i am looking for a new headphone, to compliment my he-500.
I am looking for a headphone with a good soundstage, imaging and details. I find that my he-500, are lacking a bit in those areas.
Could that be a l500 or l700?
I have never head Stax before. I am interested in experience the resolution, clarity and speed of Stax.
Is it a big difference from planars?
I can't comment generally on Planars, however comparing it to for instance Audeze LCD 2, I can say the difference is quite big.
In my opinion, nothing comes even close to electrostatics when it comes to overall listening pleasure, imaging and details. Soundstage is such an abstract concept, but I would say most would find HD800 soundstage more impressive (bigger), but to say it is in any sense objectively "better" is wrong.
L500/L700 have incredible speed, detail, soundstage, realism of tone and so on. They are simply the best imo. They are however quite a bit "thinner" sounding than a planar like the LCD 2. The LCD 2 feels "thicker" and "heavier". Less quick. I can't say its objectively better or worse, it all comes down to taste.
As for the L500 vs the L700, in my view, unless you are 1) filthy rich and 2) prefer the slightly more dynamic (v-shaped) sound of the L700, I would say always go for the L500. Having owned the L300, L500, SR-007 mk1 and listened to many others stax including the L700 and 009, I have to say that in terms of "technical prowess", they are shockingly close in performance. The 009 and 007 are a bit in a league of their own in terms of serving up every last little detail of the recording, however the L300, L500, L700 are so close that for any practical purpose the difference is irrelevant. What is a lot more important is the overall sound signature and your own personal preference. For instance, I loved the O2s, however they are a bit too laid back for my taste. It makes them a lovely generalist headphone that can handle ANY genre with ease, though they lack the sheer intensity of the L series or 009's.
Comparing the L500 vs L700 (I am assuming you will be going for the Mk2s, which you should - plastic headband breaks a lot):
The L700 have a bit more lower end, and a bit more higher end, making them sound a bit more impressive during A/B. They are more dynamic, more "wow". The L500s are very similar, however their overall sound is more even tempered. In terms of resolution, I honestly don't think there is any difference at all. I may be biased, but I legitimately couldn't tell any difference in terms of detail / resolution. Sound stage appeared a smidgen wider on the L700s, likely because of the pads being thicker.
I think that for those of us who wants to end upgradeitis, have ONE headphone and call it a day, the L500 is the most intelligent purchase one can make. It sounds better than the HD800 or any other dynamic or planar I've heard, has one of the most even sounding FRs (to my ears), are great for basically all genres (except bass centric music, get a sub woofer), and never gets tiring or sibilant. On top of that, they are way cheaper than other headphones while sounding better.
The reality is that at this point, there is no "objectively better". I would say estats are objectively better than dynamic and planar headphones in certain regards (speed, clarity, detail) however in other regards they are not. Mostly it comes down to taste. I think the L500s are the perfect match of flat, real sound while being exceedingly exciting, and even affordable. You could pay double for the L700, however would I say you are getting objectively better sound? Definitely not. If you prefer the L700 sound however, then it might be worth it in the long run, depending on how hard it presses your budget and how much you prefer the L700.
If you are purchasing blind (i.e can't compare them), go for the L500. I think they are essentially the safest purchase that can be made in the estat world. Oh and by the way, I used to run it through a 252s and I don't think it does it justice.
edit: Oh and just so its clear; I would never bother with a non estat headphone ever again. If I were to sell my estats, it would be because I was getting out of the audiophile hobby completely. I would never bother with audiophile headphones that weren't estat. That should tell you how much I prefer them.