Fi BTL SPL Port Size

[quic1 0]

Is 324sq in per sub too large for a striclty SPL enclsure using 4 Fi BTL 18's in a 32cu ft. box

[quic1 0]

I am so glad I found these subs, they remind me of the Rockford TRF subs

[shizzzon 461]

You need 500-750sqin of port area for SPL total

[Kanaworm$ 292]

16 square inches per cubic feet would give you 128 square inches per woofer x 4 woofers = 512 square inches of port.