2004 trailblazer box

[tonyrms 10+ year member]

I bulit a box that was 6 cubes @ 35hz for a montero sport and I got another car ( the trailblazer ) and put that setup in... Wasn't as loud so I built a bigger box 7 cubes @ 35z still isn't loud I need help because this is really gettin on my nerves

The sub I'm using is an atomic 18" APXX and I running a Brutus 2600 BXI

Could someone plz help me out

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[RAM_Designs 5,000+ posts]

what direction do you have the sub and port firing?