I don't know if you can do this with vtl but I own bat and instead of biamping for me I can get two more bat amps and double my power turning my 600 watt mono blocks into 1200 watt mono blocks. As I understand it not all amps can do this, depends on there circuitry but that is one thing I like about bat. The path don't end with that purchase, it can easily be expanded. I've done biamping before and it is ok and can help but it can also cause timing issues. It is recommended to do it with identical amps. Also depends on what speakers you have as to if they would even benefit from a biamp. You would get much better results from double the current than biamp.
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