As much as I love my K3, I'll admit that the K2 sounded better. The difference wasn't big and I may be off-base, having not done a direct A/B comparison, but I think the K2, with its simpler RX architecture, has a smoother sound than the K3. Not enough for me to stay with the K2, but enough that it can be noticed. - Keith N1AS - - K3 711 -