Thanks for the question! As long as you do not cover the speakers or block the sound coming from them, the sound quality will not degrade drastically if you mount the TV in a cabinet.

-MrSamsung

Actually the speakers on the LN40B530 are down firing speakers. These speakers allow for a sleek outer design while preserving audio quality. They are also 10wx2 powered, though I do not have info on the size.

-MrSamsung

As a matter of fact, there is! The B530 offers these buttons on the right side of the bezel, along the outer perimeter closer to the bottom of the unit.

-MrSamsung

Although the B530 does offer a USB connection for easy firmware updates and for service uses, the unit does not offer a USB connection for media playback.

-MrSamsung