Hey, just wondering what sort of EQ you guys would recommend for these cans. I'd like something that really kicks the sub bass for my rap music. If it helps, my amping/ DAC is in my sig. Also Im not fussy about something external or a software, this will be a desktop set up.
HD650 are simply not a sub-bass heavy headphone. It's the one and only true weakness (versus many other imagined weaknesses some will attribute to them.) You can always crank up anything below 40Hz which is where the roll-off begins, but you may be pushing into distortion as well. HD650 is excellent in many ways. Extreme sub-bass for electronica & rap is not among those strengths.