Unsound,
I will attempt to answer some of your questions if I can,but most of Lyngdorf’s operating technology is in my opinion,proprietary to them and until someone buys their own and pops the top open for a peek,Offcourse most will have no idea what they are looking at.
I try and respect the manufacturers of our components that we buy and I’m only willing to say so much.
The only “spec sheet” is the online manual that’s available to anyone,and direct email’s to their engineering department will get you no answers either.
What I can tell you is that any “Digital” signal that you feed into the 2170,via any of it’s digital inputs is first converted to PWM and then any form of DSP manipulation,volume control,equalization voicings If used,and room perfect correction are applied to the PWM signal before being sent to the amplification portion of the unit.
Now if you feed a “Analog” signal into the 2170,it must first convert into a digital signal via a hardware dac that is 24/96 by chip topology and then is converted to PWM and on down the chain.
Without question to my ears,and using a 2170 for 6 months now,the better that you feed it most definitely the better it will sound.
I can’t really comment at all about your questions related to equalization,whether fixed or parametric,or db range either.I simply have no idea and I don’t use any of the preset voicings that the 2170 offers,I have used Roon’s Parametric equalizer with some speakers with good results,I think the key is to not be very heavy handed with any of them.
I hope I’ve helped you,
Kenny.