Hi Ian-- If it were me, I would just wire your Shiva voice coils in parallel, and run it with one channel of your 770. IMHO, the Shiva doesn't really need much, or any more than 200 watts to work really well. If you haven't seen this, you can read what Adire has to say about wiring up their dual voice coil Shiva driver. Of course I realize that sub type, enclosure size, method of construction, vents, or no, etc. all come into play in determining how much power is needed to achieve the best results. By the way, I have two Shivas in sealed enclosures which I drive with an Adcom 555 II. I like 'em! Best wishes...

[This message has been edited by steves (edited May 07, 2003).]