The ESL-63 is nominally 8 Ohms, the actual impedance varies from 3.5 Ohms at 10KHz, to over 20 Ohms below 100Hz (this is level-dependent). [Service Manual, page 8].Does anyone have actual experience of successfully driving a set of Thiel 2.4 speakers (impedance 4ohm - 3ohm) with a Quad 405-2 power amp?
I note that the 405-2 typically doesn't like low impedance speakers, but electrostatics are 4ohm and they seem to work ok?
The problem isn't so much distortion as clipping - trying to draw more power than the 405 can supply.Thanks for the reply - Despite being a lay person in the electronics area, I think that I am getting it now - the issue is not the impedance per se, but more the fact that as you try and drive them hard, the amplifier runs out of puff at higher volume levels and then distorts?
= at lowish (non-party) volume levels = no problems.