i have a dbl layer box tuned to 33 hz , previous subs were crossfire 8c7 -12 and peak frequency was 50-55 depending where i position the box . although box peaked higher it seemed to be normal played lows .
now i switched over to sundown 8 sa 12 and my peak went down to 30-31 depending where i position the box , i think this is very odd .
box is 48 w x 36 d x 25 tall double layer 3/4 birch all around, baffle is triple but subs are counter sunk . 4 -8 " aero 22" long . subs up port back . if im doing math correct tune is 33 hz with 13.75 sq in per foot and 14.77 net i only have a 5/8 rod top to bottom so i just did .25 for brace and displacement i figured 1.12
any info would be appreciated .