My amp is a JL e4300 series. It says "MOSFET Power Supply" in the manual, but I can't find anything that specifically mentions the remote line's draw. I guess I'll dig out my multimeter tonight and test it out. If it's just a few milliamps, I should be fine, since the XM unit says "max 500 mA", and evidence on the internet suggests it's generally around 200 mA.