Bandpass help needed for a Blowthrough!!!

[galacticmonkey 5,000+ posts]

Heres another blowthrough of the same general idea that I built for 3 BTL 18s in a Ram. Was like 2 cubes sealed per sub and around 20 ported. Super efficient as well. Never metered it, but on a single Crescendo 3k it was doing pretty ****** hairtricks. If youre just trying to make it as loud as possible and do a number, this is the way to go.

 

[SPLluminator 10+ year member]

I just dont like the idea of a slanted baffle. If I was going to go with less subs it would be less 12's and less 12's wouldnt allow me to hit a 149.9 average most likely.

 

[galacticmonkey 5,000+ posts]

I really dont see 4 Type R 12s doing a 149.9 bassrace. You will need to be around a 152 in order to do a 149.9 average consistently.

If you want to do 4 12s, shoot for 1 cube each. Then around 3 cubes ported per sub, and go for 18in^ of port per cubic foot of port. Tune to 45-50hz.