mine for a 12 was 1.5 cu ft. rear (with displacement 1.65 cu ft)
2.0 cu ft front (2.05 cu ft with port displacement)
Tuned at 47.65 hz
ports: (1) 4" port 4 3/8" long Vent mach is 0.10
So your rear chamber is either too small or the ported chamber is too big
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2011 USACI Trunk 1001+ World Champion
Originally Posted by MasterMod
I guess I should mention that being an admin means that I can circumvent and/or ignore whatever rules I want.