Something must be wrong with your deck/iphone cause I don't have any static sound when I use a USB cable.I'd go 3.5mm jack to plug to the top of the iPhone. That's what I did, cuz if you use a iPod connection that plugs into the bottom and charges it as well, it gets some static sound. I have an iPhone and it's my main music source, when I have the 3.5mm plugged in and playing music, it sounds fine, when I plug in my charger, it gets some electrical interference noise. There's decks that have USB and 3.5mm built right into the front for under 100 bucks.