Could you describe the setup, the process, the way data was gathered, and controls? This is a remarkable claim.
Sure, amps with similar architecture and good measured performance can be indistinguishable.
I am also searching for the reason for observed differences, as others have stated, in so many words.
The systems are described here:
https://www.audioholics.com/amplifier-reviews/ati-at4002
Game Room: Revel M20's, Oppo UDP-205, Oppo HA-1 (Preamp) sourced my Roon (network)
Living Room: Revel Salon2's, Oppo UPD-205 Emotiva XMC-1 (Stereo Reference mode) sourced by Roon (USB-DAC)
My systems have changed as of late:
- Sold the HA-1 for the game room. Going Oppo UHD Direct (thanks to Roon)
- Added an LA-4 for a two channel mode: Oppo UDP-205 -> LA4 -> Salon2's.
Directly comparing these amps in my systems, I find it unremarkable that completely different architectures (which also measure differently) sound differently.
Are you in the Boston area? If so, perhaps I could demonstrate.
- Rich