Stax SR-009 Electrostatic Earspeaker (Playback 54)
Best Headphone Ever
March 7th, 2012 -- by Chris MartensSource: Playback
What, then, is the sound of the SR-009? The answer is that the sound of the Stax will always be an uncannily revealing and nuanced rendition of the signature sound of whatever components you happen use to drive them. Make a change—any change—in your playback system and the SR-009 will immediately report the sonic results (whether for good or ill). No nuance is too small for these ‘phones: they detect and report on every single element in the signal path with almost disarming ease and candor.
During my time with the SR-009, I had the privilege of powering the headphones with three different world-class electrostatic headphones amps: the Woo Audio WES ($5000 - $6000 plus, depending on configuration), the Kevin Gilmore-designed Head Amp Blue Hawaii SE ($5000), and a pre-production prototype of the upcoming Cavalli Audio Liquid Lightning (projected price, $4250). As I listened through the three amps, I was struck by the fact that the apparent “core sound” of the SR-009 changed in distinctive ways every time an amp switch was made. Each of amps offered a compelling, though distinctive take on “state of the art” sound, and what floored me was the almost shocking extent to which the Stax headphone took on the sonic personality of each of the amps (almost as if it became a whole new headphone every time it was fed by a different amp). If ever an audio product were a true sonic “chameleon,” the SR-009 is the one.
Similarly, I tried some very subtle tuning changes in the Playback reference headphone system with the SR-009, such as switching between two slightly difference versions of the same brand of balanced audio interconnect cables I had on hand. Instantly, the SR-009 reported (and in no uncertain terms) the exact sonic differences between the similar but not identical cables, or any other components I substituted within the test system. Where some headphones reveal sonic differences between ancillary components in a general way, the SR-009 reveals the impact of system-level changes in much more detailed, explicit, and precise ways. For this reason, prospective buyers will want to be very careful in selecting components for use with SR-009s. The good news is that these ‘phones will tell you precisely what your system components are doing, but the potentially not-so-good news is that they may expose performance shortcomings you’d prefer not to know about.
Some electrostatic ‘phones I’ve heard exhibit audible limitations in terms of bass power, definition, and depth, and also show a certain reluctance to tackle large-scale dynamic swells with appropriate gusto (both of which are, by the way, areas where today’s finest dynamic and planar magnetic models tend to perform very well). The SR-009, however, shows no such limitations. It can do killer bass with the best of them, and can do the full spectrum of dynamic events—from the subtlest microdynamic shifts in emphasis right on up to full-on moments of orchestral bombast—all in a very convincing way. Indeed, I would say the SR-009 offers state of the art bass performance and dynamic agility.
After careful listening, I have concluded—as has my colleague Tom Martin—that Stax has delivered a milestone headphone in the SR-009. That’s because the SR-009 is qualitatively better than every other headphone we have heard thus face, and this qualitative difference enables the headphone to cross a meaningful threshold in terms of fostering musical involvement. Interestingly, every member of the Playback team who heard the SR-009 independently arrived at the same conclusion: the SR-009 simply draws listeners closer to the heart of the music than any other headphone we have tried.
I won’t tell you the SR-009 “trounces” the other top-tier headphones on the market, because that would be untrue and misleading. It’s just that the SR-009 is a small but worthwhile increment ahead of its competitors, not just in one or two performance areas, but across almost all of the most important areas of performance. This is what sets the Stax headphone apart. In a separate but related Playback review of Woo Audio’s terrific WES electrostatic headphone amp, Tom Martin observed that the benefits of the SR-009 (when powered by a top-shelf amp) include its ability to sound “more transparent than other headphones, … lower in distortion, … and more dynamically accurate.” His comments are spot on; the SR-009 is a true benchmark design.
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Comments
So how do you account for this improvement that warrants a doubling of the price: thinner diaphragms and stiffer stators? I doubt that explains it all. What about the amplifier? Can Stax explain what the performance upgrades are, and how they warrant a doubling of the price?
Hi Gadgety:
You pose a fair question. I'll tell what I know based on my investigations thus far.
1) The differences are not solely attributable to the amp, good though the Woo Audio WES is. I know this because I have heard a pair of Stax SR-007 MkIIs alongside the SR-009s with both headphones driven by the very same WES amp. I found there was quite a big performance gap between the SR-007 MkII and the SR-009, and since the same amp was driving both 'phones at the same time, I have to think the difference was attributable to the superior design/execution of the SR-009.
