Neither one of those cans is either bass heavy or even emphasized. You should probably read this:
The HE-500 takes a serious (usually) desktop amp, like the Schiit Asgard, to properly power them.
not a bass head, so that's not a problem. i think any headphone would give me more bass than the AD-700, and that'd be fine. i enjoy the punch the PortaPros can deliver and i know for sure those aren't bass heavy.
so do you have any recommendation based on the information i've given?