Thank you for the thoughtful reply.
Implied is that running Spotify through any AVR should be equal to a dedicated streamer input to any AVR. Correct?
Those same people ignore that Spotify streams at a lesser quality than Qobuz. Correct?
There are ways the signal can differ in the first place streaming Spotify on an AVR vs. from a dedicated streamer, maybe different quality settings etc.
And from there, it's conceivable that the internal path from the streaming module to the analog outs could be audibly different vs. one of the digital inputs on the AVR, although I wouldn't expect that.
But if we're talking about using a digital input to the AVR, vs. using the internal digital source on the AVR, and we can say for sure the digital stream is the same, any real difference in sound quality would only indicate something is wrong. Which is possible, AVRs have been shown to act funny with signal quality sometimes.
Bits are bits, whether they come from a $10K streamer or a $100 one. That's the beauty of digital, nothing can really affect the sound quality (as long as the bits remain intact) until you convert it to analog.
I probably sound like I'm being a bit ideological here, but I'm really just standing strong on the concept of digital signals. Think about it like this... rip a CD, play a CD over SPDIF, or stream the same CD on a lossless service, or download a CD-quality file of the same album. Assuming no errors in the CD playback or rip, these files will be literally identical, bit for bit. The quality of the hardware, as long as it can successfully output CD-quality audio (not a high bar) matters zero. The DAC and everything after that does matter.
But as long as it stays digital, the concept of sound quality doesn't even actually exist, we're talking about a long list of numbers here. It doesn't sound like anything and you can't affect the tonality or anything any more than you could by loading it into Excel and scrolling.
Lossy streams
can definitely sound different than lossless ones, ironically this is especially true in cases of hearing loss at specific frequencies, because the masking effect stops working properly in that case. So I'm not arguing Spotify vs. Qobuz definitely sounds the same. There's also always the question of what master they're using when you compare two different streaming services, it's just hard to be sure something that ought to be identical actually is.
The sound difference hasn't been insignificant. So to those who continue to challenge this, I'd like to know who is streaming directly through an avr, and not taking some ideological stance. I'll ship you an Eversolo to test. We can ship it around.
In this case, measurements would be better than letting random forum guys listen to your gear. I think the Eversolo streamers have all been measured and shown to be pristine. So the more interesting thing would be to send your AVR to Amir and see if it's doing anything unwanted to the digital signal, anything is possible.
It sounds like you're actually using it day to day, but if you want to get to the bottom of this, that would be pretty conclusive IMO.