With Master-1 as my preamp, I'm using steps 10-15 of 100 on exponential mode.
Quantity of power does not mean everything here though.
This section from Magnepans site says a lot: http://www.magnepan.com/faq#receivers
If you guys think you know what dynamic sounds like, you haven't heard it until you've heard it with a high end speaker amp. Probably only the Master-10 or Master-3 are able to do that from their line.