I've owned both amps and the 300.1 is better but again it cost more so it should be. My 450 was only a sig not series II. I had the 300.1 and the Lamm 1.2 ref and I thought the 300.1 was better also. I could not get over how good the midrange was and the 300.1 had amazing bass for a tube amp. But none of these amps had bass like the Levinson 33H.
