Judging audio product by specs is not an easy task.
For example:
19 Hz to 140 Hz is very likely much worse than 22-100Hz +/- 1dB
Oh yea, SVS easily walks over the velodyne.
If I'd to find closest completion to pb1000 is this one :
VTF-2 MK4 Subwoofer
It's a bit more versatile for usage and placement, but I still bet SVS has more raw power
and this one:
Outlaw Audio LFM-1 Plus Powered Subwoofer