Bright is like all the tones are clear but increasing volume would make the highs have a 'piercing effect' in the ears. The highs are clear in this. sounds like treble is like high on default
Crisp makes the vocals in the songs much clearer. almost same as bright but no all tones have a balanced output.
warm is more like mellow where all is balanced and increasing the volume wont hamper the listening experience. it remains balanced at all levels. can listen to it for prolonged time. Dark/warm sounds have a fuller, richer, deeper quality about them
all explanation given as per my knowledge....high chance of me being wrong do correct me pls