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Do active speakers interest you? Also, let's talk directivity
I like the idea of active speakers with the amplifiers and active crossover not inside the speaker enclosure, it seems like a better idea because you could isolate the vibrations better. A passive crossover can also be used in a line level position. 
Looking for a vinylesk sounding DAC
What's the deal with this live microphone feed, doesn't it still come through speakers or headphones and amplifiers. I think all audio equipment colors the sound. 
Audio Research preamps EXCESSIVE OPERATING COSTS
I don't understand why you can't leave a tube preamp on all the time, I leave mine on all the time, it doesn't seem to need tube replacement very often.  
Constant noisy tubes maybe go solid state?
I would give andy at vintage tube service a call and see what he recommends. He has tubes rated for phono stages that might work better in a high gain setup. 
Seriously? Why Buy ARC Ref 6SE? seems Benchmark LA4 is a better choice.
Odd that there is limited info available about internal design flow of a preamp.  Maybe a diagram showing signal flow.this would be of interest to many. or maybe not.Maybe if you did some research you could figure out the signal flow, or maybe not. 
I DON'T GET IT!!!!!!
I believe the  usb port on the node2 is for diagnosis not for output. Try a coaxial cable. 
Next Best Upgrade for Tidal MQA?
You should take the advice of myself and several other posts about changing from the avr as a preamp and get a dedicated preamp, that will be your biggest hardware upgrade. 
Next Best Upgrade for Tidal MQA?
I have apogee duetta 2 speakers, a krell amp and a bluesound node 2, I used a marantz sr7007 for a preamp and then an adcom preamp both sounded really bad harsh and not detailed. I bought a tube preamp and now I have exactly what you described, th... 
Next Best Upgrade for Tidal MQA?
I agree with the posts that are telling you to get a dedicated preamp, that should be your first priority before anything else is done. 
Poor Fritz
Kenjit if you can complain this much about the speaker industry, I wonder what you think of the recording Industry? 
Poor Fritz
Kenjit I believe these high end speaker manufacturers make speakers for profit and not for practice like you would be doing. 
I really wanted to dislike D'Agostino
You didn't like the sound of krell because you never heard it with the right preamp. I couldn't even listen to my krell amp with solid state preamps, at least the ones in my price range, but with a tube preamp it sounds great. 
Serious Problems with Qobuz
Post no  more then, I already told you that tidal has the same problems of not having something available that was before. The nature of streaming is conflict with licencing. Just canc 
SPDIF cable same as coaxial cable?
No, they are two different formats. The main difference is that I2S contains both data and the clock (separate wires), while with S/Pdif you have to extract clock from the data stream (one wire).  Yes, you can have multiple devices on I2S bus, b... 
SPDIF cable same as coaxial cable?
Does SPDIF just take the I2S format and just change into a single connection instead of 5 connections.