After watching Sajid's video about the Susvara amplifier, I decided to switch my amplifier from Yamaha as3200 to Accuphase E4000 because he thought E5000 was one of his favorite three (I think E4000 is more cost-effective). This was a successful decision, but the only thing to note is the phase. The Japanese phase is opposite to the international standard. When I first listened to this amplifier, I thought the sound was so strange. After considering various factors, I found out it was a phase issue, and I needed to turn on the invert-phase button.
Past amplifiers (time series): Audio Valve Solaris, Pass Int 30a, Accuphase E380, Luxman L509x, Mark Levison 585, Hegel H95, Yamaha As3200 and Accuphase E4000.