Having learned, with some math tutelage from Armaegis, that the resistor network built by Jan Plummer for my TBI Millenia MG3 reduces the power output by 15.8 dB (from 5.1W into 50 Ohms to 133mW into 50 Ohms), I no longer use the attenuated, Class BD MG3 with my LCD-2, due to the loss of dynamics and bass control had with only 133mW. Of course, the real reason for using a resistor network with the MG3 is to silence the hiss inherent to its excessive gain - a hiss that can be easily heard with transducers that are far more sensitive than the typical 8-Ohm loudspeakers for which it was designed.
But, as FlySweep later convinced me, that MG3 + 10/2 resistor network sounds freaking awesome with the HD600 that I purchased at his recommendation. He has since gone on to say that his more recently acquired HD650 are even better with the MG3 + resistor network. The good news is that the story ends well, after silencing the MG3's hiss, by using headphones that don't need more than 133mW into 50 Ohms (or 23.4mW into 300 Ohms). I'm also blown away by how wonderful the attenuated MG3 sounds with my HD800 (at least with recordings that don't have a lot of bass - a weakness of the HD800 that the relatively neutral MG3 can't compensate). Overall, the HD600 is a much better match to the MG3 + resistor network (as is, the HD650, per FlySweep, who started out with the HD800 on his attenuated MG3).
So why should anyone buy an over-powered speaker amp for use with headphones - especially if you have to attenuate the output? Because the amp itself might bring something to the table that you're not able to get from any other amp you've heard.
Seriously, it's surely not the 110W into 8 Ohms that Gary is exploiting when he listens to his Odyssey Audio Cyclops Extreme - fed directly into his LCD-3. He's using a tiny fraction of that power. No... He must just be attracted to those same qualities that make the amp so popular with HiFi enthusiasts - the amp's sound!
Edited by zilch0md - 1/25/14 at 9:08am