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The Velo HGS (as you are probably aware) has a servo circuit that limits output in order to keep THD extremely low (I think around 2% for the Gen II HGS circuit IIRC).
Limiting THD to 2% at any/all frequencies is certainly laudable, but also very conservative, and as such the HGS-15 II might not play as loud as you might expect for a 15", 1250 watt subwoofer.
The SVS has no servo circuit, and instead relies on a much larger enclosure volume, venting, and dual high quality drivers to keep THD low while still providing significantly more output capability than the HGS-15.
With the PB2+ in the stock 25 Hz tune, the HGS-15 will have deeper extension. But in the 20 Hz tune, the PB2+ will have comparable extension and still retain a large advantage in output at all frequencies above 15-16 Hz.
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