10" PPSL Vented Enclosure Design Help - diyAudio
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Old 20th July 2013, 04:31 AM   #1
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Default 10" PPSL Vented Enclosure Design Help

So I've got a couple older Polk 10" drivers sitting around and I'd like to build a vented push-pull slot loaded (PPSL) enclosure for them as something new. Since I've already got the drivers and the building materials all it will cost me is my time. I'll be using this sub for music and a little HT. The room it will be going in is pretty small (150 sq ft.)

I've attached a picture of what I've designed so far. The size is what will fit in my rather cramped room nicely. What I was like to know from the hive mind is if there is anything glaringly wrong with my design. It has 3 cu ft of internal volume and should be tuned to 32 hz. My biggest concern is since the enclosure is kinda tall I might get some weird quarter wave stuff going on. Any input will be greatly appreciated.
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Old 20th July 2013, 04:41 AM   #2
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your HR input screen would help analyze your design
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Old 20th July 2013, 05:15 AM   #3
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Quote:
Originally Posted by TundraLTD View Post
your HR input screen would help analyze your design
Here ya go.
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Old 20th July 2013, 05:30 AM   #4
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by thejessman View Post
My biggest concern is since the enclosure is kinda tall I might get some weird quarter wave stuff going on.
what happens if you have two ports, one at each end ?
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Old 20th July 2013, 06:10 AM   #5
OscarS is offline OscarS  United States
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looks good from here.
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Old 20th July 2013, 06:47 AM   #6
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Wouldn't you want to tune lower for HT?
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Old 20th July 2013, 09:42 AM   #7
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eh.
27hz was low enough for me.
That rolloff was 24db for the port and 12db for the filter.
30hz tone shook everything, but 20hz was gone.

Norman
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Old 20th July 2013, 11:52 PM   #8
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Originally Posted by tinitus View Post
what happens if you have two ports, one at each end ?
That's an interesting idea. I'll have to see how that will work out with my layout.
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Old 23rd July 2013, 10:41 PM   #9
badman is offline badman  United States
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I would keep the drivers oriented "normally" and possibly widen and shorten the enclosure. I have used drivers vertically but it's best avoided when possible.
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Old 24th July 2013, 05:58 PM   #10
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Originally Posted by badman View Post
I would keep the drivers oriented "normally" and possibly widen and shorten the enclosure. I have used drivers vertically but it's best avoided when possible.
A "normal" driver mounting has the cones in a vertical orientation.
Cones mounted horizontally, as in the OP's drawing, tend to sag downward.
When the cone "sets" in a sagging position, Xmax on the downward portion of the signal is reduced.
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