I finally got to auditioned the McIntosh MAC6700 2-channel stereo receiver on the weekend.
The source was the McIntosh MCD550 CD player, a Rega RP10 turntable (my current model) and for speakers, I listened to both the ProAc Response D30R floorstanding speakers (my current model) and the Sonus Faber Olympica II floorstanding speakers. Bass went a little deeper with the ProAc but the Sonus Faber seemed a little more refined (very slightly). I did not find one speaker "better" than the other, just different.
As for the McIntosh MAC6700 stereo receiver, I was really impressed. I currently own a Devialet 200 integrated amp and in terms of sound, the McIntosh was very close to the Devialet. The only advantage the Devialet has over the McIntosh, is that it's upgradeable (future-proof) via firmware & software updates. For example, when I first got my Devialet, it did not support DSD playback (Firmware 7) but with Firmware 8, it now does. Also, with Firmware 8, they introduced more settings for its built-in phono stage in order to support a larger amount of cartridges. I took a look at the MAC6700 manual and there's no mention of DSD support. Therefore, I would have to assume that if I wanted DSD support, I would need to get an external DAC, even though the receiver has a built-in DAC.
Having said that, I've always liked the look of the McIntosh gear and I have no complaints about it's sound with either speakers. Plus, the McIntosh gear is built solid as a tank and seems to keep its resale value.
Well done McIntosh!