An iPod or iMac camera connection kit will give you a USB connection. Then use a USB-->SDIF converter.

Drobo-->FW 800-->mac mini-->Ethernet
Transporter--> Wireworld Eclipse 6 coax-->Meridian G61
G61--> Nordost Red Dawn-->Primare 30.3
Primare-->Ocos--Vienna Acoustics Beethoven/Maestro