2) I'm not sure whether you will find Stax's information on the SR-009 compelling or not, but to see the company's own explanation of the improvements made in the SR-009, follow this link: http://staxusa.com/Earspeaker/STAX-SR-009.html
3) Do the improvements warrant a doubling in price? Only you can answer that one.
As I mentioned in this review, today's best dynamic and planar magnetic 'phones can get you fairly close to the performance of the SR-009 for much less money (think of prices in the $1k - $2k range versus $5250 for the Stax). Still, in high-end audio (and the SR-009 is unquestionably at the high end of the high end), the final 5% or so of performance has traditionally been the hardest to achieve and also the most expensive. This is a roundabout way of saying that the value proposition of the SR-009 (and of the high performance amp it will require) is very much in the ear (and wallet) of the beholder.
Personally, I can't afford the SR-009 or the amp I would need to match with it. So, I content myself (quite happily) with a set of planar magnetic 'phones and a good but not painfully expensive amp. But that doesn't stop me from admiring what Stax and Woo have achieved, or from dreaming that one day I'll perhaps figure out a way...
Best, Chris Martens
Chris Martens
Editor, Avguide.com/Playback/The Perfect Vision
Chris, you mention what you feel to be a slight upper mid-range rise. In my experience these phones require careful matching of amps and/or sources for them to sound natural in the treble, at least if your system is really open up there. In my case it helped to substitute 6FQ7s for 2 of the 6DJ8s in my DIY tube amp. Quite a lot of people have commented that the 009s sound bright with different amps; of course, there is considerable variation in the perception of highs via headphones due to outer ear differences (not to mention HF hearing loss!). Tyll Hertsen's measurements (at Inner Fidelity) show a bump of about 3 dB around 1K. They also show that the bass below about 50 Hz is down 3-4 dB compared to the upper bass/mids. I believe I hear this and that it's not caused by the source or amp or cables; did you not hear it with the Woo? In any case these are wonderful phones, for all the reasons you mention.
Tony Reif
Hi tonereef,
You do raise a good point. The SR-009's are VERY sensitive to tubes or to any other elements of the system. The Stax 'phones can and do expose even the smallest system changes or tuning adjustments.
I experienced no brightness problems at all when the SR-009 was used with the Head Amp Blue Hawaii SE and the pre-production prototype of the Cavalli Liquid Lightning, and only occasional trace amounts of upper midrange brightness (on some but not most recordings) through the Woo WES. The tradeoff, however, was that the Woo--as configured with Sophia driver tubes and Shuguang 50 Years Treasures output tubes--was arguably the most transparent/open-sounding of the three amps. According to Jack Wu, you can temper those trace bits of midrange forwardness observed in the WES either by making a different tube choice or by ordering up the WES with the extra-cost V-CAP options that Woo offers.
In my experience, perceived bass output levels varied somewhat with different amps, too. I would say that in general terms the extreme low end of the SR-009 may not be **quite** as full-bodied as that of a properly driven Audeze LCD-3 or LCD-2, Rev.2, nor as rock solid as the bottom end of an also properly driven HiFiMAN HE-6. But with that said, I would add that the SR-009's low frequency balance often tends to seem more consistent with the sound of live music (most of the time, at any rate), and that its pitch definition and transient speed are spectacularly good. All in all, I could live happily with the SR-009's bass performance; it certainly didn't seem "bass shy" to me, and I'm normally quite sensitive to (or even finicky about) such things.
Chris Martens
Editor, Avguide.com/Playback/The Perfect Vision
Hi Chris,
Would be very interesting to read a comparison piece between the 009s and the Audez'e LCD-3s. Any news on whether you guys have/are going to have a pair of the new Audez'e flagships in soon?
Best Regards
Speakers: B and W 802 Diamonds, Bose Lifestyle 35, Audioengine AP4 Bamboo
Headphones: Audeze LCD-3, LCD-2, Beyerdynamic T5p, dt880, AKG K701, Ultrasone HFI-780
IEMs/Earbuds: Westone 4, Mons
Hi dyl1dyl:
A review of the Audeze LCD-3 will be coming soon in Playback.
