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Old 2nd March 2004, 04:09 PM   #1
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Location: northern israel
Default Help with driver choice.

I'm totally new to this DIY stuff. Please bear with this newbie.

I want to build a subwoofer (wow, how original) and pretty much the only reasonable drivers I can find are these:

1. KEF B139 plus a matching passive radiator
2. Shiva MkIII

The price for both units is the same. Which would be the best choice, and in what enclosure?

Thanks!
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Old 2nd March 2004, 04:22 PM   #2
sreten is offline sreten  United Kingdom
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Utterly no contest, at all.

The B139 does not make a good sub, especially a PR one.

I can't find the Mkiii specs as yet but I be very surprised if they
were not vastly more suited to a sub. will keep you posted,
but I believe the Shiva suits around a 50L sealed box and a
100L to 150L reflexed / vented box.

Just can't find the parameters.

sreten.
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Old 2nd March 2004, 04:29 PM   #3
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KEFs are used in the Perfectionist Audio subwoofer and a number of other respectable designs, that's why I didn't dismiss this unit out of hand. All of them are TL designs without the PR though (but then there's always an option to ditch the PR...)
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Old 2nd March 2004, 04:55 PM   #4
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Shiva MkIV specs shouldn't be different from the MkIII.

Re 2.9 ohms
Le 2.12 mH
Qms 6.5
Mms 125 grams
Qes 0.40
Cms 0.47 mm/N
Qts 0.38
Rms 2.54 N*s/m
Fs 21 Hz
Sd 481 cm^2
Vas 151 liters
BL 11.30
Xmax 16.6 mm one way
EBP 51
SPL 87.3 dB @ 1W/1m
No 0.37%
Pmax 375W per voice coil; 650W total to the driver

The Perfectionist Sub looks a lot like this one. Maybe 'cuz it's the same design based on the Fried Model H sub.
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Old 2nd March 2004, 05:34 PM   #5
sreten is offline sreten  United Kingdom
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THe B139 specs are here :
http://homepage.mac.com/tlinespeaker...139B_newer.gif

I don't think its much of a contest.

Details of designs and boxes for the shiva can be found here :

http://www.adireaudio.com/tech_papers/shiva_apps.htm

sreten.
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Old 2nd March 2004, 10:18 PM   #6
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The shivas xmax is more then four times the kefs, alsmost 5 times! I know that old kef driver is/was highly regarded, but nowadays it just cant keep up.
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