Okay just got a used set of these a couple hours ago. in amazing condition thanks to a fellow head-fi enthusiast (thank you~!).
Just now getting to listen to them so here are my very initial impressions. We'll see how accurate my immediate impressions are in the long run.
I'm not new to the game, and have listened to many sets, so I feel I can make a pretty good immediate assessment.
TL;DR - The HD700 has a baroque character filtered through a futuristic presentation of sound. Slight unnaturalness offset by supreme technicalities. Not an all-rounder, needs to be fed with the best music of the highest recorded fidelity (I'm talking about the recording process and performances, redbook format is fine here). Sounds very good with classical recordings.
Live Assessment
Musical piece: Mozart - Sinfonia Concertante, Concerto for Violin & Piano - Midori, Imai, NDRSO, Eschenbach (2001) [FLAC]
Right off the bat, I can tell already the sharpness that could make these averse to people. Somehow, these feel like Sennheiser merged consumer sensibility (HD598) with HD800 technology. They are both accessible yet niche.
I've owned the HD650 twice, and I think I'll look into getting an HD600 someday. The HD650, from my memory manages to present itself more natural while at the same time being relatively muted. Same goes for the LCD2 and I feel the HD650 / LCD2.1 trade off in their realism of presentation within certain frequency ranges.
It seems that the HD700 is a bit too 'immediate', really quite borderline. At the same time, you can hear the brilliance of the expression without inhibition.
They are bright like my Denon D2000, while being more tonally coherent and of course, more spacious.
Musical piece: Liszt & Dohnanyi - Works for Piano & Orchestra - Kocsis, BFO, Fischer (1989) [FLAC] (Philips 422 380-2)
Deciding to stick with classical for a bit, this time with a piece that has more representation from the piano. This is such a good change from the rest of my kit. Sennheiser's lower range cans (HD555, 598, etc) are left in the dust. I think they are great cans, but they have nowhere near this level of transparency, detail, and separation. In fact, I'll say right now that this has much better separation than what was experienced with the HD650. This piece is very demanding, and every resonant strike of the piano is kept fully intact with the rest of the orchestra.
The HD700 is like listening to glass. There is none of the grain that is present in the 650.
Musical piece: Squarepusher - Damogen Furies
Okay, I know this is going to be rough. That's why I chose this album. And yeah, no way around it. There is nothing 'smooth' about the HD700. This is no easy-listening kick back listening device. They are more tilted towards being ear scalpals. Ouch!
Give me my LCD2 and D2000s please. Lol.
It's like having an IEM jammed into your ear. The thing is, you can try rolling off the upper frequency range, and it will sound more like a consumer tuning.
Not enjoyable, but is it the recording itself? It is a very squelchy, resonant composition. It also may not have the dynamic range, or is rather too constant in the ranges its electronic instruments present themselves, becoming grating. But it is Squarepusher afterall.
Musical piece: BT - Artifacture / Indivism
Incredibly well produced for an electronic piece. BT is going to bring his impeccable production style for certain. And, it sounds absolutely sublime.
For a short bit, I'm going to turn it up on Indivism. The O2/ODAC feeds this perfectly. Solid and unfettered. Power wise, these appear to have the same requirements as my LCD2.
Musical piece: Prokofiev - Romeo and Juliet - RCO, Myung-Whun Chung
Back to classical, these seem better suited. They can be brash, bombastic when timpani is called for. Really great rendition of the Montagues and the Capulets. There is a slight unaturalness to the HD700, a bit of artificiality. Yet they are balanced by very good technicalities. Even if the tonality is not perfect, it nails speed, resoltuion, and has plenty of dynamic.
Bass is perfect, details are present without overwhelming. Plenty of depth.
This is really an incredible listen. It is these moments that sells the HD700. So far, the most dynamic music has played well with it.
Completely sold on these headphones for just these experiences alone. Manages to be both intimate and grand at the same time. Weird.
Musical piece: Handel - Neun Deutsche Arien - Emma Kirkby, London Baroque
We are getting into vocal territory of the highest quality. In this recording, there is no trace of some of the HD700 perhaps 'problematic' presentation. Dial up the sound if you wish. It will just put you right in the front row listening to an exquisite performance.
For this piece and similar HD700>LCD2>HD650
I'm very well acquainted with this recording and performance. This is audiophile grade sound right here.
Musical pieces:
Erno Dohnányi - Chamber Music - Kocian Quartet, Beethoven String Trio
Rimsky-Korsakov - Great Orchestral Works - Rotterdam PO, Zinman
Mendelssohn - Symphonies, Dohnanyi, Wiener Philharmoniker (2010)
Umh. Wow. If you only used the HD700 for popular music (ie. music made for radio that uses a sometimes unhealthy amount of dynamic compression) you would be missing out on what these headphones are about.
