I've had a single hds210 for a few months now, and if I had to do it again I'd choose differently. It's pretty loud, but the sound quality just isn't there. It's not very flat at all and rolls off hard at about 60hz (most people in the market for a budget sub don't have an incredibly strong front stage), and it loses control/authority pretty easily on combinations of bass lines/kick drums. That being said, if you mainly listen to hip hop/electronic music then you'll love them!