What's the best subwoofer? REL? JL AUDIO? Velodyne? Wilson? Something else?

[gian60]

I had Soundlab B1 mono,Yamamura sub,Krell Master Reference and Velodyne 18 DD
But no comparison with this

 

[daytona600]

AV system Triamped L/C/R Horns with 2x18inch Commercial cinema Sub with Quattrocanali DSP+ 4x1250wpc Amp with DSP 10hz @ 100dB ( Limited ) as they can output 20HZ @ 1 m 139 dB SPL
They do offer 30inch Drivers single to quad