CSS 3 way bookshelf speakers - Page 4

sam xt · 24th February 2010, 08:38 PM

Thanks for the reminder Dave.

The final crossover I'm using is as follows.

For the tweeter I went second order at 7200Hz. I used a 2.41 uF cap and a 0.20 mH inductor in the arrangement shown in the first schematic. (The attenuation resistors are also in there)

For the Mids low pass I used a second order low pass with a 0.27 mH inductor and a 1.84 uF cap. The high pass for the mid is a first order with a cap of 68 uF.

For the woofer I used a first order low pass with a 3.76 mH inductor.

So far I really like the way it sounds. The project I'm working on now it to bi amp them so that I can put more power to the SDX7 as they do sound a little strong on the high end.

Let me know if you have any other questions and I'll try to answer them a little faster.

planet10 · 24th February 2010, 08:47 PM

Thanx Sam. Did you ever mod the SDX7s?

dave

planet10 · 25th February 2010, 12:24 AM

Sam,

Can you vet this XO map. I guessed at the driver polarities, You also didn't mention a zobel on the SDX7 that was on the XO early in the thread.

dave

sam xt · 9th March 2010, 01:36 AM

Dave,

I never did do the cone treatment. I might have a try at it in the future but right now I'm working on another project that's taking up my time.

The XO you posted seems to be correct. I never put a zobel on the SDX7.

If there is any other information you were wondering about let me know.

Sam

planet10 · 10th March 2010, 12:43 AM

Do report back when you've done the SDX7.

I just wanted to make sure i had the XO right.

dave

GringoAudio · 06:28 AM

I did a similar setup tonight with a discontinued Tangband tweeter (part number not known at this point). Only first order on the midrange Low Pass though. Why did you go 2nd Order Sam? My setup sounds nice. Just two boxes piled up with tweeter sitting on top so far. 10 litre sealed for SDX7, 5.5 litre aperiodic for FR125. I tried ported on SDX7 but the bass was flabby. A better less sibilant tweeter is now something I need. Ideas?
BTW, the pictures of SAMXT's boxes on this thread do not show up anymore....

GringoAudio · 31st October 2011, 12:59 PM

My tweeter was crossed in at 4KHz first order ...so same drivers...slightly different x-over....values all approx. the same. 4mH coil on SDX7. 53uF and .28mH on FR125. I will have to try a 2nd order x-over some day. Sweet spot is bigger right?

GringoAudio · 24th January 2012, 09:45 PM

I padded down the FR125 on my version of this. Too shouty. Different tweeter. AND YES this SDX7 driver needs a sealed box!!

24th February 2010, 08:47 PM	#32
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Thanx Sam. Did you ever mod the SDX7s? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

10th March 2010, 12:43 AM	#35
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Do report back when you've done the SDX7. I just wanted to make sure i had the XO right. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

31st October 2011, 06:27 AM	#36
GringoAudio diyAudio Member Join Date: Oct 2007	I did a similar setup tonight with a discontinued Tangband tweeter (part number not known at this point). Only first order on the midrange Low Pass though. Why did you go 2nd Order Sam? My setup sounds nice. Just two boxes piled up with tweeter sitting on top so far. 10 litre sealed for SDX7, 5.5 litre aperiodic for FR125. I tried ported on SDX7 but the bass was flabby. A better less sibilant tweeter is now something I need. Ideas? BTW, the pictures of SAMXT's boxes on this thread do not show up anymore.... Last edited by GringoAudio; 31st October 2011 at 06:28 AM. Reason: forgot a word

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24th February 2010, 08:38 PM	#31
sam xt diyAudio Member Join Date: Jun 2008	Thanks for the reminder Dave. The final crossover I'm using is as follows. For the tweeter I went second order at 7200Hz. I used a 2.41 uF cap and a 0.20 mH inductor in the arrangement shown in the first schematic. (The attenuation resistors are also in there) For the Mids low pass I used a second order low pass with a 0.27 mH inductor and a 1.84 uF cap. The high pass for the mid is a first order with a cap of 68 uF. For the woofer I used a first order low pass with a 3.76 mH inductor. So far I really like the way it sounds. The project I'm working on now it to bi amp them so that I can put more power to the SDX7 as they do sound a little strong on the high end. Let me know if you have any other questions and I'll try to answer them a little faster.

9th March 2010, 01:36 AM	#34
sam xt diyAudio Member Join Date: Jun 2008	Dave, I never did do the cone treatment. I might have a try at it in the future but right now I'm working on another project that's taking up my time. The XO you posted seems to be correct. I never put a zobel on the SDX7. If there is any other information you were wondering about let me know. Sam

31st October 2011, 12:59 PM	#37
GringoAudio diyAudio Member Join Date: Oct 2007	My tweeter was crossed in at 4KHz first order ...so same drivers...slightly different x-over....values all approx. the same. 4mH coil on SDX7. 53uF and .28mH on FR125. I will have to try a 2nd order x-over some day. Sweet spot is bigger right?

24th January 2012, 09:45 PM	#38
GringoAudio diyAudio Member Join Date: Oct 2007	I padded down the FR125 on my version of this. Too shouty. Different tweeter. AND YES this SDX7 driver needs a sealed box!!

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