Originally Posted by Curious Cat
Like always all my technical problems can be solved by throwing more money at it.
My old receiver handles 4 ohms fine but it has just basic surround sound features, no Dolby anything.)
Why not just send pre-out signal from your new receiver to your old receiver. You will then only be using the amplifier section of the old receiver to power the KEFs. I did that (nice preamp to old receiver) when my amp was in the shop.
Just set the "old" receiver to "stereo" or "bypass" mode. Then, when you calibrate your speakers, you will set the volume knob to some level on the "old" receiver, and you shouldn't need to touch it after that.
You can upgrade to a bigger/better amp later, but this will get you by nicely for now.
This, of course, assumes that your new receiver has pre-outs (probably does) and that you want to keep it -- you mentioned that it was brand new, so perhaps you could return it for something that suits your needs better.