I have KEF Reference 105/3's for mains (same as 4's but with 8 inch woofers instead of 10 inch woofers), KEF 200C center channel, and Velodyne HGS-12 sub. The KEF's, IMHO, are good for 2-channel listening ........ great imaging and soundstage. You do have to watch the bass, there can be quite a bit of it and you have to get them away from the walls ........ but when you do they sound good ....... you have a large enough room so this shouldn't be a problem. The HGS-12 has been a great sub .... very tight and clean sound. My room is smaller than yours, but from what I've heard and read, the HGS-15 should do the trick for you ..... and I think better than the M&K will do (IMHO). I've heard it takes a bit more power to run the newer KEF Reference speakers than my older ones. I can tell you that the better the equipment, the better you'll like your KEF's. I started out with an Acurus A-250 and have moved up to a Llano 300S (300 wpc class A amp) and there is quite a difference. My guess is that the Acurus would've been better power than your Marantz receiver .... so you can read into that. I'd go separates ........ I had a receiver and went to separates and noticed a lot of difference. If you get a good high-powered amp, you shouldn't have to bi-amp ........ but one always can depending on how far you want to go with things. Good Luck.
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