Here is my review:
I have decided to take a different view on these headphones by doing a comparison with the Denon D7000s which are in the same price bracket. This is my first review, and I still relatively unexperienced in audio.
Like Windsor, it has also been a busy week with headphones. I received my HE500s, markl modded D7000s and Audio GD Compass on Saturday, and later sold my ATH M50S'.
Until Wednesday, I had been forced to listen to my music through my Cowon J3 connected to my Audio GD Compass amp through an RCA/Mini connection due to the fact that my desktop had broken down. This of course did not bring out the best in both headphones and I was thoroughly unimpressed, especially with the D7000s. The real listening was done later in the week with my Compass acting as both an amp and a DAC through a USB connection. All music files were either FLAC, 320kbps MP3 or VBR MP3 between 200 and 320kbps, although I did try some 192kbps MP3 and 128kbps AAC. I used foobar2000 with a flat EQ.
Packaging and Aesthetics
There is no doubt about which is the more glamorous headphone. As we all know, the D7000 is packaged in a smooth leather box, the headphones sit on a rumpled bed of satin and the cups are made from real Mahogany with a glossy finish. My D7000s were purchased with JMoney pads, which add to the comfort and soundstage of the headphone.
In comparison, the HE500 comes in a hard box (don't know what its made from) with a silver metal latch. The headphones are stored in foam block which has been cut out so that the HE500s are able to sit tightly. The cable comes separately, and is not attached to the headphones. The headphones themselves are a gunmetal grey which is moderately attractive and whilst the headband is extremely simple, it is very soft and reminds me of memory foam.
Cable: Whilst the D7000 cable is more attractive, it is more prone to twisting and tangling and is a little too long. The HE500's cable is more solid and is virtually untangleable although it takes a small amount of time to attach the cable to the drivers. Another problem is the after every use, the cable has to be detached if you want to store it in the box.
Earpads: The JMoney earpads are superior to the HE500's velour pads in every way. The HE500's pads have a poor seal, and the upper part tends to get pushed up after moderate usage. The JMoney pads have an excellent seal, are extremely comfortable and keep your ears cool. What is shocking about the HE500's is the crude way in which the pads are connected to the driver. It is difficult to explain, but see this video if you want evidence:
http://www.head-fi.org/forum/thread/555655/final-hifiman-he-500-review
Headband: Again, the D7000s triumph due to its comfort and ease of use. The headband is easily adjusted with a smooth clicking motion and although the HE500's comfort is good, it requires more force to adjust.
General Comfort: Initially, both were as comfortable as each other, but I found that I could not wear the HE500s for more than an hour. The reason for this is the larger clamping force and of course the weight difference.
Leakage and Isolation: For me, sound leakage is one of the most important aspects of a headphone and is usually a deciding factor on purchasing a pair. As an open headphone, the HE500s are virtually speakers. Even at extremely low volumes, sound can be heard whether you wearing them or not and this is not ideal considering that I live in a small house where not everyone appreciates my musical tastes. This is not to say that the D7000s do not leak, as they too are poor in this area (especially considering the fact that they are closed). In terms of isolation, the D7000 is marginally better.
Other non-Audio aspects: The HE500 is definitely more sturdy, is less prone to scratches and is likely to last longer. I always have to treat my D7000s with that extra amount of care due to its fragility.
Sonic Attributes: I wouldn't consider myself to be an audiophile, so I won't be going on about all the subtle differences, but I can appreciate a good sound. The first thing that I noticed about the HE500s is its openness and how this affects the soundstage. The soundstage I feel is close to perfect, as things aren't too close but also not to distant/unfocused. This makes the sound more natural and realistic, but also more revealing. To many people, a revealing headphone is appealing, but as a hip hop listener, a revealing headphone brings all the flaws of a track to the surface. Some of the artists that I listen to sample pre 80s soul and funk from vinyl, and use that sample as a base to their production. This results in a grainy upper frequency and slightly harsh snares. Its not as bad as it sounds, but it is definitely not perfect. Luckily I only experienced this with a handful of artists, with the HE500s producing more than desirable results for the others. Another observation I made is that the HE500s made lossy formats sound very poorly recorded due to its revealing nature.
The HE500's bass is somewhat embedded; it is not brought forward or recessed in any way but the impact is there. The bass is very detailed and controlled whilst the vocal clarity is extremely impressive. The overall clarity of the HE500s is great; I could hear every saxophonist's press of a key and every singer's draw of breath. The HE500s suited jazz very well, but was not so good with the other genres that I listen to.
The D7000 on the other hand, has a much smaller, but still good soundstage, and is less revealing. Lossy formats sounded much better, but more congested than the HE500s. There were no grainy treble or harsh snares, but the sound is much more closed. The D7000s produces bass with much more impact and presence but with the markl mod, it does not in any way overcome the other frequencies. The clarity is there, but it cannot match the HE500 for vocals. I feel that the D7000s are much better suited to hip hop and are phenomenal with world music.
Overall, if I had the choice, I would keep the D7000s. Although I was definitely not pushing the headphones to their limits with my Audio GD Compass, I feel that the D7000 is more suited to my musical tastes. The HE500s are a great headphone, and pound for pound they are probably superior to the D7000s (especially as they are $100 cheaper). They are much more neutral, yet they lack the 'fun' of the D7000s and other warmer headphones.