Listen to this guy. Give your ears some time to get used to. At least 20 minutes imo. As for subbass, you can decrease it less and is what I do as well. HE-400 has a bit too much bass in the 200~600Khz area IMO which veils the mids quite a lot. To those that do not eq down the midbass and just the trebles, the whole sound sounds veiled because both the mids and treble has lost presence!
Also for those that say EQing reduces SQ. I believed the same as well. But when you learn to EQ well, you get to know that it does not decrease SQ at all. It's all about the balance between the bass, mids and the trebles as a whole since every frequency bands affect one another IMO again.
For those that wanna try out my EQ settings:
I use Jriver so I use the bands used there.
with using parametric EQ, decrease 8khz by -3db with bandwidth of 1.
I'm using these settings with jergpads as well btw. Also, some alteration from that as base will be fine according to your personal preference since I've been changing myself as well. But with this setting, I don't get treble spikes, and overall a balanced sound with mids clear and bass present when called upon which is how it is on neutral phones.
Please don't bash me if you don't like these settings haha... I just wanted to share :)
Sorry for the noob question, but Isnt the spike around 9khz?