Quote from Stereophile
“However, the M40.1’s plot of impedance magnitude and phase angle (fig.1) suggests that the Harbeth is easy to drive in terms of its demand for current. The impedance drops below 6 ohms only in the middle of the midrange, and then only for a short while; and while the electrical phase angle occasionally reaches extreme values, this is only when the impedance magnitude is high, ameliorating the drive difficulty.
Read more at https://www.stereophile.com/content/harbeth-m401-loudspeaker-measurements#KmIWZ4ssO4CXlipk.99”
I point this out as the Lyngdorf 2170 has more than enough current to drive this speaker with ease in an average room. 30 amps of output current. The 3400 would also be a good match, but the 2170 at several thousand less is also up to the job. What’s more the 2170 plays this speaker in a way that makes it come alive at low to moderate volume levels. That is a wonderful reality also making it a great match with the 40.1.