I have checked Adire's site and it says the Tumult can handle 1600Watts, and I think the Impedance with both voice coils in series 3.2Ohms. Currently I have a ported Tumult being driven by 700+ watts, trouble is it has a subsonic filter at 14Hz, although the system is working extremely well, I can get a Crown K1 for a good price, but was a little concerned about powering the Tumult with it as the Crown is rated at 1500Watts bridge mode into 4Ohms, therefore it may produce more into 3.2Ohms. I guess these are probably nominal ratings. I also realise that this would only be a problem at high listening levels which I probably would never listen too, but one just never knows... Therefore does anyone foresee any problems with driving a ported Tumult with a K1?