Considering the size of the system's subwoofer, it should come as no surprise that the Concept D 500 USB speakers pack a mean punch. To an extent you can think of them as a pricy set of Sony SRS-DB500s - if you’re looking for a set of speakers to annoy the neighbours with a rumbling low end boom, these will definitely satisfy. Crank up the bass control and the low end surges through and past overwhelming and into ridiculous, completely destroying the overall tone.
With a little restraint applied, however, what the Concept D 500s offer is a warm, and enveloping bass response that's forceful but also very detailed. With movies this means a real sense of atmosphere is created by brass and woodwind sections in orchestral soundtracks, and that bursts of gunfire or explosions have almost as much force as if you were actually in the midst of the action. Games, too prove an entertaining affair for the same reason.
The Concept D 500s aren't just about power, though, the satellites handle the mid and high end spectrums with as much aplomb as the sub woofer belts out the bass. With a good source - think high-end DAC and AMP, not 3.5mm to coax converter - the concept Ds make excellent hi-fi speakers; just remember not to go overboard with the bass control.
We'd be lying if we said that the step-up in quality offered by the Teufel Concept D 500 THX speakers from a less expensive stet such as the Creative T3 speakers is proportional to the step up in price, but if you're able to spend the kind of money Teufel is asking for the Concept Ds on a set of PC speakers you probably won't care about that. Such a person need only ensure they can accommodate the Concept D 500s' sizeable presence.