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Buck
12-30-2009, 12:16 PM
If I was to do a 4th order with my IA 21", what would the two airspaces be as well as the tuning? Just trying to get a general number.

KHARPS
12-30-2009, 12:22 PM
My guess would be HUGE. Hit up 80inches, gmonk, or iamamp3pimp. Probably around 4 sealed and the biggest ported section you can fit. I'm just guessing based on what I've learned from those 3 guys.

80INCHES
12-31-2009, 02:03 AM
u hit the nail on the head kharps

80

galacticmonkey
12-31-2009, 02:11 AM
Ive heard 21" DPs and Wardens before, but never personally built or designed anything for them.

To be honest all I did for my truck was this... Got my biggest dimensions, then went as small as possible sealed and used all the rest ported. Around 25in^ of port per cubic foot of ported airspace works good for me. I like a 45-50hz tuning personally.

So something like 3-4.5 cubes sealed is what I would guess for the back chamber. Then just as big as possible for the ported. Again, thats just a guess. I think Robin would be better for this one as he owns some 21" Wardens and has some experience with them.

Buck
01-02-2010, 01:42 PM
Now I may be getting a BTL

galacticmonkey
01-02-2010, 02:27 PM
Let me know when you need a design for that. My BTL 18s are doing great in the bandpass.

Buck
01-02-2010, 07:32 PM
Let me know when you need a design for that. My BTL 18s are doing great in the bandpass.

yours is 2.5 cubes and 8 cubes each correct?

marcotheclepto
01-02-2010, 07:40 PM
yours is 2.5 cubes and 8 cubes each correct?

correct, well twice that for a pair but yeah.

galacticmonkey
01-02-2010, 07:59 PM
After displacement, each is seeing 2.1 cubes sealed, 8.75 ported, 210in^ of port @ 47hz.

marcotheclepto
01-02-2010, 10:58 PM
correct, well twice that for a pair but yeah.

haha i just searched for your build log and went from there :)

Buck
01-04-2010, 01:37 PM
whose build log?