A note of dissention: I find that the ability to control gain and therefore feedback and damping is an absolute blessing. Admittedly, my RM-9 is driving a pair of hybrid ESL's, but I found that by using the LO gain setting, I could safely light load the speakers on the 2-ohm taps and avoid the numerous fuse blowings that occured on the HI gain setting. Plus, and maybe even more importantly, the LO gain further increased the transparency of the amp and eliminated the tonal imbalance between the cone woofers and the stat panels.
Ralph