A Thread for those interested in PPSL enclosures - Page 40

Juhazi · 24th November 2012, 11:04 AM

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

OscarS · 4th December 2012, 03:51 AM

Quote:

Originally Posted by weltersys

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?

djk · 4th December 2012, 06:44 AM

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.

epa · 4th December 2012, 01:38 PM

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.

tb46 · 4th December 2012, 02:14 PM

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).

Regards,

tb46 · 4th December 2012, 02:33 PM

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,

epa · 7th December 2012, 01:11 PM

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.

tb46 · 7th December 2012, 01:15 PM

Hi epa,

It'll be interesting to see how it measures.

Regards,

Djim · 08:41 PM

Quote:

Originally Posted by epa

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.

epa · 8th December 2012, 06:14 AM

hi jim
it wil be crossed at 80~100hz steep.
i wil put some sort of stub in the s4 area,for the test.

4th December 2012, 06:44 AM	#393
djk diyAudio Member Join Date: Feb 2001 Location: USA	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. __________________ Candidates for the Darwin Award should not read this author.

4th December 2012, 01:38 PM	#394
epa diyAudio Member Join Date: Apr 2010 Location: amsterdam	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. __________________ one good thing about music ,when it hit you feel no pain. so hit me with music.

4th December 2012, 02:14 PM	#395
tb46 diyAudio Member Join Date: Jan 2006 Location: Texas	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). Regards, __________________ Oliver

7th December 2012, 01:11 PM	#397
epa diyAudio Member Join Date: Apr 2010 Location: amsterdam	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. __________________ one good thing about music ,when it hit you feel no pain. so hit me with music.

7th December 2012, 01:15 PM	#398
tb46 diyAudio Member Join Date: Jan 2006 Location: Texas	Hi epa, It'll be interesting to see how it measures. Regards, __________________ Oliver


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8th December 2012, 06:14 AM	#400
epa diyAudio Member Join Date: Apr 2010 Location: amsterdam	hi jim it wil be crossed at 80~100hz steep. i wil put some sort of stub in the s4 area,for the test. __________________ one good thing about music ,when it hit you feel no pain. so hit me with music.

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