The Pioneer DEH-P6900UB receiver gives you a seemingly unlimited amount of options when connecting to external devices. Pioneer’s “uBus” USB direct control system allows you to plug in a large variety of USB devices, including that shiny new iPod, and control them without using any auxiliary inputs or adapters. The DEH-P6900UB also plays MP3, WMA, and AAC files off discs and features a rear input for satellite radio or a CD changer. Also, a Bluetooth adapter gives you the option to make convenient hands-free calls through your sound system.