Re: 4th order help
if you want to do a simple 4th that will get loud and low, try 1.25 sealed/ 5 ported per sub. shoot for 250 sq in of port, this way you can shrink it down a little if you need to. Tuning will depend on your preference, but I would not go less than 43hz for a 4th order bandpass.
Refs: diyma-sold to:Mazda3SQ CA.com-traded:matrxx dude CACO- Sold to: Ajax_6154, brandonb1029, TeejayBee traded with: papito FLSPL- Bought from:98chevySPL, JBLCAMRY, traded with:97montecarlo, thumpenranger