A Thread for those interested in PPSL enclosures - Page 55 - diyAudio
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Old 21st June 2014, 02:05 AM   #541
djk is offline djk
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I would be concerned at the higher frequencies that they wouldn't come out the front like they would without the port.

Have to build a test box to find out for sure.
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Old 22nd June 2014, 03:08 AM   #542
MemX is offline MemX  United Kingdom
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Thanks for the input, both

Quote:
Originally Posted by weltersys View Post
In Hornresp, S1 is the area at the back of the "horn" (or plenum) S2 is the center of the drivers, S3 to S5 can be the baffle face. Using more than 3 points allow for experimenting with a flared exit.
Noted for future reference!


Quote:
Originally Posted by weltersys View Post
Crossover points are always a compromise, if top speakers can't go below 400 Hz (well into the vocal range) without the level desired, I'd probably use front loaded rather than slot loaded woofers.
Quote:
Originally Posted by djk
I would be concerned at the higher frequencies that they wouldn't come out the front like they would without the port.

Have to build a test box to find out for sure.
I think I should (hopefully) be fine with regards to levels because I am already running M&K speakers rated down to 80Hz or so (IIRC) and my current setup has them crossed over between 100Hz (LCR) and 150Hz (Surrounds) with decent results

My box building guy is onto the veneering stage of building the subs now, then there are some risers to build, connections and cabling to sort, and then getting them stacked on top of each other ,lol
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Old 16th July 2014, 10:54 AM   #543
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new toy.

Click the image to open in full size.
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Old 16th July 2014, 12:25 PM   #544
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Any more info?
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Old 16th July 2014, 12:56 PM   #545
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4x12" dayton st305 series 2 i think (8mm, low qts).

12ft3 tuned around 28hz (f9).
I've yet to hook up boost/highpass (+6db at 28hz then subsonic filter below that). With room gain, it sounds like a lean deep sealed, but very clean. Instant improvement over shorting ringed double 15's tuned to 27hz. It disappears audibly too.

Simulates 1,200 watts to skip past xmax around 40hz.

I've yet to crank it, but this weekend I will.
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Old 16th July 2014, 01:21 PM   #546
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by norman bates View Post
4x12" dayton st305 series 2 i think (8mm, low qts).

12ft3 tuned around 28hz (f9).
I've yet to hook up boost/highpass (+6db at 28hz then subsonic filter below that). With room gain, it sounds like a lean deep sealed, but very clean. Instant improvement over shorting ringed double 15's tuned to 27hz. It disappears audibly too.

Simulates 1,200 watts to skip past xmax around 40hz.

I've yet to crank it, but this weekend I will.

Very nice! Is it a sealed box with the push pull drivers in a slot that is not connected to rear volume? What are the dimensions of the slot?
Must sound very nice.
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Old 16th July 2014, 10:04 PM   #547
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Thanks.

nope, ported to 28hz.

All of the drivers share the same box volume.

Slot is just big enough to fit the drivers.
Port on the bottom runs the width of the box.
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Old 16th July 2014, 10:11 PM   #548
Scott L is offline Scott L  United States
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Default upper limit ?

Quote:
Originally Posted by norman bates View Post
Thanks.

nope, ported to 28hz.

All of the drivers share the same box volume.

Slot is just big enough to fit the drivers.
Port on the bottom runs the width of the box.
Hi Norman,
I would be VERY interested in hearing what you think the upper frequency coverage could/or/should be (?)
Both by measuring and by subjective observations. Nice work, by the way !
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Old 17th July 2014, 01:24 AM   #549
MemX is offline MemX  United Kingdom
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That looks ace, nicely made

I'm still slightly confused by making PPSL boxes ported - I thought that the phase shift etc around the box tune would make them sound less clean, which is the whole point of PPSL??


(I am n00b, though, so am probably wrong... lol)
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Old 17th July 2014, 02:32 AM   #550
xrk971 is online now xrk971  United States
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There are several variants of PPSL speakers. There is the sealed where slot acts as depression in otherwise sealed box (PPSL-S), the bandpass SL (PPSL-BP) where the vent goes through the a slot, the separate vented like the one shown by Norman Bates here (PPSL-BR), the open back or open baffle slot loaded (PPSL-OB) speaker, and I am sure there is yet another one. Maybe we need specific names for all of these?
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