Just noticed this on the description... Compatible with Asus TF201 tablets; provides a keyboard and stand; built-in battery; 40-pin connector port, 2 USB 2.0 ports, Secure Digital card reader and subwoofer input ..
Subwoofer input ? Not even sure what they mean by that.
I have read several posts of people inquiring about a subwoofer in the dock. Personally I do not think there is one because there is just not enough room to put a speaker in there capable of a frequency range intended for a "SUB"woofer. Perhaps some fancy internal porting like the Wave system by Bose to get some low. Personally I do not think it has any audio features in it.