Well, more like sound quality through performance. After months of listening to internal external amperage w/ the 4700H / 6700H. I've come to an acoustical conclusion that over driving the pre-amp into post internal amps lacks a bit in performance clarity vs Emotiva external output amp. I've configured my sound system to perform off the charts, not just in power but fidelity and performance. All you need is a clean low volt pre-amp signal ( Lets say 1.1v not 1.4v -1.6v clip) and than you throw a Super Charged amp. Fully, and Independently - powered, cool running, high amp'd channels. Emotiva sitting waiting for a signal to drive it out of the park. I've heard the 6700H strain a bit at mid to peak DB's. What might be happening, pre-amp at some point, certain power points, peaks, distorts the output signal - @ the post amp stage output. The Emotiva yawns throughout the power curve, cleanly and firmly. Throughout the full frequency spectrum. I believe the point is not to over drive the pre-amp signal to attain a higher op-amp output. Have the external amp do the heavy lifting. Keeping the pre amp stage at bay. No other way I could explain it. I'm certain someone other then myself has a better, more technical explanation.
Another external amp example. Flash back, growing up, my father had an old chevy w/ AC Delco am/ fm radio. Sound was horrible. When I was able to drive, I added two sets of higher end speakers and I externally wired in a Radio Shack 80w car amp / equalizer combo. The AC Delco radio was now a shining star, pumping out great sound! Now imagine, I very clean AVR pre-amp signal through a high output amp? As I said before, beyond incredible sound. Past few months during COVID, I have enjoyed / along with my neighbors

(no complaints yet) the pure direct acoustics of it all. And action Movies / surround sound send you jumping out of your couch

No power processor shell games (as I call it) where the Denon processor tries to figure out where to divide 140 watts of power to the channels in need. The Emotiva has full power sitting, waiting on each channel, always. No processor shell games here. End result, amazing!