Amps, Speakers: I have several very familiar CD’s I bring with me:
Duet: Barbra Streisand and Donna Summer, No More Tears (enough is enough). The blend and singularity of their voices is incredible (even if you don’t like them as artists), you hear differences readily.
Casandra Wilson, Blue Light Til Dawn. Either she sounds like Cassandra or ’off’ a speck, and a lot of dynamic music by amazing musicians to hear.
War of the Worlds, Jeff Wayne’s, with Richard Burton as narrator. Same as Cassandra, Burton’s distinctive voice: right on, or .... and a lot of dynamic stuff they created, Death Ray, .....
Friday Night in San Francisco: 3 guitarists, L/C/R assess imaging, distinction,
others, but those always go with me.
CD Player: after you find the best amp/speakers using the same CD player, then try other CD players than the one used, but, switches, interconnects, level matching, the room, it’s hard.
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Phono Stage/Streaming: I always say buy where you can return, and listen at home in your system.