I have dozens of listening and further my crazy life of Hi Fi, seeking the "holy grail" in terms of sound.
I am 60 years old, and to this day, although I've never heard of a further exorbitant prices, the PROTON AM-2 is the best I have ever heard. I also 4 PROTON models, including AM 300, the 540, the 520 and this is the AM-2 that I prefer in terms of punch, open soundstage, ventilation.
On the CD "live" we really believe the concert. Other elements of my string = CD player Philips modified according to the recommendations of the journal The JBL Monitor Loudspeaker + 10 speakers, with a modulation cable between CD player and amp from England or the wire is visible as a mold plastic, which means that there is no shielding.