I have had the chance to listen to the MX4 today at a local shop. It was paired with thr Chord Dave and WA33.
Please do not take my impressions as what you would expect to hear if you were to try it yourself, as with all opinions out there.
Lets start with comfort, well built and comfortable, much better than the hot spot that one might experience with the regular Audeze headband. This level od comfort should be expected of premium headphones. The clamp is rather tight; but no major issues.
In general, not a positive sonic experience.
Bass was relatively well presented,Extended well, reaches deep. There is a mid bass hump that i could hear that could bother people, depending on one's preferences. Bass not was not particularly textured, but no major issues.
Mids were a flop for me, incredibly stifling and conjested.Very forward presentation of mids that gets in the way of enjoying the piece. It had a nasal tonality to it, like the vocalist had a blocked nose or some cloth was draped over speakers. Nils Lofgren's live album made this aspect particularly present. Although nasal, the mids shared similar characteristics with the 4, being buttery smooth, but its unnaturally in-your-face, muffled tonality killed it for me. Some may like agressive, forward mids so have a listen for yourself.
Highs was recessed with the lack of transparency. Cymbals do not shimmer, it decayed too quickly. Horns, violins, drums etc. do not capture the acoustics of the performance. Classical music sounded like it was recorded in a claustrophobic studio, lost were the natural reverberation of a concert hall. Perhaps it was the WA33 that the highs do not perform well.
Dynamics was one of the weakest aspects on this headphone, weak impact, with notes hitting like a pillow.
Being one of my top priorities for choosing headphones, the lack of dynamics hindered the enjoyment of music greatly. Bach's Solo violin tracks were used to assess microdynamics. MX4 was not able to capture small gradations in volume in quiet sections that many dynamic headphones are capable of (HD650 modded, HD800SDR). Macrodynamics were decent, large swings in volume were audible, but no where near HD800 levels. IMO dynamics are make or break for me. Large dynamic range is what differentiates a good recording from a bad one, MP3 from good SACD recordings, monotonous pieces or music that comes alive.
Soundstage was a miss, instruments were Conjested and closed in. ZMF Eikon, a closed headphone, was better able to present space and stage. Imaging was a blur, as with most planars I have heard. HE1000 and Susvara had better imaging capabilities.
Clarity was sub par. I had to dig deep and increase the volume to hear subtle details. People may like the MX4's soft and slick tonal balance, but at this price range, i cannot recommend a headphone with this level of detail retrieval. I had to struggle to hear the feet tapping in The Bucky Pizzarelli Trio's live album, while the ZMF Auteur and HD800 presents detail with ease without having to reach for the volume knob. Intruementalists in jazz quartets making small talk were smeared/inaudible with the MX4.
My short two hour listening session with the MX4 did not engage me. I was eager to get from one test track/album to the next. When I am rushing though tracks, that is when I know that the headphone or *insert gear here* was not the one.
To conclude, some may love the audeze house sound, and do not take these issues i have described a major problem. But to me, MX4 was a fail, and its older brother LCD4 did it better.
Before any MX4 owners flame me, let me say that I am only giving my own view of the headphone, not sugar coat it or rub egos. If you do truly like the MX4, you would'nt feel insecure and lash out. After all, music, as with wine tasting, your own experience matters most.