@earlflynn Look at the M40.1's impedance.
https://www.stereophile.com/content/harbeth-m401-loudspeaker-measurements
It may be specc'd at 86dB, but the impedance averaged over the whole frequency range is actually well over 8 ohms.
https://www.stereophile.com/content/harbeth-m401-loudspeaker-measurements
It may be specc'd at 86dB, but the impedance averaged over the whole frequency range is actually well over 8 ohms.