Re: how to make a LOUD sealed box
4th order BP's need a sub with an EBP as low as possible and the lower the better to perform with a wide response, If youre looking for a louder box and dont care much for it's +/-3dB response, the 4th order BP is much louder than a sealed box because of the gain it can produce. The flat response BP for the L7 would be a sealed rear chamber of 1.7cu ft net, and the front (ported) chamber would be .82 cu ft net. Tuning needs to be 48Hz and the bandwidth would be 30Hz - 80Hz +/-3dB anechoic. 1.75-1.8 is optimum sealed, Qtc of .7 has a F3 of 48Hz and a 10dB down of 28Hz. Its optimum enclosure would be 3.5 cubic feet ported @ 27.4Hz. Power handling would suffer but it would have a usable bandwidth of 24.5Hz - 80Hz almost perfectly flat. Heres the plots for ya.
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