A:
10 watts. But understand this isn't a Sharp TV. The quality of the panel is inferior to a Sharp Aquos in every way, including the quality of the sound. BB licensed the Sharp brand and put it on some OEM's worse product.
BB lists another, newer, panel that claims to be a Sharp product. We'll see.
If you need *loud* you should be sending the sound out to an external amplifier/speaker anyway.