Hi Jkohn and Bonjour Randyman, Bienvenu!

(After 7 years of French in Canadian schools, I have to use it now and then to keep from getting rusty). You are right, Jkohn about the tone controls. It depends at what frequency the "hinge" of the treble control begins. The Rotel's hinge is much higher than usual, not uncommon in "audiophile" tone-control circuits. Most treble controls on mainstream receivers begin acting in the midrange, around 3 kHz.

And yes, Randyman, permanently installing resistors is a trade-off. For example, the sound of brushed cymbals was a bit muted on the M80ti's (with resistors) compared to the M22ti's without them when I A/B'd them. I also compared one M80ti in mono with the resistors to the other without. Same result. The resistor will uniformly reduce tweeter output across the spectrum that the tweeter covers. In the M60 and M80, that would begin approximately at the crossover frequency at 3,500 Hz.

Regards,


Alan Lofft,
Axiom Resident Expert (Retired)