Well i heard the Synergy sub 12 in onkyo showroom.It sounded great with lots of thump. but i also auditioned Klipsch sub 10, the 10 shook the whole room in Ezone chennai. the sub 12 should have been better but due to the demo discs played and room dampings the sub 10 sounded better.
Was not able to demo them side by side.But logically if sub 10 is good, sub 12 should be better.
Krish