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Old 27th April 2005, 11:51 PM   #1
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Default isobaric damping..

im currently using a peice of carpet underpadding as a seperator for an isobaric enclosure. does this assist in damping/could this possibly cause mechanical damage?
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Old 28th April 2005, 01:27 AM   #2
Stocker is offline Stocker  United States
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Old 28th April 2005, 02:13 AM   #3
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what do you men by "seperator".
What do you seperate in an isobarik chamber?
Do you mount back to front, front to front?
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Old 28th April 2005, 08:43 PM   #4
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Default more info..

2 12"s in a clamshell with the underpadding in between so that the 2 subs do not touch each other physically..

QTS .6
Vas 3.645 ft^3
Fs. 25.90

in a 3 cu. ft enclosure
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Old 29th April 2005, 02:14 AM   #5
Stocker is offline Stocker  United States
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Use a spacer to ensure that they do not touch. Try a ring of MDF or something similar, sealed with weatherstripping or silicone that has cured before installing the ring. easier yet, install one driver inside and one driver outside and the cabinet itself keeps the two apart. Carpet underpadding here is a little silly.
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Old 29th April 2005, 06:12 AM   #6
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Quote:
Originally posted by Stocker
easier yet, install one driver inside and one driver outside and the cabinet itself keeps the two apart.
That is how i plan on doing it... it does mean a panel has to be removable which is a different complication.

In my case i'm working on figuring out the logistic of mounting 4 12s in a push-pull-push-push isobarik... probably a removable bottom panel.

dave
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Old 2nd January 2006, 06:02 AM   #7
caratje is offline caratje  Netherlands
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Hi Dave,

I don't want to go for 4 x 12s, but am pretty curious what kind of layout you were thinking of.

Oh, I am considering a TL with 2 x 12s, but also don't know yet what be the best configuration.

Best regards,

Caratje
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Old 2nd January 2006, 09:04 PM   #8
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Quote:
Originally posted by caratje
but am pretty curious what kind of layout you were thinking of.

Oh, I am considering a TL with 2 x 12s, but also don't know yet what be the best configuration.
B would be my 1st choice, C if the drivers excursion wasn't very linear.

My arrangement attached. I know that a pr of these drivers work well in a 2.5 ft^3 aperiodic box, so i'm currently pointed at a ~1.5 ft^3 box for this... but we'll see once i get a set of 8 selected from my stash (17 drivers so far i believe)

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Old 3rd January 2006, 01:47 AM   #9
caratje is offline caratje  Netherlands
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Hi Dave,

Don't you think A will have a broader optimum, with two unequal offsets? (given MJ King's modelling) Or you assume that simply more pushing power at the optimum offset is more important/effective?

Oh, with a pipe construction it is easier to make a TL with two woofers using an identical offset (very small), but if you make wooden/MDF cabinet, two different offset might even be easier. I have also seen design, basically using two separated TLs with slightly different length/offset.

Best regards,

Caratje
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Old 4th January 2006, 12:30 AM   #10
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I'm a big fan of push-push driver mounting, so that is why i picked B. Whether that (with 2 units of 3rd suppression) trumps knocking out a unit of 3rd & a unit of 5th is a matter of bbuild and try.

dave
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