I'll tell you a little more. First, the speakers worked fine with the unit I removed. The vehicle is a bus. It is set up as left and right channel. There are 4-45w/4 ohm speakers per channel. A friend is thinking that its probably pulling 1 ohm, which isnt good. Later today I will check to see what the ohms are, just to be sure. I would "think" that if a 1995 radio could handle it, a 2010 radio could handle it. These are factory 5.25" speakers.