Help with driver choice.

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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!
 
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.
 
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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