The Pioneer is something like 110w per channel, right? Which model are they? Most CVs are pretty efficient, usually around 100db or more depending on the model. I'm thinking they should be loud enough to cause hearing damage. How much more do you want?
If the receiver has pre amp outs on the back, you could always go buy a used 200w per channel pro amp for a couple hundred bucks and see if you can break your windows.