Help getting 15W/8530K00 and SB29RDC togeter

nelsonvandal · 6th April 2010, 03:23 PM

I'm a speaker newb, but I want to do a small tower as good as possible yet as cheap as possible. I've been looking at Zaph ZD5, but after some reading I understand that there are better tweeters than XT25, and I'd probably do allright with a simpler filter. The strongest tweeter candidates seem to be SB Acoustics SB29RDC, Dayton RS28 and Peerless HDS. From what I've read I'd probably like SB29RDC the most.

Does anyone have a filter? Could anyone run sims?

Is it sane to run a sim from eg Ellam or ZD5, just the tweeter, and try to get exactly the same frequency response from SB29RDC? I've tried this with LspCAD and frd/zma-files extracted from graphs at Zaph's site.

hihopes · 6th April 2010, 08:34 PM

Suggestions:-

1) download a free x-over simulator. I use one called x-oversim by Isaac MCN. I think it is a Beta version but it works fine.

2) Choose a crossover point that could work well with your drivers. Looking at the response graph of the SS driver I would cross over at 2000 hz due to the rise in output from there onwards and the cone breakup zone. Having tried 1st order crossover with 18w4531 recently (very similar response graph) I would suggest 2nd order. 1st order is OKish, but you will probably be able to hear some slight distortion from the cone-breakup. A 2nd order Butterworth response requires a .9mH inductor and 7uF capacitance. Other values give different damping. You can use your simulator to examine those.

3) The SB tweeter is very nice and it can come down really low if needed. You can use a 1st order on it, but otherwise 2nd order is probably safer.

4) be sure to use a Zobel network to equalize your woofer's impedance rise.

5) You will need to use an L-pad to bring the tweeter down to the same level of output as the woofer. The rated diffference is 8dB - which, by the way is huge!.

6) Have you looked at using the 18w4531 instead? It is a much closer match with the SB tweeter. They are both 4ohm drivers, for a start and the sensitivity difference is only 3dB instead of 8db with the 15w8530. I can attest to the fact that these two drivers work very well together, having just built (actually still finishing off) a pair of speakers using them. The quality of sound of these units (especially the SS) was beyond my expectations.
Hope this helps and good luck with your speakers.
regards,
William.

6th April 2010, 03:23 PM	#1
nelsonvandal diyAudio Member Join Date: Nov 2006	Help getting 15W/8530K00 and SB29RDC togeter I'm a speaker newb, but I want to do a small tower as good as possible yet as cheap as possible. I've been looking at Zaph ZD5, but after some reading I understand that there are better tweeters than XT25, and I'd probably do allright with a simpler filter. The strongest tweeter candidates seem to be SB Acoustics SB29RDC, Dayton RS28 and Peerless HDS. From what I've read I'd probably like SB29RDC the most. Does anyone have a filter? Could anyone run sims? Is it sane to run a sim from eg Ellam or ZD5, just the tweeter, and try to get exactly the same frequency response from SB29RDC? I've tried this with LspCAD and frd/zma-files extracted from graphs at Zaph's site.

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6th April 2010, 08:34 PM	#2
hihopes diyAudio Member Join Date: Sep 2004 Location: Cape Town	Suggestions:- 1) download a free x-over simulator. I use one called x-oversim by Isaac MCN. I think it is a Beta version but it works fine. 2) Choose a crossover point that could work well with your drivers. Looking at the response graph of the SS driver I would cross over at 2000 hz due to the rise in output from there onwards and the cone breakup zone. Having tried 1st order crossover with 18w4531 recently (very similar response graph) I would suggest 2nd order. 1st order is OKish, but you will probably be able to hear some slight distortion from the cone-breakup. A 2nd order Butterworth response requires a .9mH inductor and 7uF capacitance. Other values give different damping. You can use your simulator to examine those. 3) The SB tweeter is very nice and it can come down really low if needed. You can use a 1st order on it, but otherwise 2nd order is probably safer. 4) be sure to use a Zobel network to equalize your woofer's impedance rise. 5) You will need to use an L-pad to bring the tweeter down to the same level of output as the woofer. The rated diffference is 8dB - which, by the way is huge!. 6) Have you looked at using the 18w4531 instead? It is a much closer match with the SB tweeter. They are both 4ohm drivers, for a start and the sensitivity difference is only 3dB instead of 8db with the 15w8530. I can attest to the fact that these two drivers work very well together, having just built (actually still finishing off) a pair of speakers using them. The quality of sound of these units (especially the SS) was beyond my expectations. Hope this helps and good luck with your speakers. regards, William.

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