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Old 21st December 2012, 08:21 AM   #41
Juhazi is offline Juhazi  Finland
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Dayton DCS380-4 Dayton Audio DCS380-4 15" Classic Subwoofer 4 Ohm 295-470 Connected in series to make 8R and push-pull.

The inner dimensions of final boxes are 38x62x100 cm (235L) Q=0,7 I'll put some polystester wool inside to kill standing waves I'll connect the two mirror-imaged closed volumes wit a piece of ¤45mm PVC pipe. The boxes are not fixed to each other yet so I can change the width of the slot and the filling of plenums bottom.

Norman, how is your PPSL working?

I have ordered the drivers, I'll get them in early January. Intertechnik had them in stock and cargo is only 15€ (I love EU)
https://www.intertechnik.de/Shop/Lau...de,7053,138674
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Last edited by Juhazi; 21st December 2012 at 08:47 AM.
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Old 21st December 2012, 08:55 PM   #42
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no ppsl, but.....................

maybe a jbl 11mm vertec in a 30hz TH with boost @ 30hz and subsonic below that........


Norman
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Old 22nd December 2012, 04:17 AM   #43
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For the 380-4 dayton

sealed Qtc .707
Vb= 8.3ft3 (235 litres)
F3 = Fsb = 32.4hz

8mm xmax, 89db 1w/1m

Big box, but seems to be an excellent sealed subwoofer for the money.

The rss390hf is almost twice as expensive for 14mm, but 5.5ft3 box. 2hz less F3 shouldn't be audible. I'd go for 2 of the 380s (especially push pull) over the 390 any day of the week given you can afford the space. I guarantee 2 of those will sound much better than a single 390hf.

I look forward to your results.
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Old 7th January 2013, 02:18 PM   #44
Juhazi is offline Juhazi  Finland
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The folks at Intertechnik informed me that they actually don't have the drivers on stock. Some 6-7 weeks to wait...
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Old 11th January 2013, 12:55 AM   #45
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How about sealed PPSL with Linkwitz transform? I know you need more power and decent woofers that can handle a bit of power, and have excellent excursion capabilities. But a much smaller enclosure is the benefit. I have heard a lot of good things with PPSL, but not sure I recall anyone making one WITH LWT. I want to make one. I even have some woofers laying around I could use. I just don't have the money to buy a minidsp right now :P
Someone do it!
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Old 12th January 2013, 03:52 AM   #46
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I don't think linkwitz transform as good an option anymore since i saw an article where a single peerless with passive radiator (in ideal 4th order) was said to sound better than 4 in a linkwitz transform.

I think excursion is the key.


I'd been leaning towards 2 epic 12's (23mm xmax) in qtc .707 ppsl, vb=3ft3 F3=fsb=45, then linkwitz transform 12db so boosted F3 now around 22hz........ but 2 of them could be placed in a ported 6ft3 box with f3=tuning=25hz, and i bet would sound better. 12db boost is a bunch of excursion (more cone excursion = more harmonic distortion), while the ported would be moving less under 40hz and not much at all at 25hz if i can get big enough ports !!!!

The rss390hf needed 200 watts to skip past xmax with its sealed 5.5ft3 qtc .707 and F3=31hz. It looks to be one of the best sealed options currently availiable.

norman

Last edited by norman bates; 12th January 2013 at 03:55 AM.
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Old 14th January 2013, 05:41 PM   #47
Juhazi is offline Juhazi  Finland
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The easy way to boost a closed cabinet sub is to use a Hypex plate amp - I use DS2.0 These have an adjustalble gain up to 6db, lowest 20Hz. The amp has fixed highpass@12Hz. This means that instead of -10dB at 20Hz I'll have -4dB@20Hz. That might be too much asked for the Classic Dayton, but a RSS390 would do that easily
Click the image to open in full size.
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Old 15th January 2013, 08:19 PM   #48
Juhazi is offline Juhazi  Finland
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Finally I got some Hornresp graphs. I hope they are sane. Rear chamber effects not masked - I need to put polyester wool inside! Do not pay attention to spl value, it might not be 1W
Attached Images
File Type: png hornresp ppsl470 parameters.png (54.2 KB, 148 views)
File Type: png hornresp ppsl470 spl.png (62.9 KB, 148 views)
File Type: png hornresp ppsl470 phase.png (85.1 KB, 145 views)
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AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient

Last edited by Juhazi; 15th January 2013 at 08:34 PM.
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Old 16th January 2013, 01:33 PM   #49
Juhazi is offline Juhazi  Finland
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Some overnight sensations... I put in parameters now a little differently, following instructions in this thread Hornresp for Dum... hmm... Everyone - Home Theater Forum and Systems - HomeTheaterShack.com

Some changes, I show comparasion of ppsl slot loading effect vs. standarnd sealed, ppsl is thick line. Both simulations with rear chamber reflections causing the trouble at 180Hz (no problem really because of high-pass at 80Hz

There is 2dB slot loading gain at 15-38Hz, wow. But the spl curve is more even than conventional sealed.

My configuration is not fixed, I can easily turn the boxes around and voilá I get 2 separate 15" sealed subs.
Attached Images
File Type: png hornresp ppsl470 parameters.png (54.2 KB, 131 views)
File Type: png hornresp ppsl470 spl compare.png (74.8 KB, 28 views)
File Type: png hornresp ppsl470 phase compare.png (66.4 KB, 25 views)
File Type: png hornresp ppsl470 gd compare.png (72.3 KB, 14 views)
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AES Associate Member / My DIY speaker history: -74 Philips 3-way, -82 Hifi 85B, -07 Zaph L18, XLS10+PR/Hypex, -08 CSS125FR, -08 Hifitalo AW-7, -08 TangBand FR, -09 MarkK ER18DXT, -13 PPSL470, -13 AINOgradient

Last edited by Juhazi; 16th January 2013 at 01:44 PM.
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Old 16th January 2013, 08:57 PM   #50
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I was never bothered by resonances when crossing 80hz@18db or 100hz@24db with a slot large enough for dual 12's or dual 18's.

What's causing the 200hz hump ?
rear chamber reflections you say ?
I assume it is the 3' long box behind the drivers.........

Norman
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