Considering the New Tekton Design Encores? AND Owners Group - Experiences/Questions

the Yamaha AVR, even in pure direct mode, appears to be adding some noise to the sound

What I been sayin’. The only way of doing HT at Encore level is to run stereo, plugging HDMI video directly into your monitor.

Those are some fine speakers. I know, because my Moab are awesome and Encore have to be at least that good. So even more awesome.

My suggestion would be to ditch separates, and all the extra multi-channel stuff, in favor of a Raven Osprey. Then not only your son but your wife too will be joining you and you can all sit there slack-jawed in awe of how good those Encores sound with some quality tube watts running through them.    https://www.ravenaudio.com/product/osprey-mk3/

I previously had Martin Logan Montis Electrostats in my system and I wanted more dynamics. I was worried I might have to sacrifice a little speed and resolution but I now realize that was completely unfounded. I feel the Encores are just as fast and even more resolving, particularly in the midrange and treble. They throw a wider and significantly deeper soundstage in my room.

Not surprised. Knew before ordering my Moabs that they are as fast as a stat. Knew it because you are not the first ML owner to say it. 

I think the very high resolution of these speakers exposes the upstream components and recording quality of the music being played to a great extent

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This is one of the best things about them. There's a common question along the lines of what do you like to play to show them off? Well, when everything sounds so good how are you to decide? I mean, resolving upstream changes, I put rubber bands under power cords and heard it. How much more resolving can you get? ???!

I feel in the midrange and treble region, they can play with the uber speakers.

I feel that in the midrange and treble region some of the uber speakers can play with the Tektons. Some of them. If instead of just the one you order all Be tweeters, then probably you are untouchable. 

Congrats! You will love them. Can't wait for your review. 

It's a 10 to 1 ratio with wattage anyway. It takes 1000w to effectively double the output of 100w amplifier in spl. So even with 50w you need 500w just to double the perceived spl. At least that's how it's been explained to me. Please correct me if I am wrong.

Power to volume is logarithmic, but not quite that much. Doubling the power is only 3dB louder. Double three times- 3, 6, 9dB- you're talking 8 times the power to go 9dB louder. The ten to one you're thinking of is probably 10dB takes ten times the power. That one is true. 

Another factor is "double the perceived spl" that one is pretty subjective. 3dB is only a little louder, but a lot of people would probably agree 10dB is twice as loud. So that may also be where your 10 to 1 comes from.
Either way, based on what I am hearing from my Moabs its a slam dunk that Encores are super easy to drive and sound amazing.