Haha are you referring to me as I am selling one too
In regard to your opinion about the sound being flat I somewhat disagree cause I compared dx320 vs wm1z m2 vs dx300 and is not far by that much from 1zm2 in technical realms.
What really changes is sony has s-master, sony gen3 golden caps, kimber kable and some new wizardy secret silver and gold ratio solder.
To my ears sony 1zm2 is more lush and thick and stronger in bass slam and mass. More refined delicate treble zing cause kimber kable.
Also the sound is more musical cause of s-master. It is also more organic and textured as sony use’s alot of film capacitors and very high quality chips….
On the other hand you have dx300 + amp 12! If you hear that setup you will be very impressed it has outstanding synergy and sounds like a very high end highly refined desktop system. I was very impressed and I will admit shocked as a first impression listen. Dx300 with amp 12 sounds better then dx320 with amp12 and even stock amp
And yes I am selling my dx320 to get my wm1a m2
But by no means dx320 sounds bad!