filler-driver crossovers--a question

Dartagnan · 17th November 2004, 03:34 PM

Hi all,

I recently read John Kreskovsky's interesting article about transient-perfect filler driver crossovers. If I understand correctly, he's crossing the high and low with 2nd-order Linkwitz-Riley slopes IN PHASE so there's a deep cancellation. Then he's filling in the cancellation with a filler driver with a narrow passband and 1st-order slopes.

Ok, so I got wondering if there would be any merit to using my 2-way pro audio electronic XO in a similar way. I would reverse the phase of one side, which would create a null between the bass and treble, then I'd cross in a filler driver passively with a series cap and coil.

The only catch is that my electronic XO has *4th-order* L/R slopes.

So I guess my question is how would the end result of the filler driver concept be different using 4th-order slopes on the bass/treble?

Bill F. · 18th November 2004, 04:09 PM

*Bump*

I'm curious about this, too. Anyone?

Bill Fitzpatrick · 18th November 2004, 04:20 PM

As I recall, it was B&O that tried this about 30 years ago. I guess it looked good on paper but it didn't fly.

Dartagnan · 19th November 2004, 12:14 PM

It seems to me that whatever the slopes of the high and low, they will be phase coherent since they're mirror image. But specifically I'm wondering what FR probs 24dB slopes might have compared to 12db slopes. I expect there may be some ripple? Can anyone sim this?

thoriated · 19th November 2004, 04:00 PM

Mixing higher filter orders like this may give some narrowband notches and peaks that may detract from the listening experience.

I'm doing something a little similar with a 2 1/2 way system I designed using three 2226J woofers in a vertical array where the top one handles most of the signal from 300hz-700hz before crossing over to the HF unit (all quasi first order). Even though there's no significant response anomaly on the HF horn axis, the single source of the band limited information can occasionally call attention to itself a bit as you move up and down vertically due to differences in off axis radiation patterns at different frequencies.

17th November 2004, 03:34 PM	#1
Dartagnan diyAudio Member Join Date: Oct 2004	filler-driver crossovers--a question Hi all, I recently read John Kreskovsky's interesting article about transient-perfect filler driver crossovers. If I understand correctly, he's crossing the high and low with 2nd-order Linkwitz-Riley slopes IN PHASE so there's a deep cancellation. Then he's filling in the cancellation with a filler driver with a narrow passband and 1st-order slopes. Ok, so I got wondering if there would be any merit to using my 2-way pro audio electronic XO in a similar way. I would reverse the phase of one side, which would create a null between the bass and treble, then I'd cross in a filler driver passively with a series cap and coil. The only catch is that my electronic XO has 4th-order L/R slopes. So I guess my question is how would the end result of the filler driver concept be different using 4th-order slopes on the bass/treble?

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18th November 2004, 04:09 PM	#2
Bill F. diyAudio Member Join Date: Nov 2001 Location: SW MI	Bump I'm curious about this, too. Anyone?

18th November 2004, 04:20 PM	#3
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	As I recall, it was B&O that tried this about 30 years ago. I guess it looked good on paper but it didn't fly.

19th November 2004, 12:14 PM	#4
Dartagnan diyAudio Member Join Date: Oct 2004	It seems to me that whatever the slopes of the high and low, they will be phase coherent since they're mirror image. But specifically I'm wondering what FR probs 24dB slopes might have compared to 12db slopes. I expect there may be some ripple? Can anyone sim this?

19th November 2004, 04:00 PM	#5
thoriated diyAudio Member Join Date: Nov 2003 Location: flyover country	Mixing higher filter orders like this may give some narrowband notches and peaks that may detract from the listening experience. I'm doing something a little similar with a 2 1/2 way system I designed using three 2226J woofers in a vertical array where the top one handles most of the signal from 300hz-700hz before crossing over to the HF unit (all quasi first order). Even though there's no significant response anomaly on the HF horn axis, the single source of the band limited information can occasionally call attention to itself a bit as you move up and down vertically due to differences in off axis radiation patterns at different frequencies.