I had Kef Reference 2's they sounded superb with both Primare 30.1 and Quad 606II/66 combo. I also tried Perreaux with it, although the bass was the best with this in chain but the mids were nowhere near what Quad had to offer. I am sure the 909 would sould better than 606II, it has been very highly rated.
Reference 4 needs a bit of power so biamping with two 909 may work very well. The mids of 909 were compared to the Mark Levinson in one of the reviews I read. Do a search on google and you will come up with the review.
Good Luck
Reference 4 needs a bit of power so biamping with two 909 may work very well. The mids of 909 were compared to the Mark Levinson in one of the reviews I read. Do a search on google and you will come up with the review.
Good Luck