I looked for a subwoofer to complete NS10 (from the same brand), not having the budget to invest in the models above.
Listens home studio, to project characters unpretentious but serious nonetheless.
The NS10 is amplified by an amplifier Yamaha Hifi, part of which preamp is bypassed, for more gain and dynamic as possible.

SOUNDS

The sound seems pretty clear, precise and defined, and seems to me to fulfill its role of Sub. The fact that it really helps to refine configurable setting with two other speakers.
I think I found for myself a good compromise setting, but I am confident that with someone more qualified than I, the result could be optimized.

OVERALL OPINION

Used for 6 months after a test with the model in Prodipe, there is no photo. The HS10W is much more accurate (I think you it) as its competitor.
Made some mix up, with better results on real balance (at least, it suits me), bass notament.
The problem is that once you have tasted, it's hard to go back!
I certainly do it again this election, unless any spare, to save and buy Dynaudio!