I have heard them all , the new E4000 Accuphase. Has now a very high800 damping factor ,vs the very good E480 it’s noticeably better it has a very natural balance ,even at low volume the best of the bunch , their patented volume control
matches it’s impedance ,and new board ,has2-3 % lower distortion .I like thsttheMeters are now bigger and inset , out of the integrated amps mentioned
the E4000 is the most refined and detailed besides the Gryphon , and for late night listened it has a button to enhance
the performance at lower volumes . My friend at our audio club bought one
the-only one that was a little better was the Gryphon Diablo. ,which now has been upgraded ,I have not heard yet at $23k a Big jump in price.
These were 6 high end integrated in the shoot out including dartzeel which was a a bit too warm for my taste but still very detailed .