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How many cubes for 4th or 6th?


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I'm about to put a new cab on my truck, and was going to add a 4th ab tnt 15, but they aren't available ( I have 3 of the newer model ones that have 1500rms rating) . My box is currently 12 cft gross , I easily have another 8-10 cubes available (b-pillar wall) , how much room do I need to run a 4th or 6th with either 2 or all 3 of my 15s? I'm waaay over powered but can adjust gain down I guess, I just don't have funds at the moment to change up subs, so box would need to be a bit generic so I could upgrade subs a bit down the road to use all the power I have (md8k @2ohms). 

2009 Silverado 1500, 7.5" lift, 37x12.50r17s, Built Gen 4 5.3L ( 4.8l flat pistons, decked 243s, SS2 Cam, Pac 1218 springs, ported intake, 120mm TB, Long tubes, 3" duals HP tuner software tuned by me), 4l80e swapped and 4.56 gears. All done by me. stereo is Pioneer avh 600ex, all stinger rca, jp23 v1.5, skar rp150.4, and hertz hpd4. 2 SHCA 6.5 8ohm, 1 SHCA 3.5", and 1 DS18 tw120pro in each door. The 3.5 mid and 3.5" tweeters are powered by the skar rp150.4, the 6.5s are powered by the hertz bridged @4 ohms. Dual runs   of 3/0 welding cable, 300a alternator, 2 Vmax AGMs up front. current sub is a AB XR 12 ( dual 2 ohm) with bottom spider cut out in 2.25 cubes at 32hz

 

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