Would I like the HD800 more? Probably. I've listened to them a couple times. I loved them. I think I'll be fine with these for a while.
Musical piece: Solar Bears - Advancement
I do listen to quite a bit of electronic pieces. HD700 will do great with the best of them. I'd say anything that has a lot of dynamic compression used, typically for rhythm sections, just turn the HD700 down a bit. Some people want to have a can where they can crank it a bit, get some of that punch from the drums. This is not the can for you. I'll have a $33 pair of Logitech UE6000s coming and honestly, they are very good, and will be more 'fun' for certain genres.
Turning down the HD700, the bass is till very audible, nicely balanced. Details are present. If you want to relax a bit, I think low volume is the key here. Not so with classical, as where you can turn it up for a short duration should you want. Actually, classical pieces demand that, as in live performances, there are brief moments of loud dynamic range.
Musical Piece: Kendrick Lamar - To Pimp A Butterfly
To my ears, this is next-level hip-hop. Production wise, it is part raw jazz recording, with a slightly hotter mix mix to come through on consumer devices. This one will sound better on speakers, and becomes a bit too cluttered on headphones. 'King Kunta' just rolls with this though. Foot tapping, but not street cruising if that makes sense.
Gary Willis: Larger than Life
Gary is an incredible bassist. Crispy, and on point with the HD700. bass guitar is quite upfront, and very realistic. Definitely a sweet spot for the HD700.
Bill Evans Trio - Explorations
I lost most of my jazz music a while back and will need to start recovering that library. As like classical, these performances are immaculate. Goose bump good.
Last little test. A bit of an unusual one, but important for myself.
Binaural test: using Naturespace app for iOS. It's weird because there are parts of the frequency range where the HD650 just excels at binaural reproduction of sound. To me, it is a testament to the naturalness of presentation of the HD650. With the HD700, I'm getting a bit of sense that some of the top end is scooped in such a way, that the white noise generated by rain, for example, doesn't sound as authentic and realistic as what it does opn the 650. To my memory. At the same time, lower frequency sounds, say that of wind rushing through a valley, is far more open and detailed. Bass was well done on the 650, and thunder was realistic if not a tiny bit distorted.
It's hard, actually the more I listen, the more holographic the HD700 becomes. I would really need to go head-to-head against the HD6xx series to make a proper comparison, as I'm just doing this off my memory and impressions. The HD700, does seem overall better, however. Thunder sounds have their characteristic timpani, and actually sound like they are coming from the clouds above you, rather than from a slightly distorted driver by your ear. Rain is starting to sound better overall as well. This is great, because I really miss my HD650s for their ability to render binaural sound. The LCD2, while having amazing technicality, just don't quite pull of the holographic magic and I think a larger part of this is where the drivers are in relation to the ear. Insect sounds, and again, wind, of all things, are excellent with the HD700. It get those very high-pitches of crickets and other bugs perfectly. It is a useful test, because we all know what these sounds actually sound like. Bird sounds and chirps, just a slight sharpness. I think I need to hear these against the HD800S too.
20minutes later of listening to nature sounds. Again, just a tad sharp up top. Wish I could almost mix it with 650 a bit.
Overall, very immersive.
Comfort: on the same level as my past HD650s (once the steel band is flexed a bit). Right now, there is a bit of clamp. My head is largely more obtuse than the previous owner, so we'll see.
Isolation: Yes, I know they are open. But these is some important acoustic isolation that is happening. When you put on the headphones You almost get a slight 'sea shell' or "Bose' effect. All outside noises, and for that matter the sounds coming from the driver get dialed in to what Sennheiser has specially designed. Ear pads and cup shape are impressive. Overall construction feels high-quality plastic. For the $400-500 USD mark is very very good. The plastic is practical, but may not feel as premium. It is high-quality for certain. What feels most luxury about it is the design and how it all comes together.
Early conclusion: Very impressed. On the same level of my LCD2 for different reasons. I'd have to do a real in-depth comparison against the LCD2, but it would come down to preference. Really, all the pieces I like on the HD700 can absolutely be enjoyed on the LCD2, probably to a similar extent. The LCD2, is an overall better all-rounder and largely inoffensive.
One thing that the LCD2 has, and even more so the 650, is they are just a bit sleepy up top. Even my D2000 gave a bit of sparkle to the top end that really helped. The HD700 does this even better while remaining stunningly clear. Still, the LCd2 has plenty of top-end detail. But it could use a bit of the HD700s excitement.
Strange headphone in a good way. It has a bit of dark tilt, with a brighter, sometimes resonant presentation.