I've been keeping up with the ABC box thread
and I think I might give it a shot. I was
wondering if anyone knew of a good enclosure
design program for accurately designing
ported enclosures. Could I get away with
using the mathematical formulas? I'm looking
for *real* cheap here. :-) I've got some
old Orion Cobalt 12s to test with. I don't
know the parameters, so I'll be going with
a pretty generic box volume :-( Can anyone
help?

My other question is the tuning frequency.
Originally Dukk was talking about 30hz and
57hz (1.9 x 30hz). Could I go lower? Say
25hz or even 20hz? This is probably geared
toward someone with alot of experience with
them (ehem! Dukk???). Do I need to do
anything special when designing an ABC for
frequencies that low? I'll be running 60hz
on down on the subs. I definitely want
good SQ, but the SPL advantage of a ported
enclosure has me intrigued. :-)

I'll be putting this in the back of a '94
Camaro. I should have plenty of room for
at least a single clamshelled ABC. Can
you guys help me out?

Thanks alot! I appreciate all the help I
can get.

Iz

Y'know, look around - there's plenty of decent free software around on the 'net.

Also, I have Cobalts in my database. Are they the original series or 2 or 3? Also, SVC or DVC?

Finally, you are running a nasty combination of ISO, low tuning, ABC, and marginal ported driver. This leaves a pretty small box with HUGE ports! My recommendation would to not go ISO and leave base tuning at 30Hz. Let me know what series woofer that is and how much space you have to spare...

------------------

And that's the bottom line, cuz:
LORD DUKK SAYS SO!

The Big Show
The Dukk says: Know your bass: PORT your damn box!!
Have HoleSaw, Will Travel!

I've seen quite a few different software
programs, but wasn't sure which was most
accurate. I've done some "mock" enclosures
on them and get different results on each
one. I wasn't sure which one to trust. :-)

I'm not sure which Cobalts I have. They're
pretty old dual voice coil drivers. I bought
them about four years ago (I know... time
for new ones).

ISO was just a thought. I thought I might
be able to tighten up the bass a little
like that. I originally thought of going
with both of them firing straight up in
an ABC with a shared main chamber. I wasn't
sure of the ideal box size though. I figured
being an older sub, they would require
quite a bit of space.

When I originally bought the subs, I got
a sealed enclosure -- a little over 2 cu. ft.
shared space. It sounded alright, nothing
special. It sounded like a fair pair of
12's. I thought I'd try something different.
Maybe something with a little more umph!
Know what I mean? I figured, "hey! I'll
port my box!" -- 'cause Lord Dukk Says so!!!

Thanks again Dukk.

Iz