" said:


I calculated 130 liters, closed box.
Q is a little lower than recommended.


Adire used to have a paper on their website with 3 subwoofer designs for the
Shiva, the largest being a 141.48 Liter downfiring (as were all of their
designs) box tuned to 22 Hz IIRC that combined with room gain gave response
down to 18Hz, so your box is probably right in the ballpark. There are
several Shiva based designs up on the web if you decide to take a look at
how some other folks did it, especially with the tubes.


I used Win ISD for the calculations, and they seem to be about right
for the 12D4.


Good luck.


Thanks, I'll need it (flowers can be sent to a yet to be determined
hospital) ;-)

--

- Never argue with idiots, they drag you down their level and beat you with experience. -