True George, and the lower the tap, the lower the output impedance, a very good thing with the ESL (it's impedance swing is brutal, insane). Interestingly, in my last email with Roger, he recommended I use the 8 ohm tap on the RM-10 with the ESL, not the 4 ohm. I asked about his "light loading", and he said yeah, but the ESL is mostly a 16 ohm load, so the 8 ohm tap IS light loading with that speaker. When I get my Quads up here I'll try both amps (RM-10 Mk.2, RM-200 Mk.2), and all taps.