ive seen them do well in ported box's also.. guy on FLSPL has them in a ported box heres vids..
YouTube - 6 hifonics 12s
YouTube - 6 hifonics 12s on 3000w in a s10
YouTube - 6 hifonics 12s audiopipe3000d s10
same setup ill run but alittle more cubic foot
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sub stage. 4 american bass XD 15's
sub amps. 2 audiopipe APSM1500's
mid's. 16 american bass SQ 6.5's 8 pyle pro super tweets
mid's amps. 2 autotek ATX3000.2 and 1 autotek ATX950.4 on the tweets