Natural… not accentuated in treble or bass. Coherent top to bottom… I have owned a number of planar / dynamic speakers… while listening to them they don’t sound uncoherent… until you hear a coherent one. I would rather some bass truncation over incoherence with split technologies or subs with different character.
Musical with natural timbre. After over ten years with season tickets to the symphony in “the audiophile seats, row 7 center”… I know what natural and musical sounds like.