Didn't really see a consolidated thread on this particular topic so.. What do you think - major difference? Does the B2000 and its switching power lose something the toroidal transformer in the B1500 gives you? In my opinion, there is a subtle lack of depth or true low end in the B2000 that is not lacking in the B1500. Reminds me of when I matched my Kern pre with the CA9 and a PLX1800. Major difference in depth and oomph. The B2000 with a swapped out EHX tube really adds the grit that you can't dial in with the B1500. The drive knob on the B1500 seems to give you more variety than the B2000. I'm keeping both for now. The B1500 is so legendary. The B2000 is sort of an unproven animal at this point.