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post #22066 of 24765
Originally Posted by DefQon View Post

Both extremely rare headphones as well the Sigma's as well in my opinion.

The SR-Gamma Pro is indeed quite rare now (as well as any Sigma) but I see a normal bias SR-Gamma from time to time.

post #22067 of 24765
Originally Posted by padam View Post

The SR-Gamma Pro is indeed quite rare now (as well as any Sigma) but I see a normal bias SR-Gamma from time to time.

Yep, thankfully I found one in original NOS condition with it's box for $300. The Sigma NB does pop up from time to time as well as the NB Gamma, but the Pro bias versions are indeed quite rare. The very last time (besides mine) Gamma Pro went up for auction sold for $700 that was early last year.

post #22068 of 24765

stax man is selling one of his omegas eek.gif


Hmmm... "stax epsilon" sounds nice.

Edited by MrViolin - 5/1/13 at 5:17pm
post #22069 of 24765
Originally Posted by padam View Post

You could try a pair of normal bias Gammas, they are not damped like the Pro version so might be more to your liking. Even now they are still way too underrated headphones.

Thanks for the solution, maybe I'll try those out one day. I was actually watching one on ebay about a month back. I think it ended up going for around $150 which seems a great deal as it has the same drivers as the 5nb.

About the T90s. I really wasn't sure what to expect when I plugged them in, much to my surprise they sound much like the SR-5NBs. eek.gif Bass, mid, and treble quantity is about the same between the two. Not quite as fast, but they've got a better decay and center image. At the moment I'm almost tempted to call them an improved SR-5. They have much the same tonal balance but sound more natural, have better weight, better separation, and detail retrieval. Timbre seems to come through better and with vocalists I am hearing it all(lungs,throat,body) rather than just the voice. Strangely they are less impactful and punchy than the SR-5s.(with the transformer box at least, about equal to it out of the T1). The SR-5 is noticeably more grainy though not in a negative way. The graininess has a way of making guitars more interesting to listen to.(Reminds me of Grado in that regard.)

At the moment I'd call the dynamics the weak point of the T90, but my choice of amplifier could be to blame. With my vintage receivers I really can't go past 8 o'clock or it gets much too loud and the noise floor is quite high. The Sherwood S6000 in particular is known to perform quite poorly at low volumes(first gen solid state), still it manages to outperform the S7210A with both pairs of headphones. The T90s through the 7 series amp has the same downfalls of the STAX through either amp.

Just as I feared this isn't going to be an easy choice, and I'll likely end up keeping both. One main advantage of the STAX pair is that it performs well with the vintage receivers and t-box. The T90 really needs a good head-amp and the receivers are much too loud when cranked up to their sweet spot. The Sherwood S-7210A has a 40 step volume pot. The beyers are dead quiet at 1, a little quiet at 2, and rock concert levels at 3. The STAX I run between 15-25, a much more usable range on the knob. For comparison my portable phones, the AKG K81 as well as my old Ultrasones, were happy at the same volume levels as the STAX.
Edited by MohawkUS - 4/30/13 at 10:58pm
post #22070 of 24765
Originally Posted by DefQon View Post

Yep, thankfully I found one in original NOS condition with it's box for $300. The Sigma NB does pop up from time to time as well as the NB Gamma, but the Pro bias versions are indeed quite rare. The very last time (besides mine) Gamma Pro went up for auction sold for $700 that was early last year.

I consider myself very, very lucky to have scored an excellent condition Sigma Pro for $700. 

post #22071 of 24765
Originally Posted by John Buchanan View Post

I consider myself very, very lucky to have scored an excellent condition Sigma Pro for $700. 

$700 for a Sig Pro is a good deal. Considering the NB goes for around $650-800.

post #22072 of 24765
Originally Posted by padam View Post

The SR-Gamma Pro is indeed quite rare now (as well as any Sigma) but I see a normal bias SR-Gamma from time to time.


Doesn't help that none ever survive a visit here.  They are all scrapped for parts... redface.gif

post #22073 of 24765
Originally Posted by John Buchanan View Post

I consider myself very, very lucky to have scored an excellent condition Sigma Pro for $700. 

