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A Thread for those interested in PPSL enclosures
A Thread for those interested in PPSL enclosures
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Old 13th June 2018, 07:40 PM   #821
Etocynned is offline Etocynned
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Old 24th June 2018, 05:30 PM   #822
Decker is offline Decker  United States
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Forgive me if this question has been answered before. I have tried to read the entire thread but may have missed it. How high in frequency can you run a PPSL? Is it only useful as a subwoofer, or can it be used as a woofer below a midrange? Also, does the size of the baffle opening matter? Does it need to be "tuned" for different woofers?
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Old 24th June 2018, 06:31 PM   #823
weltersys is offline weltersys  United States
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Quote:
Originally Posted by Decker View Post
Forgive me if this question has been answered before. I have tried to read the entire thread but may have missed it.
1)How high in frequency can you run a PPSL?
2)Is it only useful as a subwoofer, or can it be used as a woofer below a midrange?
3)Also, does the size of the baffle opening matter?
4)Does it need to be "tuned" for different woofers?
1)Depending on the size of the plenum (slot) 300 Hz would be near the upper limit for 15" drivers.
2) Depends on the drivers, and what you consider "midrange".
3) Yes. A few examples of simulated frequency response can be seen in posts #779 and #796 using 18" and 15" drivers. In all cases, there will be an increase in upper bass caused by the plenum, followed by a drop in response, a deep cancellation that won't respond well to EQ, limiting the upper response.
4)Optimum Fb (box tuning) is driver dependent, optimum plenum size is generally as small as possible for the drivers chosen. The upper "horn gain" of the plenum must be weighed against the reduction of cabinet volume it uses, which reduces the LF output.

The example below is an actual outdoor measurement of a 2x15" PPSL, the upper response peaks between 160-200Hz, followed by a 23dB dip at 400 Hz, and rough response above.

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File Type: png 2x15" PPSL "Shoehorn".png (95.9 KB, 88 views)

Last edited by weltersys; 24th June 2018 at 06:34 PM.
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Old 24th June 2018, 07:32 PM   #824
Decker is offline Decker  United States
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