Hi everyone. So I just received the HE-400 yesterday. I have to say there are certain things these do very well but in some other areas I feel quite underwhelmed. Separation and detail are actually really good on these. comparing against the HD650's, the music is much more crisp and definitely faster. One point of concern I have is that the volume levels seems a little light.
My first thought was that these were not getting properly amped off of my Little Dot MkII amp. Is that amp a poor combination for the he400? I noticed when driving the senns, I wouldn't have to turn the volume knob too far for the sound to get loud. With the HE-400's however, I feel like I need to really turn the volume to get it to the same level of loudness.
Another thought was that I am just a little too use to the forward mids of the sennheisers. HE-400 definitely showcases the background instruments more and the mids definitely feel like they are sharing the spotlight with the rest of the music. Maybe it is this recessed mid quality of the headphones that are causing the music to sound not as loud due to the mids not being as forward. I know that the HD650s sounded louder than the HD600s at the same volume level so my suspicion is that the HE-400 just has this characteristic due to the lower emphasis of the mids.
I think the HE-400s are pretty great but I do feel I need to get used to this signature. These are definitely not what I'd consider love at first sight. I'll definitely give these a good chance and plenty of burn in. It is quite a change so I will be extensively listening to make a decision before the return window ends. I would like everyone's input though and if I am running these incorrectly.