I have owned both pieces, but not at the same time. I felt like the LS3 was a bit thin sounding. Its synergy with the McCormack will depend mainly on your choice of speakers. I felt compelled to move on to a different preamp. After many combinations, I keep returning to a tubed preamp and a full-bodied power amp combination.
I currently run a pair of mono-ed, balanced, Rev A .5's, which are wonderful sounding amps, and an Audio Research LS16 with ProAc Response 3.5's.
I currently run a pair of mono-ed, balanced, Rev A .5's, which are wonderful sounding amps, and an Audio Research LS16 with ProAc Response 3.5's.