Wanted: a free lunch crossover for a full range

dpaws · 21st December 2008, 06:59 PM

Evening all....

Whilst most here enjoy the extended range of a single driver, there are many that suppliment either end (sometimes both) with an additional driver to suit their musical tastes.

I'm interested in a free lunch crossover for a potential two way project, a D9nf on top and a ten inch driver to suppliment the bass. I wish to avoid the timing/phase shifts associated with a conventional crossover. Is it feasable to crossover completely accoustically (I'm guessing around 100Hz) and of so, what's the cost accoustically ie what do I compromise in doing so?

Thinking aloud from an ignorant perspective : For high pass I understand that the baffle width of an open baffle reaches a cancellation frequency and for low pass maybe a 4th order bandpass "sub"?

Nelson Pass · 22nd December 2008, 02:10 AM

You will not be enjoying freedom from "timing/phase shifts" with
that approach, but that doesn't mean that it might not sound good.

dpaws · 22nd December 2008, 02:30 AM

Thanks for the gentle warning Nelson

(and thank you too for your new Fs plots on the d9's)...

Cal Weldon · 22nd December 2008, 05:36 PM

Consider bi-amping with a plate amp for the bass driver.

dpaws · 22nd December 2008, 07:28 PM

Thanks Cal, but I've a pair of Graaf GM20 OTL's availible so 4 x 20W's on tap... I'd much prefer to run each driver directly if it's possible.

I can eventually high/low pass passively at line level (I've an active Pass XVR1 to experiment with first) as I've suplus gain after my DAC but I was wondering if I could do it without any extra components ie accoustically.....

My other option I suppose is to mono the amps giving 70wpc and use a passive series xover but I'd much prefer the former, it seems a more efficient design

Nelson Pass · 22nd December 2008, 09:52 PM

Something I have seen work well is the Velodyne V10 product (occasionally
on sale at Fry's for $149) sitting below the FR in a baffle or even a box.

The frequency, level and phase controls are functional and I have used it
without any crossover on the FR. The result greatly exceeds expectation.

21st December 2008, 06:59 PM	#1
dpaws diyAudio Member Join Date: Jan 2005 Location: Essex, UK	Wanted: a free lunch crossover for a full range Evening all.... Whilst most here enjoy the extended range of a single driver, there are many that suppliment either end (sometimes both) with an additional driver to suit their musical tastes. I'm interested in a free lunch crossover for a potential two way project, a D9nf on top and a ten inch driver to suppliment the bass. I wish to avoid the timing/phase shifts associated with a conventional crossover. Is it feasable to crossover completely accoustically (I'm guessing around 100Hz) and of so, what's the cost accoustically ie what do I compromise in doing so? Thinking aloud from an ignorant perspective : For high pass I understand that the baffle width of an open baffle reaches a cancellation frequency and for low pass maybe a 4th order bandpass "sub"?

22nd December 2008, 05:36 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Consider bi-amping with a plate amp for the bass driver. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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22nd December 2008, 02:10 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	You will not be enjoying freedom from "timing/phase shifts" with that approach, but that doesn't mean that it might not sound good.

22nd December 2008, 02:30 AM	#3
dpaws diyAudio Member Join Date: Jan 2005 Location: Essex, UK	Thanks for the gentle warning Nelson (and thank you too for your new Fs plots on the d9's)...

22nd December 2008, 07:28 PM	#5
dpaws diyAudio Member Join Date: Jan 2005 Location: Essex, UK	Thanks Cal, but I've a pair of Graaf GM20 OTL's availible so 4 x 20W's on tap... I'd much prefer to run each driver directly if it's possible. I can eventually high/low pass passively at line level (I've an active Pass XVR1 to experiment with first) as I've suplus gain after my DAC but I was wondering if I could do it without any extra components ie accoustically..... My other option I suppose is to mono the amps giving 70wpc and use a passive series xover but I'd much prefer the former, it seems a more efficient design

22nd December 2008, 09:52 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Something I have seen work well is the Velodyne V10 product (occasionally on sale at Fry's for $149) sitting below the FR in a baffle or even a box. The frequency, level and phase controls are functional and I have used it without any crossover on the FR. The result greatly exceeds expectation.

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