Warm and detailed mids, great bass extension and impact, lovely stage that is more reminiscent of the original 009 when running on Megatron XL, smooth and non fatiguing treble, great timbre. I much prefer this headphone over the X9000 (I didn't like that headphone at all really)

I would highly recommend the 009D for it's musicality, great technical performance and non fatiguing listen unlike the previous 009 & 009S.