Help using integrated as power amp

I have a NAD T747 receiver powering some Totem Rainmakers. Problem is that the 747 manual states the receiver should be used to drive 8 ohm or higher. I have an old arcam alpha 9 integrated amp and was thinking of testing out using this as a power amp for the rainmakers and the 747 as the preamp. Can anyone explain how to do this? Do I need to be careful with the volume controls, I am not even sure in this situation which volume controls work.
Thanks.