dasikmunkythey could possibly be problem is no one knows. honestly i have both the 4xx and 6xx and i prefer the 6xx by just a tiny bit but imo those are more on the playing field at least right now. these could end up being a rock star who knows. but with the hd650 being possibly discontinued imo i would for sure consider a pair of 6xx before those go away also. ill be grabbing a pair of these to play with and see how they do.
mastershakeWhy you prefer the 6xx over the 4xx? I got my 6xx recently and I'm thinking on pulling the trigger on the 4xx according to some reviews I read.
bigshelHow different are they? I know the HE4xx are more forward and have some more bass, but what about sub-bass? I miss a bit of sub-bass on the HD6xx, specially coming from closed-back ATH-M50x. Also, what amp do you use for them? I currently own a Hifime Sabre 9018 DAC/Amp as portable/backup source and a D30 DAC & Little Dot I+ amp (w/ Mullard M8161 tubes). Do you think the LD I+ hybrid amp would be a good match for the 4xx? It's meant to best drive low-impedance cans, and I heard it has low output impedance (IDK exactly what impedance, nobody seems to know).
Eli35Sub-bass is really good on the HE4XX. Like most planars, they are vocal forward. I like them for my hip hop, jazz, r&b and the like due the bass and vocal qualities. The 6XX I like with classical and more instrumental music
I use the Topping DX7 to drive them or the iFi iDSD. Both are good.
I don't think you'll have a problem driving them with the setup you have.