8cf, 3400 watts, what would you do?

Great. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif Looks like half of the pain of this project is going to be finding a sub I can actually buy and whose maker will actually return phone calls/emails.
lol look for them used.. probably will be a little cheaper too

 
Having a hell of a time trying to get predicted port velocity to an acceptable level here, with two 15s at 3400w in a vented box around this size (20x24x45 is the DROP DEAD MAX external box size I can fit, 10.5cf gross). Do I absolutely have to keep port velocity under 20m/s or is higher OK in a high-powered car subwoofer setup? I don't want port chuffing. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 
What kind of car and where is the box going to be placed?
Mid-size sedan, back seats, subs facing up.

I've placed an order for two Fi BTL 15"s, I finally came up with a box design I think will work, 7.5cf net, 11cf gross, tuned to 31-32 hz. Torres' speaker box calculator is great. Realistically I think I will only be putting 3200w to these, by my calculations that should keep port airspeed to a reasonable level. I think I'm going to get a Sundown 3500d for the amp.

 
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