Tube amps and low impedances

For what ever it's worth, as I have absolutley no experiences with them, the tubed Walcotts are supposed to be able to handle low impedances. Some respected Audiogoners have praised them.

Another line of stable to low impedance amps is VTL and Manley (PP amps only)

Walcott amps are good for these kinds of loads they work well with electrostatic speakers also

Take a look into the Music Reference RM-200

My Martin Logan Prodigys (Nominal 4 ohms) dip down to 1.2 ohms. Keep in mind, that this is at 20 kHz, there simply is not that much information going on in that part of the spectrum.

My amps, the Audio Research VTM200 have no issues whatsovever driving these speakers off the 4 ohm taps. They will recreate staggering volume with no loss of qulaity in my 12 x 26 x 8 room.

I imagine the REF 600 would not have much trouble driving any real world speaker.