I am trying to hook up sirrius radio to my HDS unit. What kind of speakers does it take and how do they hook up. Can't find anything on this subject. Any help would be great.

I bought some of the small iPod speakers. Plug them directly into the black box audio output and I used velcro to stick them to the dash. Also bought a USB charger plug to plug into 12 v outlet to charge the speakers. Works great!