My only discovery in audio is vouching for a piece of gear so good it is is erroneous..
I vouch for the three embeddings controls and expecially after electrical and mechanical embeddings the acoustic treatment and control..
When you have a room under control no UPGRADE is a tentation any more..
Why? is it because my system is the best ? not at all...
It is because music is natural and living and vouching for a better amplifier will appear to me useless rant...
Acoustic is key to audio nothing else...