Kontaktowałem się z ZMF w sprawie polecanych przez nich modeli wzmacniaczy.
Myślę, że mogę tu wkleić odpowiedź, dla potomnych, może się w przyszłości również komuś przyda:
"I will give you a few amp recommendations that we really love around the shop:
Cayin HA-3A/HA-6A/HA-2A - We really love the Cayin Tube Amp products (so much that we are an official distributor!) Their HA line is really amazing for the prices they go for and you really can't go wrong on an Atrium with any of them. I know this may come across as a sales pitch but we really do find the Cayin Products to be some of the best bang-for-buck value on the market and a great match with our headphones.
Feliks Echo MkII (or any of the Feliks Tube Amps, really) - This is also up there with affordably priced tube amps. This has a great sound for the form factor and meshes really well with the Atrium.
Chord Hugo 2 - This is the smallest of the recommended amps but this thing sounds anything but small. It is a small form factor, solid state DAC/Amp combo that sounds amazing both as an amp and as a dedicated DAC going into other amps. For the price it really can't be beat."