Greetings,
I have some 12 cubit ft. (internal volume) 1" MDF sub woofer boxes, made for 18's. I also found a pair of empty old Altec 612 cabinets.
I have a pair of used GPA 604 type speakers, and plans (schematics) for a XO both from GPA and Jeff Markwart, both have 2 L-pads and are similar,
but JM's claims to correct phase. ? Any preference or suggestions? Questions: Is the stock port size on the 612's "ideal" for a 604, or is it advised to tune it somehow? Can I use the 12' box's for a 604? If yes, how would I tune it, or what math or port size is applied? Any advantage to this? Can I get "better" or lower extension in the bass? Could I use an 18" and the 604 together in the same box? Biamped or ? Or is the 612 "almost as good as it gets" ?
Any advise appreciated.