Best I can describe it is you hear instruments arranged in space (a sort of sculpture), not a mush of sound. I am especially interested in operas and symphonies. but would also like to hear about smaller ensemble work
An example of an orchestral recording that captures the 3D space and soundstage is the Shostakovich Symphony No. 1, Bernard Haitink conducting the London Philharmonic on Decca. Excellent recording and performance.
For solo and small ensemble I'll suggest the label M-A Recordings, which creates audiophile recordings with minimalist miking. There is a free hi-res sampler for download here: https://we.tl/t-TyJKu9Bvya (created for Steve Guttenberg's Audiophiliac YouTube). The solo cello tracks have some of the best cello reproduction I've heard.