I'm going to be adding an XM receiver to my empeg install. Right now, my amp is hooked up to the amp remote line, but it gets its power from another circuit, and just uses the amp remote line to switch on/off. The XM receiver I'm adding draws 500 mA max, so I thought I could just connect it to the amp remote line and ground that are going into my empeg wiring harness. Is that the best way to go for a small device like this?