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Multi-Way Conventional loudspeakers with crossovers

how many Liters for my 15"
how many Liters for my 15"
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Old 12th August 2019, 05:51 PM   #1
alexfisher7 is offline alexfisher7
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Default how many Liters for my 15"

So.... Hum, Hum.
I am sure this has been (and will be)covered a thousand time over but can t find any even half-set rules about:
How many liters should I build my trapezoid speaker box to host a 15" speaker.
or more like how small can I get away with.

I will:
use birch ply 18mm
brace da living poop at of it.
vent it using a four corners config
separate the top from the 15".
thank you.
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Old 12th August 2019, 06:31 PM   #2
fatmarley is offline fatmarley  England
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You need to know the thiele small parameters to model an enclosure. The t/s parameters are usually found in the manufacturers data sheet.
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Old 12th August 2019, 06:36 PM   #3
Lojzek is offline Lojzek  Croatia
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You can pretty much count on 100 litres vented for a decent design.
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Old 12th August 2019, 06:51 PM   #4
alexfisher7 is offline alexfisher7
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http://www.jblproservice.com/pdf/Dis...ls/2035HPL.pdf
That s all I could find.
And a diagram for their own cab but with such a different configuration that it is not much help to me.
I guess another question is: what suffers if the cab get smaller? My guess is less bottom but a little more close range pressure???
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Old 12th August 2019, 07:18 PM   #5
Cal Weldon is offline Cal Weldon  Canada
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how many Liters for my 15"
Here's what you need. Took 30 seconds to find. Google is your friend.
Subwoofer JBL 2035HPL specifications.
Remember with JBL that the black terminal is the +
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Old 12th August 2019, 07:21 PM   #6
Lojzek is offline Lojzek  Croatia
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JBL 2035 hpl twin 15" open baffle MTM
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Old 12th August 2019, 07:28 PM   #7
alexfisher7 is offline alexfisher7
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I did try google but couldn t find this...
Well who is feeling like a silly goose now..
Thanks a lot.
And thanks for the JBL exotic polarity tip as well. did not know that so all worth it...


Ta ta.
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Old 12th August 2019, 07:37 PM   #8
Cal Weldon is offline Cal Weldon  Canada
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how many Liters for my 15"
Alex, AFAIK, they're the only ones who do that. Seems counterintuitive but they are well respected and have been doing it for all the time I've been in this hobby.
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Old 12th August 2019, 07:46 PM   #9
alexfisher7 is offline alexfisher7
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just out of curiousity tho.
some calculator ask if the cab has bracings so if it does, reduces the volume of the cab. I am a wood worker so (not too brag but) the cab will be built to a quiet high standard with rigidity in mind. Is it worth taking in considaration?
I am not looking for an in depth awnser of cours as I imagine I would be lacking the knowlege 3 words in but you know...

Thanks for your time.
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Old 12th August 2019, 08:08 PM   #10
Cal Weldon is offline Cal Weldon  Canada
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how many Liters for my 15"
If you are going to use shelf braces then yes add internal volume to compensate. Stick or dowel braces not so much if you then have to redraw your plans. Unless you're only increasing one dimension that is.

Last edited by Cal Weldon; 12th August 2019 at 08:09 PM. Reason: added
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