A Thread for those interested in PPSL enclosures - Page 52 - diyAudio
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Old 16th October 2013, 07:44 PM   #511
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pics ? pics ?
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Old 17th October 2013, 02:35 PM   #512
MemX is offline MemX  United States
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Quote:
Originally Posted by Scott L View Post
It would be nice to see someone else (besides the regulars) actually build one and share the results.
I just built a pair based on my own "inside-out" theory. To be tested over the next few days.
As reccomended, I'll also start a new thread, because they aren't exactly ppsl.
I have drafted a design for a 2x18" PPSL, as per my thread I started, and hopefully I can get it drawn up properly (by hand as I haven't got the software/skills for rendering it on a computer!) in the near future.

I am pretty confident that it will have suitable output and sound good (although different to what I am used to and therefore may take some adjusting to!) but whether I can actually fit the drivers in easily on a box that I have commissioned and will arrive constructed, is another matter!
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Old 28th December 2013, 04:52 AM   #513
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djk, what frequency range do you think your Eminence Kappa Pro-15LF-2 15" PPSL is capable of? Also, what kind of output through that frequency is it capable of?

Thanks,
Jim
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Old 28th December 2013, 06:53 PM   #514
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Im not a regular but I built a double 12" PPSL using infinity 1230w 's. I tuned it a little higher so I could enjoy music rather than movies but it will serve both purposes. Since I cant seem to upload pictures on this site you can see it here> https://db.tt/Q81RN44a I haven't done any outdoor testing because of neighbours but perhaps someday.
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I like it loud, BUT NOT TOO LOUD!.... Hey do you hear that high pitched ringing sound ?

Last edited by Top Shelf; 28th December 2013 at 06:56 PM. Reason: more
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Old 29th December 2013, 08:54 AM   #515
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nice, where did you tune it ?
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Old 29th December 2013, 09:54 AM   #516
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Well originally I was going for a 23 hz f3 at around 10 cubic feet then I took a good listen and decided that it was a little lean at that point. So I cut the box down to 7.3 cubic feet and retuned it to 30 hz with a fairly flat response ( not too peaky). I listen to edm so it was more enjoyable with a higher tuning.
All outside walls are 1" plywood and internal bracing is 3/4" glued and screwed. Duratex coating to finish.
I made it over a year ago so all my notes are nicely filed somewhere in my trash heap I call a workdesk.
I think it put out 123 db @ 37 hz with somewhere around 50 volts input in 2pi(from memory)
Sounds nice and clean all the way down to about 18 hz where motor noise becomes audible.
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Old 18th May 2014, 02:22 PM   #517
MemX is offline MemX  United States
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Following on from my build thread:
Looking to build 2x18" enclosure - PPSL?
the guy putting them together for me is coming up to the point where the drivers will be fitted (I can't wait for them to be finished, it's worse than waiting for Christmas! )

Before we fit the drivers, can I ask...


... is there any benefit to lining the slot itself with some sort of foam or acoustically absorbent material?

The thinking being that bass will travel through any lining due to the length of the soundwaves, but any high(er) frequency sounds that may be emitted by the motors when being worked hard would be absorbed by the lining material and reduced, meaning they would sound a little cleaner?


Any input on this suggestion would be much appreciated, thank you very much in advance!

Last edited by MemX; 18th May 2014 at 02:25 PM.
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Old 18th May 2014, 09:44 PM   #518
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hmm.

it couldn't hurt to absorb some woofer mechanical noises.
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Old 17th June 2014, 06:51 PM   #519
MemX is offline MemX  United States
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Quote:
Originally Posted by norman bates View Post
hmm.

it couldn't hurt to absorb some woofer mechanical noises.
Thanks for the response, norman

I think I will try it without and see how it goes!

Annoyingly I saw a post earlier on that suggested adding three to six inches of absorbent material at the back of the slot, but I can't find it now...

(I think djk also suggested filling in the corners of the rear of the slot with fibreglass or similar??)
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Old 18th June 2014, 09:35 PM   #520
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Annoyingly I saw a post earlier on that suggested adding three to six inches of absorbent material at the back of the slot, but I can't find it now...
6 inches of absorbent material should be effective all the way down to 100 Hz. It should dramatically reduce the impact of the slot's geometry on the frequency response.
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