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Old 23rd January 2008, 05:29 PM   #1
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Default Driver for Isobarik use

What values of which T/S parameters should I consider when looking for a subwoofer driver to be used in isobarik configuration.
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Old 23rd January 2008, 08:58 PM   #2
BHTX is offline BHTX  United States
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Isobarik configuration doesn't really require specific parameters.
Just design the enclosure as you normally would for a given driver, except VAS will be greatly reduced. Two woofers in an isobarik clamshell config will only require half the space of one of those woofers. If you're planning on going the clamshell (face to face) route to obtain the reduction of distortion that's associated with it, or any time a driver's motor structure will be exposed, you should generally try to use drivers that are 'quiet' in operation, without excess mechanical noise from movement of the driver's parts, or from the movement of air through parts of the woofer, especially the vented pole piece (if it has one). Of course, I suppose the importance of this depends on the application. For instance, these mechanical noises are usually much less noticable in a mobile environment. Also make sure that neither of the woofer's surrounds will come in contact with each other when mounted. Also keep in mind that efficiency is greatly reduced, but power handling is greatly increased. It takes A LOT more power to drive a system like this. Mess around with WinISD Pro for a bit and model an Isobarik config to get a good idea of what to expect.
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Old 24th January 2008, 09:00 PM   #3
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Are there any "signs" that will tell that a particular driver might be noisy?
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Old 24th January 2008, 09:22 PM   #4
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Instead of clamshell mounting you could make a small tunnel and mount drivers magnet to magnet. This would avoid the chassis turbulence noise issue.
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Old 25th January 2008, 03:41 AM   #5
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Quote:
Originally posted by buggsson
Are there any "signs" that will tell that a particular driver might be noisy?

Really just depends on the design of the motor structure. Some subs have more mechanical noise than others.
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Old 25th January 2008, 05:52 AM   #6
simon5 is offline simon5  Canada
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Quote:
Originally posted by richie00boy
Instead of clamshell mounting you could make a small tunnel and mount drivers magnet to magnet. This would avoid the chassis turbulence noise issue.
You are right but then you lose most advantages of isobaric since air is loosely coupled and also power dissipation is greatly reduced.
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Old 25th January 2008, 06:07 AM   #7
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"You are right but then you lose most advantages of isobaric since air is loosely coupled and also power dissipation is greatly reduced."

Not only that, But also the added volume .

I highly suggest you find a sub or woofer that dont need too much box volume in the first place.
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Old 25th January 2008, 06:46 AM   #8
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re: price, I like the 10" vifa very much. I have mounted them back to front.
Down to 20Hz, depending on location -5 db to flat response.
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Old 26th January 2008, 10:53 AM   #9
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Which Vifa model number?
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Old 26th January 2008, 02:49 PM   #10
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Been some time that I build my two subs, it was P25W series.
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