That's a tough one. I assume that the Shiva is powered already and you want some type of integrated amp that also has a xover built in? Why don't you try something like the Griffin that everyone is raving out for a hundred bucks? It doesn't have a xover, but the price is right, and you can probably hook up a y-splitter from the microphone out to send a signal to your Shiva...
Sunny.
