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Old 24th November 2012, 11:04 AM   #391
Juhazi is offline Juhazi  Finland
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Than you very much for your help, guys!

Here are a better sketches of the sub and my home theater room with a 100" screen in precise proportions. I just ordred the boards, but I'll get the drivers and amp only after Christmas. Photos will come later on and I can do nearfield and room measurements too.

Juha
Attached Images
File Type: png ppsl 518 2xDayton 15 complex.png (24.5 KB, 401 views)
File Type: png ppsl 518 2xDayton 15 complete.png (17.0 KB, 395 views)
File Type: jpg teattterihuone ppsl518.jpg (135.6 KB, 395 views)
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Old 4th December 2012, 03:51 AM   #392
OscarS is offline OscarS  United States
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Quote:
Originally Posted by weltersys View Post
A plenum, or slot, is the space between the two speakers.
The plenum does not increase efficiency like a large horn would, but does subjectively increase "punch" and "tightness", and allows for a smaller frontal area than if the speakers were front loaded, and is easier to build than a stepped baffle for push pull as is used with speakers requiring a higher crossover point.
Hmm. how about configuring a PPSL type of setup within a tapped horn? One side (the plenum side) could fire into S2, and the opposite side could be channeled into S3 (or any other S in a multi-segment TH) perhaps?
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Old 4th December 2012, 06:44 AM   #393
djk is offline djk
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Danley has several that meet the PP criteria, minus the slot.

It would be pretty straightforward to do a quad 12 PPSL with the plenum driving a central path bifurcating and coming back down both sides.
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Old 4th December 2012, 01:38 PM   #394
epa is offline epa  Netherlands
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the only "problem" with that, is the difference in s4.
soon whe are going to bild a double 15 sub ,then whe try it out.
Click the image to open in full size.
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Old 4th December 2012, 02:14 PM   #395
tb46 is offline tb46  United States
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Hi epa,

When you turn one of the drivers around you get an automatic S2 correction, but now you have to play with the other side of that driver, as you say there will be a difference in S4s (it might not be a problem).

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Old 4th December 2012, 02:33 PM   #396
tb46 is offline tb46  United States
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Default PPSL T-TQWT

Hi Y'all,

I once drew this one up for ODougbo, it's a bjorno T-TQWT that evolved from a NEO Dan single driver design. The driver was a PE 299-114 6-1/2" factory buyout.

Regards,
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File Type: pdf NEO Dan_ODougbo_T-TQWT_double_notes_2.pdf (30.5 KB, 82 views)
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Old 7th December 2012, 01:11 PM   #397
epa is offline epa  Netherlands
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hi oliver
i simed both with normal and reversed driver .
that is for s2.
i left s4 the same.
well see how it go's.
Click the image to open in full size.
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Old 7th December 2012, 01:15 PM   #398
tb46 is offline tb46  United States
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Hi epa,

It'll be interesting to see how it measures.

Regards,
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Old 7th December 2012, 08:29 PM   #399
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by epa View Post
well see how it go's.
No need to worry Erik, you'll get there . Just keep an eye on differences in movement between the drivers around 120Hz at high levels.

Last edited by Djim; 7th December 2012 at 08:41 PM.
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Old 8th December 2012, 06:14 AM   #400
epa is offline epa  Netherlands
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hi jim
it wil be crossed at 80~100hz steep.
i wil put some sort of stub in the s4 area,for the test.
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