A Thread for those interested in PPSL enclosures - Page 30 - diyAudio
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Old 12th June 2012, 09:27 PM   #291
Scott L is offline Scott L  United States
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Default plenum

Quote:
Originally Posted by TMHutson View Post
Scott, what made you decide on a deeper plenum (hornresp modeling)? Would making it more shallow effect the sound? I would be curious to see various testing on plenums.
I am happy to hear you guys are getting higher flat response than TH's, folded horns and the like. I need a sub that can go reasonably deep (I only care about music at this point so 25-30 is ok), but also cross over higher than 100 if I decide to fool around with crossover points...
I guess I should build something and figure it out on my own, right?
Hi Tim,
When you have plenty of time, read the whole thread: beginning to current.
This particular ppsl is the motor to drive a mid-bass horn, and the apex of the ppsl is stuffed with acoustic. IMO the beauty of the ppsl principle is that it is versatile. I have limited experience compared to others, but I think the real virtue of this design is a woofer (sub?)-woofer section of an active system.
I think a decade is the limit, so for an F3 of 25, think 250 Hz tops, and probably better off running only to about 125 Hz.
I really don't understand tapped horns- they don't make a bit of sense to me, but a ppsl is a true gem. I personally audtioned a pair built by Les Hudson
(while I was down at Axpona, in Atlanta, and they were truely remarkable.
... And yes, I would encourage you to build. I place a whole lot more value on creating saw dust than I do running "sims". Happy Listening
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Old 13th June 2012, 02:23 AM   #292
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[QUOTE=epa;3052501]ive made a sketch of what i had in mind.
Click the image to open in full size.
Click the image to open in full size.
just a bit worried about the plenum opening being about 2:1
driver 18 sound 18lw1400[/QUOTE

Your sketch looks a bit like my recent build
I used 12's though.
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Last edited by Top Shelf; 13th June 2012 at 02:28 AM.
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Old 24th June 2012, 04:30 PM   #293
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Default Still would be helpful

I'm poised with saw in hand but having a tough time trying to model the details that DjK provides for various speakers from BBPro into an actual box using the same software. Maybe I don't know how to use the software, but I am not able to get it to produce useable box sizes-it keeps making one dimension too small to fit the 15" JBL 2226h drivers. Is there some trick to forcing the software to hold 2 of 3 dimensions and add the 3rd to = the chosen Vb? Also, am I supposed to subtract the vol of the plenum from the box total Vb? Or could someone just model this in BBpro and send the file to me? thanks.

Quote:
Originally Posted by jdubs View Post
djk! Thanks!! Hugely helpful. Now, just one more favor (not just for me, but the community at large!) Can you do a cut list for a vertically oriented cabinet following these design parameters? Similar to what you did for the PA cabinet, here, but higher than wide (better for most home setups):

A Thread for those interested in PPSL enclosures

Seriously, you would then have provided detailed plans for both PA and home system cabinets. This would be great for LOTS of people!

Thank you again.

Jim
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Old 24th June 2012, 05:01 PM   #294
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i am wondering has anyone tried PPSL approach with smaller drivers - 8" or 10" that plays deep into 20s? i'm a bit paranoid about bass overpowering my smallish room - 22m2, 3.3m ceiling - and on top i think there was a commercial loudspeaker manufacturer (from ukraine methinks) at munich audio fair with a 3 way speakers incorporating a PPSL box with 2x8" inside

what i've found so far is a dayton cheap woofer with 7mm Xmax with 27 Hz Fs and a .37 Qts though low efficency (around 88db/w)

Dayton RS225S-8 8" Reference Shielded Woofer 8 295-366

is there anything with a higher efficiency that would suit PPSL and still go deep? anyone tried to built a smaller PPSL?
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Old 24th June 2012, 09:49 PM   #295
seanny is offline seanny  United States
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Search for 'spl_max 1.xls and play with it so you"ll get an idea how deep a 10" go.
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Old 25th June 2012, 01:39 AM   #296
djk is offline djk
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"is there anything with a higher efficiency that would suit PPSL and still go deep? anyone tried to built a smaller PPSL? "

I've built a double 8 shielded PPSL that was a stand for a CRT TV. It worked fine within the limits of the cabinet size and driver capabilities.

AudioPro used to sell a PP dual 6=1/2" design (not SL), very limited output capability.

Click the image to open in full size.

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Old 26th June 2012, 11:34 PM   #297
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What are your true feelings on the recent talk I have been reading that some people don't like the PPSL's due to the 3rd order harmonics becoming more audible due to reduction of 2nd order, and better woofers don't need slot loading? I see talk, but have not done a lot of reading on the claims. I don't know know much about all the different types of harmonics and whatnot enough to care at the moment. I am mainly interested in the enclosure motion cancelling design of push push and PPSL cabinets.... I also don't currently have testing equipment to argue such points, either
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Old 26th June 2012, 11:43 PM   #298
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Ken Kresiel just jumped back into the fray with a new line of 'push - pull' subwoofers.

Welcome to the KEN KREISEL Sound Store
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Last edited by Carl_Huff; 26th June 2012 at 11:45 PM.
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Old 27th June 2012, 12:00 AM   #299
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Interesting. I thought they were long gone... I keep seeing old subs at swapmeets. Most woofers are replaced with cheap car subs, and no satellites
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Old 27th June 2012, 01:18 AM   #300
FE3T is offline FE3T  Norway
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Quote:
Originally Posted by djk View Post
AudioPro used to sell a PP dual 6=1/2" design (not SL), very limited output capabillties

This has 4 8"

Click the image to open in full size.
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