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Old 28th March 2005, 06:05 PM   #1
K-amps is offline K-amps  United States
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Lightbulb Newbie needs help!

I am trying to build a subwoofer around 4 of these 8" Onkyo's:

http://www.apexjr.com/speakerstuff.html (scroll to the bottom to the 8" Onkyos.)

Specs given are: Onkyo 8" Butyl/poly cone 100Watt RMS 4 ohm30Hz-2Khz Vas 14-16 Ltrs QTS .581 and X-max 6mm used in the Aperion Audio Imunus S8 8" powered Subwoofer:

I want to use 4 of them in a Tall floor stander in an ISOBARIC configuration.

On the outside only 2 woofers will be visible but will be "helped" by 2 additional driver in the rear, configured in an Isobaric arrangement.

Question:

To get a -3db roll off at 30Hz, what enclosure size am I looking at for both the main and the Isobaric areas.

The rough shape I am looking at building is in the MS paint diagram (pls excuse the bad quality... I do not have a modelling software) attached as zip.

I'd like a profile thats not more than 10" wide and 14" deep.

Can anyone help?
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File Type: zip isobaric.zip (4.5 KB, 14 views)
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Old 28th March 2005, 06:28 PM   #2
K-amps is offline K-amps  United States
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Now that I have read a few other posts, I am open to any 8-10" sub (4 ohms) for the Isobaric design.

My objective is deep (non-boomy) bass in a small foot print.

Thanks a bunch in advance...
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Old 4th April 2005, 03:31 AM   #3
K-amps is offline K-amps  United States
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OK, guys please slow down, I am overwhelmed by the flood of responses...
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Old 4th April 2005, 04:09 AM   #4
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Not many people are interested in opening zip files.
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Old 4th April 2005, 04:46 AM   #5
RJ is offline RJ  United States
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Not enough parameters to model a box.
Nice looking speakers though.
I would probably build a box like this feller did;
http://www.betteraudio.com/geolemon/isobp/isobp.htm
Or if you still want a sealed I'd build it clam shell with two equal sized chambers, no ports but the center would be open ( no plexiglass)...
It would sort of look like a horn type speaker..

Another site for ideas;
http://www.jlaudio.com/tutorials/isobarik/clam.html

I wonder if you contacted Apex Jr. if they could supply the rest of the parameters or an idea to a box size. Isobariks are usually 1/2 the size of a modelled speaker closed or ported.
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Old 4th April 2005, 12:13 PM   #6
K-amps is offline K-amps  United States
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Thanks RJ

I think I am going for something like the Piggy-Back arrangement if I go Isobarik. I am not a bandpass fan. These will be for a home/ music system, so aesthetics are also important.

If not Isobarik, and I go four 8" ers in a line array, do you have any suggestions for woofers/ enclosures with known parameters, good looks etc that I can scale up?

Bill, for you only the same file in jpeg format.

RJ, I have written to Steve for T/S lets see.

thanks guys.
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File Type: jpg isobaric.jpg (10.3 KB, 79 views)
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Old 4th April 2005, 01:03 PM   #7
K-amps is offline K-amps  United States
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Default 8X12 TB driver.

I just saw this, since I was looking for a 8" wide driver, perhaps I could use 2 of these: http://www.tb-speaker.com/detail/1208_03/w8q-1071.htm

Has all T/S on the web-page. What size enclosure am I looking at for a single driver -3db at 25-30Hz? (I will extrapolate the Isobric enclosure from that). thanks!
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