
No doubt, the HE400 are a very fun and practical headphone no question. The HE-400s bass is much deeper and will go down lower than the HE-4. However, I find the bass on the HE-4 to be tighter and more controlled. The HE-4 is a very fast headphone. Very spacious and airy. Really good for classical music. For more of the different kinds of pop, rap and bass heavy music I would go 400s hear. For the classical music, Jazz piano, female vocals - I would go HE-4. Sound stage is I don't know around the same. But the airy and spacious sound of the HE-4 might give the impression of a bigger sound stage. This is just my opinion.
It might be because he4 have velour pads by default and he400 leather pads - maybe when you would try he400 with velour ones it would be a game changer ? Just guessing ...































