I use it for a year.
It is solid, offers good value quality price. the - it's a bit heavy as all the subwoofer.
I try several models but this one that came out of the lot.
This choice I would do without hesitation, I use it with 2 Satellites with 10-inch mark ecler (Ecler Philos 10) and frankly it works great. On the 12 'it takes two because only one I found was too fair and the agreement is much less.
Small correction on the message above, it can not amplify a passive HP