ear2ear Posted September 9, 2012 Report Share Posted September 9, 2012 It doesn't matter how many subs are in a chamber, 1, 2, 3, whatever - each one needs it own 2.5 cu ft. '09 Sierra Ext Cab - under construction (1) RF T2500-1 -running- (4) RF T1 12's (1) RF T1000-4 -running- (2) RF T1652-S Stock alt / battery -plus- (1) DC Power 230a & (2) Kinetik 1800 Buncha OFC Knu Buncha Second Skin Kenwood DDX814 - Alpine Imprint - RF 360.3 Link to comment Share on other sites More sharing options...
Guest Posted September 9, 2012 Report Share Posted September 9, 2012 2.5 times 2 = 5. add 1.5 cubes for port/bracing/sub displacement. you need about 6.5 cubes to make 2 15's comfortable. Link to comment Share on other sites More sharing options...
bkolfo4 Posted September 9, 2012 Report Share Posted September 9, 2012 You could consider (3) 4" aero ports the full 17" long in that box. Not perfect, but may be your best option if you insist on 15's. Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
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