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i have four alpine type r 12's in two pre-fab boxes all facing up. the boxes are just undersized for the subs and the tuning is off... if i sell off all this and get two RE Audio SXx 12's in a custom ported box tuned @ 33hz. do you think i would be butting out a higher spl? and what about sq...

Re audio SXx 12" 1000W rms 4 ohm dvc so i went on the website for the subs and found the box should be tuned to 33hz which i have no idea how to do (problem 1). the optimal space is 2.0 ft^3 per chamber. is that before or after displacement of the sub? (problem 2) the rough dimensions that i...

Okay I need help. im trien to decide which subs to go with for my next build. Iv really been thinking about going with the AQ HDC3s but i want to be sure before i do. My idea was three Re Audio SX 15s with a 1500 watt rms amp on each one. I know a guy who did it and he was hitting 162 dbs. My...