Pro 900 has a sharp treble spike (this makes electronic stuff too bright) and much higher than average distortion down low. If you are looking for "fast" bass (bump likely between 80hz and 200hz) consider the Q40 or if a bit darker is more your flavour consider the 700MKii. For good, linear, low distortion, flat (no bass emphesis) the Orthos are nice too. The 770s will never give you that "fast" bass feel as they have more emphesis in the sub bass area.
3/14/13 at 9:54am