Intg Amps: Hegel 590 vs NAD M33 Masters vs Gryphon Diablo 120

Hi All: I am getting an itch to upgrade my integrated amp from Hegel 190 to something more robust that facilitates future speaker swapping.  And no, I'm not presently interested in separating components that much further (e.g. separate DAC; separate amp; clock; etc. etc).  I mainly interested in the following 3 on a used basis:

Hegel 590 OR NAD Masters 33 OR Gryphon Diablo 120

Max budget is $7500 if I choose to go towards the Gryphon (used), but curious if it's really THAT much better.   I'm particularly interested to hear from people that have had or auditioned at 2 out of 3.  The room correction on NAD is very appealing but I quite like my Hegel and it's tight control, and so something nice about staying true.


Current Setup:

* Unideal Brooklyn Apartment living room into Kitchen

* Hegel 190

* Monitor Audio Silver 7G 500

* Pine Tree Audio Cables

* Dual 1216

* Schiit Mani 2 (though I hear the phono preamp on some of above may make this superfluous)

* Spotify/Tidal (main streaming source)


Of the amps you mentioned, I have heard two and they are very different. ( Hegel and NAD)  Great, but different. Unfortunately, it was an apples to oranges, different dealers and rooms listening.  I have a real soft spot for Hegel and not for NAD. The NAD is supposed to be a Purify, but I was not impressed. Maybe all the digital stuff in front. Don't know. Maybe I like the distortions from the Hegel. They were on Wilsons which are pretty good.  I heard the  NAD on B&Ws which I do not like at all. Don't get me wrong, both are serious great units. Just my preference. 

Your weakest link, kind of stretching to call it weak, is probably your RIAA stage. 

Do look at the actual bitrade of the files you are streaming. They may not be as good as you think. 

Have you considered an outboard DAC?  I am not sure the Hegel ( or NAD) internal is as good as it could be. Not bad, but not great. I auditioned the Hegel with a Qutest, the NAD with it's internal. 

Room correction can be critical, but do you need as complex as Dirac?  My room is too bright and being a LIVING room, no treatments are forthcoming. I put an Antimode on the sub ( single family so I can run a sub) but on the mains, I find just a traditional tone control to balance very nicely. My speakers are pretty flat in free space.  I could do that in JRiver, but I find some CDs I need to adjust a little so for now, old school tone control for the treble.  Your brain will "pattern" the room and unless things are really bad, fix a lot of EQ issues. You get used to it, or as the subjective reviewers say, the "electronics needs weeks to burn in". Really, it is their brain adjusting. Dielectrics form in hours, not weeks. 

I can contribute that I have owned the H590 and found it a formidable amp.  Plenty of power, a DAC that reviewers gush over, and Hegel's design philosophy that the amp should add nothing to the sound.  It is smooth and neutral.  I would look for one slightly used.  Only sold it when I decided to move up to the H30.