Why not solves the problems you are having with your Sonos system?

What problems are you having with the Sonos system?  I would always regard Airplay as a last resort.

I notice that the sound quality is much better when I play Apple Music via AirPlay compared to from the Sonos App.

However, I can only hear the difference, when I play the music via my Port, I cannot hear the difference, when I play the music via my "small" Sonos speakers.

In the Port settings , is line-out level set to variable or fixed? 

Also, louder usually sounds better, and so unless you have a means of ensuring the same decibel level, subjective opinions on on what sounds better are notoriously unreliable.

It is via the analogue variable output, yes I know everything about sound levels and so on.

I have worked professionally with sound for many years, so I think I know something about sound settings etc.

I also know there are many on this forum who says that the sound via AirPlay is not better than via the Sonos App, - but I think it is.

As I wrote, this improvement cannot be heard on the small speakers and of course you have to know what you are listening for, but I experience an improvement, the sound is more airy and dynamic via airplay, when I play via my Port, connected to a powerful/dynamic power amplifier and quality speakers.

This is a discussion that regularly appears in this forum and sometimes I feel that the users who participate in the discussions are people who are satisfied with the sound, just the ump-ump sound comes out of their 2 Play1 speakers. 

I live in Denmark and have sometimes thought that when the difference cannot be noticed by others, that Apple perhaps might be linking to another music server in Denmark, a server that other parts og the world do not have access to.

But I'm logging out now, I've told what I'm experiencing.

But I would just encourage Apple to get lossless sound on the Sonos App. a.s.a.p.

Unfortunately, Apple does not maintain a presence here in these forums. 

I think everyone knows that, it was just written to draw attention to where the ball is right now, in terms of a better Apple sound quality on the Sonos app, but you got your 2 points ;-)

Your last sentence of the previous post suggested that you weren’t aware. Or perhaps I inferred that. In any case, it’s a true statement.
 

I’d certainly agree with your sentiment, though. I would love for Apple to dedicate additional resources to the Sonos community of users. There are many things they could do to help. 

@Gert_4 .  You may well know a lot about sound.  That does not change the fact that subjective, non-blind comparisons of audio quality are pretty much useless.