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Its not the box or the L7s . Its a power problem. You are probably not really seeing 400 watts with those amps at 1 ohm. try reversing the polarity on the subs also. Lots of times when FF subs you will need to wire both subs out of phase. ALso make sure you dont have a phase probloem. Try the l7 subs one at time and see if you get any difference. I have used l7s in a FF enclosure here and we ran 1200 watts rms on them and they pounded. Shook your insides in the exact same enclosure you have