Best,
Chris Martens
Chris Martens
Editor, Avguide.com/Playback/The Perfect Vision
Chris: When I purchased the WES, Jack Wu suggested the ultimate tube upgrades and internal parts upgrades, I purchased both. Some time later, when the SR 009 was released, I purchased those as well. Before I come off sounding like a "big spender," let me mention that as a teenager in the 1950s I was designing and building my own audio equipment, and into the 1960s building "top rank" amp and preamp kits. A successful legal career enabled me to reach the ultimate audio heights in the 1980s. In the early 1990s, as empty nesters, my wife and I moved into a new townhouse condo community. Approaching retirement, I sold much of my system and moved into the world of earspeakers, at a small fraction of the cost of my ultimate system. (Stax amps and earspeakers and a fine CD player)
I must assume that your review process could not extend over the time frame of my listening experience (since my purchase of the WES), so I want to let you know about some long term developments.
When I purchased the SR 009s, Jack suggested that I bring in WES to upgrade the original chokes. (I have no idea what I am talking about)
Immediately I could hear a major improvement. At somewhere between the 200-300 hours of listening experience my audio "troops" and I felt that we had reached the full and final break-in... nirvana! Then, quite unexpectedly, somewhere around 700-800 hours or so, there was a further step into reality. Understand that we had already concluded that "nirvana are us!" But there arrived further clarity... not that we were experiencing any congestion on massed strings, etc., but even more transparancy appeared! On well recorded material, from FIM CDs to hi-res downloads, "YOU ARE ABSOLUTELY THERE"!
Live concerts rarely drive us to greater listening joy except for the participation experience.
ADR
I have listened to the Eagles track so many times and never got what you heard..Until now! Though I am hearing it through my FAD Piano Forte IX's. That is quite a revelation! Just to be sure I then plugged in my LCD2's balanced and it was not there!
Chris,
Just received my SR009's - and you are correct in your conclusion - they are essentially transparent, transmitting the audio characteristics of the driving chain, and thus potentially frustrating if the drivers are not as transparent as others.
Mind you I was initially startled listening to them to an FM signal during which I heard the musicians sliding their fingers along the frets - heads-up sort of reaction. This information via a standard (low) FM signal ??
That said I'm still running mine in via the Stax SRM600 but bear in mind that this amplifier is being driven by a Qol unit via Accuphase and Bryston sources, so while not Wu's, the driver's are not shabby under most circumstances.
Immediate impressions (Listening to the Decca recording of Ute Lemper) is that this is a very transparent transducer. Switching the Qol in and out has dramatic effects to the soundstage and timbre as well.
Equipment used for this opinion:
1. Computer files produced from DDPoweramp and Audiogate software.
2. Bryston BDP-1
3. Accuphase C2110 preamp with DAC30 option
4. Qol Signal enhancing unit
5. Stax SRM-600
6. Stax SR009 headphones.
7. HP Envy all in one PC, Windows 8, Audiogate Software 4.3 via Accuphase DAC30 SP/DIF USB.
Louis Hissink
I now have the set for almost 1 month. And there was not a single moment, where I have regretted the purchase. For the most part of the last 10 years, I had a Stax SignatureI headphone set with a SRM 006tII energizer. But somewhere along the line, I decided to buy a better headphone set, opted for the SR 009 headphone with the SRM 007tII energizer and bought them. Frankly, when I listened to the new set for the first time, I didn't expect the improvement in quality to be that big. While I always enjoyed the Signature set, the SR 009 really makes a difference in terms of clarity, reproduction of cymbals and basses, etc. And I don't even have a stellar audio system. My Cambridge Audio CD Player 851C is just fine along with some solid main plugs, XLR- and Cinch cables.
In that regard, if you can't afford to be all your stereo components high end, you can make concessions and still be happy. Some 20 years ago, a dealer told me to spent the same amount for player (phone, cassette, CD, tuner), and amplifier combined for the speaker set (in my case the Stax set). I always kept that in mind and in my opinion, he was right.
At last I would like to add, that in my opinion, the SR 009 is worth the 5.000 € you have to spent (in germany where I live).
It isn't easy to quantify, whether money for an item is well spent or not or is worth the amount. In my opinion it depends, what you expect from the item to be bought. When it comes to listened to music and enjoying life, the SR 009 is a good choice.