DCX2496 XO advice for a noob.

Docks · 09:56 PM

I'm looking to build a pretty high end speaker. Each woofer will be in its own cabinet and will also use a sealed LMS5400 subwoofer with a Q of 0.6.
I want to use a first order crossover with my dcx2496
I would really like to use the ScanSpeak d3004-66200 as it has a very flat response and lower THD. I've also read good things about the illuminator woofers.
The LMS 5400 is flat to around 200hz and the 66200 is flat to around 1kish. Will I end up having to use 2 different size woofers on top of the tweeter and sub to make this a usable 1st order speaker? OR is this possible to do with 1 mid woofer. I really dont want to push the tweeter too low.
Do active crossovers still produce the phase and time shift that passive ones do when using 2nd or 3rd order?

Please suggest a woofer (or 2 if needed) and where i should be crossing it over. I really would prefer a scanspeak illuminator though.

Thanks.

Pano · 24th August 2011, 10:28 PM

Active filters produce the same phase shifts as (ideal) passive crossovers. It's not something to worry too much about.

Charles Darwin · 25th August 2011, 08:50 AM

Don't know about this particular xover but digital ones can be linear phase ie no phase shift at all.

Docks · 25th August 2011, 09:31 PM

Does anyone know if the DCX2496 has a linear phase response?

terry j · 25th August 2011, 09:51 PM

no, the usual LR etc. Actually, don't know what they are, but not linear phase

Pano · 25th August 2011, 09:52 PM

The DCX has exactly the phase shift that a textbook filter has. Whatever order or slope. As if it were made with perfect analog parts.

It does not correct phase over frequency, the way some sophisticated software filters can.

24th August 2011, 09:43 PM	#1
Docks diyAudio Member Join Date: Dec 2010	DCX2496 XO advice for a noob. I'm looking to build a pretty high end speaker. Each woofer will be in its own cabinet and will also use a sealed LMS5400 subwoofer with a Q of 0.6. I want to use a first order crossover with my dcx2496 I would really like to use the ScanSpeak d3004-66200 as it has a very flat response and lower THD. I've also read good things about the illuminator woofers. The LMS 5400 is flat to around 200hz and the 66200 is flat to around 1kish. Will I end up having to use 2 different size woofers on top of the tweeter and sub to make this a usable 1st order speaker? OR is this possible to do with 1 mid woofer. I really dont want to push the tweeter too low. Do active crossovers still produce the phase and time shift that passive ones do when using 2nd or 3rd order? Please suggest a woofer (or 2 if needed) and where i should be crossing it over. I really would prefer a scanspeak illuminator though. Thanks. Last edited by Docks; 24th August 2011 at 09:56 PM.

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24th August 2011, 10:28 PM	#2
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Active filters produce the same phase shifts as (ideal) passive crossovers. It's not something to worry too much about.

25th August 2011, 08:50 AM	#3
Charles Darwin diyAudio Member Join Date: Nov 2009 Location: Birmingham, UK	Don't know about this particular xover but digital ones can be linear phase ie no phase shift at all.

25th August 2011, 09:31 PM	#4
Docks diyAudio Member Join Date: Dec 2010	Does anyone know if the DCX2496 has a linear phase response?

25th August 2011, 09:51 PM	#5
terry j diyAudio Member Join Date: Aug 2006	no, the usual LR etc. Actually, don't know what they are, but not linear phase

25th August 2011, 09:52 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	The DCX has exactly the phase shift that a textbook filter has. Whatever order or slope. As if it were made with perfect analog parts. It does not correct phase over frequency, the way some sophisticated software filters can.