FWIW the standard of audio and video is double-blind ABX[0] sessions, not merely A/B (and ABC/HR[1] for "fine-grained" comparisons)
> AVS and some car audio forums hold some pretty objective events
HydrogenAudio's community is (or was when I still visited) all about objective testing.
[0] http://wiki.hydrogenaudio.org/index.php?title=ABX
[1] http://wiki.hydrogenaudio.org/index.php?title=ABC/HR