Bandpass box question

[Buck 5,000+ posts]

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.

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[KHARPS 10+ year member]

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 5,000+ posts]

u hit the nail on the head kharps

80

 

[galacticmonkey 5,000+ posts]

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 5,000+ posts]

Now I may be getting a BTL

 

[galacticmonkey 5,000+ posts]

Let me know when you need a design for that. My BTL 18s are doing great in the bandpass.

 

[Buck 5,000+ posts]

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 10+ year member]

yours is 2.5 cubes and 8 cubes each correct?

correct, well twice that for a pair but yeah.

 

[galacticmonkey 5,000+ posts]

After displacement, each is seeing 2.1 cubes sealed, 8.75 ported, 210in^ of port @ 47hz.

 

[marcotheclepto 10+ year member]

correct, well twice that for a pair but yeah.

haha i just searched for your build log and went from there //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Buck 5,000+ posts]

whose build log?