Ah... here you can see one of the 2 speakers, which are right below the player stations. There is also a sub-woofer inside the center column of the table. Also, the thickness of the table can be seen here. (1 inch thick...)

The table rocks. Without the subwoofer it would have been so-so... but with it, it's great! Volume is controlled via the mp3 player interface, since they're computer speakers. (I use iTunes, and have also run the table with an iPod and no computer.) Dio and Dokken are expressly forbidden.