29th September 2012, 09:11 PM	#12
rcw666 diyAudio Member Join Date: Aug 2012	The whole thing is complicated by acoustic offset. The exact L-R characteristic assumes that the acoustic centers are aligned. If the driver roll off is at least an octave either side of the crossover then the driver characteristics have a minimal effect upon the result, but in may cases for instance you can get close to a quadrature phase shift due to acoustic offset. If this happens either in or out of phase connection gives the same amplitude although group delay is different. rcw

29th September 2012, 10:46 PM	#13
Dissi diyAudio Member Join Date: Sep 2012	In an average 2-way speaker the signal of the tweeter arrives about 0.1 ms before the woofer signal. If you want to insert an electronic delay, that makes only sense in the tweeter path. The delay changes the phase at the crossover frequency and you will not necessarily have to invert one path. A delay of half a wave length has the same effect.