the first 2 pics are of my tc 3000 15" sub in a 5 cubic ft dual port 4th order bandpass. the ports are tuned to 58 hz and it has an output of 158db at at 38hz with an input power of 2500 watts.
the next 3 are of my new enclosure which houses 2 jl 13 w7s both of which i rebuilt with 1.6 ohm single copper voice coils. Unfortunately they are less efficiant than the tc sounds at 2500 watts but i think maybe they could handle 4000 watts for some skull crushing lows if i upgrade.
Basically you get the benefit of a ported and sealed enclosure with these types of boxes. Better power handling higher output and overall better response. These are definately worth the 1 week period it takes to construct them.
what do you guys think