I've bought their bluetooth unit so they make good stuff. I've not seen that must be new, if it works with a regular aftermarket amp I'd get one. Ask them if there is a minimum sensitivity the amp must have in order for it to work. I just have a regular Kenwood amp I got from Crutchfield with both line level and powered inputs, but the line levels aren't sensitive enough to work without the Becker amp so I'm stuck in the middle.