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Old 26th May 2011, 05:10 PM   #81
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Hi revboden,

I'm looking at this exact shape to experiment with as a manifold design for a PPSL-IB build. Would contain one pair of 21SW152-4 drivers.

Larry

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djk, ever tried a slot shaped like this

(one side cutout to show detail)
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Old 26th May 2011, 10:25 PM   #82
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Originally Posted by LarryMcConville View Post
Hi revboden,

I'm looking at this exact shape to experiment with as a manifold design for a PPSL-IB build. Would contain one pair of 21SW152-4 drivers.

Larry
(retrieves jaw from floor)
That should be something...
It's hard to see but the design I posted utilizes a semi Parabolic trough.
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Old 26th May 2011, 11:27 PM   #83
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larry,
I just finished the math.. keep the driver as close to the "back wall / reflector" as possible.
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Old 27th May 2011, 12:37 AM   #84
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larry, you inspired me to do some more maths.
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Old 27th May 2011, 01:26 AM   #85
tb46 is offline tb46  United States
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Hi,

You can also trade of width v. height in the opening:

Regards,
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Old 27th May 2011, 01:34 AM   #86
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Hi,

You can also trade of width v. height in the opening:

Regards,
er? trade of width
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Old 27th May 2011, 01:55 AM   #87
djk is offline djk
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Tricks to reduce the rear corner volume of the plenum are to extend the midrange response, are you planning on running a pair of 21SW152-4 up into the midrange?
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Old 27th May 2011, 02:30 AM   #88
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Tricks to reduce the rear corner volume of the plenum are to extend the midrange response, are you planning on running a pair of 21SW152-4 up into the midrange?
I wonder if it's possible to treat the cavity resonance by another means? For example, extend the cavity a bit, then fill it with just enough damping material to tame the resonance? Or is that too much bother for what can be dealt with via active filtering?
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Old 27th May 2011, 03:37 AM   #89
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djk,

Was this inquiry for me? If so, no sir; purely aesthetic in nature. If not wise to pursue, I certainly will not do so.

I have no plans to run the IB > ~100Hz; ultimately, I'll utilize quad 21SW152-4 experimenting with LPF to best compliment my mains (Danley SH50/SH69/SH50).

I have no experience with an IB install; I plan to run one pair in IB, and a second pair in 12 cubes sealed. I'll measure and listen for which alignment I prefer. Regardless of install, the drivers shall enjoy a PPSL orientation...

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Tricks to reduce the rear corner volume of the plenum are to extend the midrange response, are you planning on running a pair of 21SW152-4 up into the midrange?
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Old 27th May 2011, 03:49 AM   #90
tb46 is offline tb46  United States
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Default Post #86

Hi revboden,

Sorry I didn't make myself clearer, maybe this will help:

Regards,
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