TV audio into DAC via eARC or better

My HDMI extends from my Apple TV 4K to a Nad m17 processor, and then I have RCA interconnects from the processor to a Conrad Johnson gat2 preamplifier which is connected to amplifiers.

Of course everything flowing through Xfinity is subpar. But all the streaming stuff going through Apple TV for nonstereo listening is hard to improve on given inherent streaming Quality deficiency.

the power cords, HDMI cables, Ethernet cords and network switch are all upgraded.

What more can be done here? Sound is quite good on my system but unfortunately it's entirely dependent on the quality of the source. And streaming Quality is inconsistent and always compressed. 

If the Apple TV 4K and Nad M17 both have eARC, streaming should not be compressed.  You need to assure both have eARC.  After the processor it's analog.   Of course audio quality is dependent on the source, be it vinyl, disc, or streamed.

@lalitk No need for Atmos.  Toslink is pretty old technology I assume ARC and eARC can send even 2 channel stereo pcm at a higher bit rate to the dac.  

eARC has a bandwidth of 37Mbps where toslink is only 384kbps

https://www.avaccess.com/blogs/guides/difference-between-hdmi-arc-and-earc/

I believe all streaming services including Netflix involve compressed audio.  It’s my understanding that the full advantage of EARC cannot be obtained via streaming.

As others have said, I use optical out from my Sony oled to my Benchmark DAC1 for my 2 channel bedroom/tv system and am amazed by the sound.

BTW, Netflix allows you to change the sound from 5.1 to 2 channel so the digital output from the Sony tv is not doing the 2 channel downmix and the sound is indeed improved.

@chauncey

If you’re not after Dolby Atmos then Arc or optical connection is more than adequate from your TV to your DAC. Those who post here with an assumption that streaming offers compressed video and audio, either don’t have the adequate bandwidth or lacks the proper hardware.