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Old 28th November 2007, 02:20 PM   #1
Clipped is offline Clipped  Thailand
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Default Isobaric, whatcha think?

going through alot of different designs in my mind, i have 6 subs ready to go in..recently i was thinking about doing 3 iso pairs.

whats the downfalls of iso?

which do you think woud be louder 6 normal subs, or 3 iso pairs?

both would be in the optimum enclosures...im trying to figure out if the extra motor force from the iso's would be beneficial in any way other than a smaller enclosure.

thanx
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Old 28th November 2007, 05:06 PM   #2
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Isobaric is good for small drivers. It lowers the Fs.
For example: you have an 8" sub with Fs of 50Hz, for an iso setup
with 2 of the same 8" drivers, multiply the Fs by .707... so your new
Fs is 35.35 for the same enclosure volume.

Or, you could reduce the enclosure volume when using the iso setup.
I'm not an expert and never built any speaker cabs that were iso, but
I read something about them on wikipedia.
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Old 28th November 2007, 05:14 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

6 normal subs maximum level is louder than 3 isobaric by 6dB.
ispobaric is moreorless the same a 3 normal drivers.

Isobaric does not lower Fbox. It allows the correctly designed Fbox
for the alignment to be realised by a cabinet of ~ half the volume.

/sreten.
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Old 28th November 2007, 05:19 PM   #4
TWOJZ is offline TWOJZ  Australia
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isobaric is 6dB quieter than a single driver for the same power input, ofcourse, the isobaric has two speakers working as one, so you can give it twice the power, meaning its only 3dB quieter.

having said that, SIX woofers in a "normal" box will need four times the box volume that an isobaric enclosure with three pairs would need...

and three pairs of speakers in an isobaric setup would be 9dB less efficient than the same six woofers in a normal box, and would still only handle the same power.
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Old 29th November 2007, 12:15 AM   #5
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http://en.wikipedia.org/wiki/Isobaric_speakers
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Old 29th November 2007, 03:17 AM   #6
ppia600 is offline ppia600  United States
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Isobarics are pointless nowadays, we have what I like to call "electronic crossovers".
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Old 29th November 2007, 03:23 AM   #7
adason is offline adason  United States
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isobaric subwoofers and electronic crossovers has nothing to do which each other
you must be confused with band-pass enclosures which limit upper fr response
get you knowledge staight
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Old 29th November 2007, 03:33 AM   #8
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That Wikipeadia article is out to lunch...

Fs remains the same
Vas is halved
Mms is doubled
BL is doubled

The net result is that you can get the same bass out of a box with a NET volume of 1/2 that of a sible driver.

dave
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Old 29th November 2007, 03:35 AM   #9
adason is offline adason  United States
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thats right, Fs is the same
the volume of the box required to obtain the same low fr extension is half
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Old 29th November 2007, 04:05 AM   #10
ppia600 is offline ppia600  United States
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I understand the difference, but seems like a lot of extra work when you can just use time correction and eq, or just buy a single solobaric type woofer. But I guess sometimes its just fun to have a project. Either way you need to use more power, correct?
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