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Multi-Way Conventional loudspeakers with crossovers

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Old 25th October 2013, 10:46 PM   #51
ODougbo is offline ODougbo  United States
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Now's there's a large cap on the tweeter; a MS design uses a 9.uF in a 4" mtm (Vifa XT25).
Strange that cap is 2.5 x larger in the d'Appolito design 8.2uF vs. 3.3uF in the 2-way.

There is a replacement woofer for the Troels Grovsen designs - I'll have to look for old email with details.
Edit - sorry no, it was a different project:http://www.troelsgravesen.dk/Peerless_HDS830875.htm

Last edited by ODougbo; 25th October 2013 at 11:06 PM.
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Old 27th October 2013, 10:09 AM   #52
ODougbo is offline ODougbo  United States
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Need one more of these, # 5
Getting faster, but still several hours of work, which is fine AND its going to warm up later for painting

I want to keep xo costs down; diy 18g solder spool coil e.g.
Q. If I use the 4.7cap, I'm guessing I can replace the 15uF with a 10uf?

Also, since we are experimenting with these, can the xo be brought down a bit?
I could just replace the 4.7cap; willy-nilly with slightly larger ones but worried about phase.
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Old 27th October 2013, 10:39 AM   #53
Dissi is offline Dissi  Switzerland
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18 awg woofer coil and 4.7/10 uF on the tweeter? Still good, try it.
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Old 27th October 2013, 11:47 AM   #54
Dissi is offline Dissi  Switzerland
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A minimum crossover saves two coils.

Note: 10 uF instead of 15 uF is a bad idea here and the frequency response is as good as it gets...
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File Type: jpg SimulationODougboPeerlessMTM3.jpg (116.6 KB, 56 views)
File Type: jpg CrossoverODougboPeerlessMTM3.jpg (59.1 KB, 56 views)

Last edited by Dissi; 27th October 2013 at 12:12 PM.
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Old 27th October 2013, 11:50 AM   #55
ODougbo is offline ODougbo  United States
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Well that's interesting and in the nick of time....
Thanks Dissi!!
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Old 27th October 2013, 04:03 PM   #56
ODougbo is offline ODougbo  United States
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Could be trouble....they may work better!
Hard to say really, but these are a bit brighter......
I like them

Made up pair - 16uf tweeter caps, btw.
Nope we didn't save much
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Last edited by ODougbo; 27th October 2013 at 04:05 PM.
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Old 27th October 2013, 04:14 PM   #57
Dissi is offline Dissi  Switzerland
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You never know. Anything from "much worse" to "even better" is possible. I'm only guessing, you decide.
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Old 28th October 2013, 09:17 AM   #58
ODougbo is offline ODougbo  United States
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The box in pic above is the set that had the tweeter break-up. This is gone now, so that's an eye opener

Maybe some of the x25's work better than others, which was the case with MDT 28-30's; some had "the noise" others were crystal clear.

This xo version is well balanced, maybe gave up some bass, but hard to say - still plenty. The middle is shinning through; very pleasant and sound wayyyyy better than ever expected.
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Old 1st November 2013, 02:36 PM   #59
ODougbo is offline ODougbo  United States
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Default Little rumble boxes

These are a blast! And learned a few things along the way.
e.g. the jumbo woofer coils didn't do much, the smaller ones worked fine.

Dissi, make sure you are sitting down - Raised the tweeter level this time; 3.3ohm. Really like what you did with the tweeters, very natural

The black one on the floor won't be here long, that's going to friends for a swap
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Old 6th December 2013, 05:29 AM   #60
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Default Peerless 832591

Hi ODougbo,

I have just tried to PM regarding the two projects you completed using the Peerless 832591. I have four brand new one sitting in my garage along with two Peerless 811827 that I was going to use in an MTM configuration. I've also read through your other posts where you used the 832591 with the XT25 in a smaller bookshelf design.
I would like to contact you if that's ok just regarding some questions I had.

Cheers
Caz
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