Nad M33 vs Hegel H390... old question with a bit of a twist (ethernet and headphones)

Actually the L82s sounded amazing with the H390s. They definitely punched above their weight. I ended up getting the KLH model five speakers and they actually sound pretty good too! Especially since I added a pair of REL subwoofers. Good luck!

Most of our house is wired with CAT 5e. Will it help if I run Cat 8 from the switch box to the Hegel H390 or M33? Will check out the DROP THX as well as Audio U3. I am also a believer in what a difference the adapters make.
 I already have a couple of headphone amps but do want to upgrade...
 Thank you. 

Thanks so much guys. I had actually been considering the H 190 as well and agree that I might not hear the small differences. And will also think about the Cambridge EVO. I really like the latter company anyway.
I’m going to spend a day in Vancouver listening next week so will report back.

@badgerdms and @jjss49 funny you should mention AE because I do watch their videos and have no doubt been influenced. When I rang my dealer in Vancouver yesterday to tell him that I want to listen to the M33, he was hesitant and told me that I would be happier with either the H190 or H390. But I am certain that I want to listen to the M33 as well. Partly based on the excellent review of Hans Beekhuyzen.
I have actually not heard my new speakers and neither has the dealer as the KLH model 5 (new not vintage) literally just shipped. But I am confident that they are fairly neutral and do not have a party sound anyway. What I wanted to get away from - in my price range - was the sound of JBL 100s. 
I honestly am not attracted by the Dirac feature as it is just an extra piece of fiddly electronics. I can move the speakers around the room and listen...

@yyzsantabarbara Thanks for this. If you don’t mind, I have a follow up question. Our problem is that my partner needs to be able to use the headphones (while I am asleep 😂) with the TV. The TV could connect to the H390 via optical and use Home Theatre bypass. And we could use SPDIF to connect my IFI micro black label to the Hegel H390 BUT then the audio would come out through the speakers as well as the headphone jack. Defeating the purpose of using headphones at. Night.
Alternatively, if I hook up the TV to the Hegel and do not use HT bypass, then we will have to use the manual volume control on the headphone amp. Which is inconvenient as the TV and equipment are about 15’  from the sofa. 
I am totally happy to buy a new headphone amp at this point (already over budget anyway) but just need one in which I can connect it to the H390 and have a separate volume control remote for the headphone amp. 
Maybe I am missing something..... Thanks in advance.
p.s. Am going to re-run Cat 8 cables to the media room as they are better shielded.

@jjss49 and @badgerms Thanks again for all of your advice. This is what happened during my visit to the dealer in Vancouver. We started with the Hegel H390 hooked up to JBL classic speakers (in the $3300 CDN price range, same as my KLH m5). Sound was amazing, but it was the timing that struck me most. The music was controlled but with an underlying tension and restraint. Then we listened to the H190s with $20K speakers. Good but different and I was still torn. So I asked him to move the H190 to the same rack as the H390 and we alternated between the two with the same songs (would play half a song on the H390 and the other half on the H190). The dealer was very patient as he changed the speaker connection between the two units for 2 hours. He said that he had never done this before with the H190 and the H390 because usually customers are looking at one or the other. The differences were profound.
Here is what I noticed each time. The H390 had completely different timing, it was fuller and richer and felt like the music was immersive drawing me in. We would change back to the H190 and suddenly the same music was lively, faster but thinner in depth (don’t have the right vocab here). Every time.
The H390 felt like something I could never go back from. If I had not heard the H390, I would have been happy with the H190. But that door was closed. 
Luckily for the dealer, I had to catch my flight back to my small town so bought the H390. 
I am waiting for him to ship the unit after we figure out the headphone jack strategy (see post above in response to @yyzsantabarbara ). No way would the little coastal propeller plane allow me to travel with the Hegel 390 anyway ... Probably heavier than most passengers...
Thanks again.

@badgerdms Thanks for following up. I am super pleased with the Hegel H390. What I do notice is how different they sounded in the dealer's listening room paired with the JBL L82 Classics. The KLH Model 5s are not as bassy and dark. But they emit absolutely gorgeous midtones. I seem to be headed down the rabbit hole as I just ordered a new power cable - the brand suggested by @rockhound. 
As for the headphones, I just attached my IFI micro black label headphone amp to the RCA fixed out in the H390 and they seem to work fine. Though not the greatest sound. 
Does the Linear Tube Audio MZ2 have its own DAC? If connected to the H390, would it then use the Hegel amp and its own DAC (unclear on concept)?

@rixthetrick. Thanks for the link. Super interesting and I love his vids.

@mike_in_nc so agree about listening before buying. I listened to the Hegel H390 and am completely happy with it. But wished I had not bought the KLH model 5 speakers without listening. Don’t get me wrong: they are amazing speakers for $3K CDN but I do not care for the way they render the bass. For the same price, I would have bought the JBL L82. But actually in retrospect, I would have simply spent more on the speakers.