I got this friend that has the 1.7's, and I took my Quicksilver Mid's and my ATI over to his house... The Quicksilver will drive it, but the ATI just had more grunt to it when we cranked up the volume while listening to passages that had sax's, bass and piano. Of course placement is critical not to mention not against the wall as that listening window is not that large, but they sure sound nice...Lower volume the mid's did pretty good.. He tried Emotvia XPA-2 which had the power but was to clinical for his taste, he finally went with a used Bryston 4B-ST he got on-line for $1,600.
I'm really thinking of adding a pair of the 1.7 to my 2chl room later in the year... Dire Straits 'Brother In Arms' sounded great through them