Bela Fleck Cosmic Hippo is great and very dynamic, really tests how low your system can go
i also like Flim and the BB’s - Big Notes, great dynamics
I always also listen to Getz/Gilberto (in DSD) as the ton of the sax and imaging is great
If i could pick only one instrument to test timbre rendition i would pick a piano... Because the sound of a live piano is well known at least as guitars, and the way the transients attack goes on a piano is very dynamic and the tone timbre decay so complex , the bass so deep ... Piano sound is ideal to test acoustic of room or playback system embeddings ... It is very hard to set a piano right for recording as well as for playback in a room ...
Then to test imaging and soundstage , i use an audiophile level recorded opera : Kurt weil with Lotte Lenya " the three pennies opera" ... The recorded acoustics is stunning, with the singers walking and turning their heads, and in a good listener acoustic room , as my last one, they moved all around me and beside me , as if they were NO SPEAKERS ... In my new room i am nearfield with smaller speakers , the soundfield is stunning but less encompassing of my listener position , because so well is my acoustic corner well done , it cannot compared with a room including 100 Helmholtz finely tuned resonators .. This is the best interpretation and the best recording ... Astounding ... https://www.youtube.com/watch?v=qR33bL5aNTk&t=2244s
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