Ok ive been wanting more output out of my sub setup. both in loudness and frequency respose. i have an mtx 500d runing 2ohm to a pair of jl audio 12w3 according mtx the amps puts out 690 watts rms. ive asked around to see if i could run a bigger amp but most people say 300 watts is sufficient for w3. right now they are in a sealed enclose w/ 1.25 ft63 each. according to jls web site their reccomendation for max db system consists of a 1.5 ft^3 enclosure ported with a 4" dia by 16' port. there "purist" enclosure consitsts of a 1.5 ft^3 sealed encloseure. im considering building the ported box and making a cap to seal the port if desired. This will yeild a 1.6 ft^3 sealed enclosure. this gives a slightly higher output at low frequency with less than 1/2 db loss overall. id like any imput regarding reccomendations for new components (id like to only replace the subs/box or the amp) also any imput on the dual purpose enclosure. or suggestions on something different(i listen to all types of music) thanks for reading.