Adam Audio T10S Subwoofer

It's a relatively compact subwoofer with an excellent sound quality if you do not play it very loud.
The appearance and build quality are fine. The box does not give an impression of a very heavily built professional product. But it's good enough to do the job. I didn't find any shortcomings in build quality. The resonances of the box that you can hear while knocking it do not show up during operation in any way. I was specially pleased with the rubber feet that isolate the box from the floor.
Loud playback with long speaker cone excursion is out of the capabilities of this product. Distortion start to show up gradually when you play back a very loud signal and on low frequencies (40 Hz and below). You should not expect to feel the punch with your body and the whole room vibrating. It won't play that loud.
Additionally it can't go really lower than 30 Hz. It rolls off rapidly below that. It's just a 10" driver. But above 30Hz it has a very pleasing flat amplitude response with low distortion.
When used on moderate volume T10S shines! The sound quality is excellent!