less bass after carpet

I have built my speaker box a while back and just got around to putting carpet on it now it does not seem to bass as hard is this normal and is there anything i can do to get some of that bass back thanks

btw i am running one DD 2510 powered by DD mb2 amp running about 750 watts rms the box is 1.5 with a 26in port 24in long

It indeed is a DVC but the way it is wired there is pretty much no way for one not to be working and i did not carpet any part inside the box i carpeted up to the edge of port.  Its like the carpet took out some resonast(sp).

wired in parrallel if u do no know DD they run direct wire no connetions they i stripped all wires all 4 speaker wires and both amp wires about an 1 1/2 back and all 3 possitives are twisted together and all 3 neg are twisted together then wrapped several times with electrical tape

no the box is not bolted down at the time and that is in the very near future but i was not bolted down before the carpet

I plan to pull the amp out tomorrow the amp does not have termanals either the speaker wire just comes out of the back of the amp i  am goin to check in side the amp and see if anything is loose where the wire is connected

has anyone esle lost bass or noticed a diff after carpet?

I am still leaning toward an open voice coil or a bad connection on one of the coils.  Can you play one coil at a time to make sure they are both working?

no there is no way to play one at a time the amp is a face mount only the face is assesble everything else is in the box. and i dont think i would hit as hard if i only had one coil hitting it almost seems that before the carpet it would alow the box to transfer more sound and now the carpet is damping it.

i think i might paint the inside of the box with resin to hopefully get more echo out of it if that makes sense.