How do you use the USB? and how does the Airport express fit into the system? EDIT: How is the Airport Express used with the system? Really like the set up, and the paint job looks great
The USB is just for charging! It is a Griffin 2.1A iPad Charger for a car - connected to the 12v supply for the amplifier. The Airport Express has an Audio Out 3.5mm jack which is connect to the amplifier with 3.5mm to RCA cable. Both the 12v DC Adaptor and the AE are 240v which is why I went for a 240v cable out the back.
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I LOVE this design!