Those Infinity speakers most people probably aren't familiar with. I only heard of them when researching an amp I was interested in that could do 250 wpc. I kept reading about how this amp would go into protect and shut down when paired with Infinity speakers of the same variety.
I'd be careful on the amp you select, those speakers go down to 2 ohms or so apparently. You need an amp that can handle low impedance. The Cambridge 840 V2 indicates on the back that it will accept 4 ohm speakers, but I can't find if it's okay with occasional 2 ohm loads.
I would stay away from Nad unless you check with the manufacturer first. They do have a slightly warm sound, which would be a good match with ribbon tweeters, but I'm not sure their BEE integrated amps would handle ohm drops to 2 ohm.
I'd be careful on the amp you select, those speakers go down to 2 ohms or so apparently. You need an amp that can handle low impedance. The Cambridge 840 V2 indicates on the back that it will accept 4 ohm speakers, but I can't find if it's okay with occasional 2 ohm loads.
I would stay away from Nad unless you check with the manufacturer first. They do have a slightly warm sound, which would be a good match with ribbon tweeters, but I'm not sure their BEE integrated amps would handle ohm drops to 2 ohm.