I am waiting for one to come up. Shippsupt had a pro on demo at the london meet and it was love at first sight. I have hd800's but these are the sound for me.
There's an nb on sale on ebay currently and it's close to $2000 with import duties. I hope it doesn't sell because if it does people will start asking for silly prices.
post #22074 of 24765

Is there any further news on the new amplifier Stax is supposedly working on?

post #22075 of 24765

My Sigma Pro's almost look like they came out of a time capsule.

post #22076 of 24765

Well there is a recent sale for the Sig Pro's from padam which looks to be sold just recently.

post #22077 of 24765

Double post.

Edited by yawg - 5/2/13 at 3:10am
post #22078 of 24765
Originally Posted by astrostar59 View Post

Hi anetode


I agree with you, I don't like quoting Wikipedia but had to as Spritzer was plucking facts about Philips and Sony back in the birth of CD standard RedBook, and making that an explanation as to why OS DACs are better than NOS DACs, along with the mis-information about ALL NOS DACs have limited HF response above 10k!


I am talking from my own ears and experience. I don't talk about what other forum posters are saying or claiming to back up my own views. I have heard and had many OS DACs over the years, and expensive models from Meridian and Naim plus others. I have found the Audio Note NOS tubed DACs sound much more realistic and natural to me. I have also talked to Peter Q at shows, and understand his research and logic for not going OS route. The NOS route is for him the most direct and accurate signal from the 44.1 data of a CD keeping it in the 16 bit domain.


On the Brickwall filter, the manufacturers struggled to make a good sounding and effective filter above 20k to the CD limit of 22.5k. That is why they were so keen on OS architecture, and also another reason why they opted for the cheaper to implement Delta Sigma chips as apposed to the superior sounding R2R chips. It also created a cool way for manufacturers to create an understandable reason for the public to buy the next x 2 or x 4 times or 8 x oversampling model each year.


The Audio Note DACs DO NOT have a brickwall filter as digital or analogue. And they use Trans on the output (like the BHSE). I don't understand all the tech but I can hear the difference myself, it is real and exciting. I have finally found a DAC I can enjoy for hours, whereas before I was ready to abandon CD all together.


I just wish more posters here would lis for themselves, then comment, not blow off with none facts and misleading info, it is bad for the hobby. BTW I noticed a recent big post on Computer Audio forum, about best DAC ever heard, and many are saying their NOS DACs are the best. It is great to know folk are going against the masses and trying these DACs out. It isn't easy, as most are tiny manufactures (Audio Note, Wavelength, MHT, 47 Labs) compared to the big guns flogging OS stuff.


I understand there are folk who have spend major dollars on DACs over the years. I did as well. But I aint mad about that, it's history, just glad I have found NOS now.


I also use an older tubed DAC, the Cayin DA-2 which I fitted with old German Siemens CCa's. I never found a better sounding DAC up to date and I like to listen to other people's systems to re-evaluate my own.


Before I found my Cayin I tried a couple of other DACs, the second best I heard was the one in my CD-player, an Arcam CD-23 which uses the ring-DAC. Great resolution but the bass is too loose because Arcam uses a chip as line stage instead of a proper class A stage like Electrocompaniet (I also owned their ECD-1) or even better a tubed output.


I found that the output stage is invariably more important than the converter chip. Even a very expensive Audio Note DAC didn't match my Cayin - that thang even had a counter to determine when it's tubes needed replacement.


A good pair of Telefunken or Siemens/Halske E88CCs will work for up to 50.000 hours ...


I tried to look up the make and model of the DAC-chip in my Cayin but after opening it found out the printing on the chip was scratched out. My technician was joking that Cayin wouldn't like me to realize they were using cheap components in their gear.

post #22079 of 24765
Originally Posted by Mad Lust Envy View Post

I know it's not a Stax, but some might be interested in my 'review' of the ESP-950.

Damn, 'very great' just doesn't sound right.

Koss ESP-950

Normally sells between $700-$1000
Review (Click to show)
Before I begin, I want to thank forum member jazzerdave for being kind enough to loan these out to me. He didn't even ask for anything in return. Stand up guy. smily_headphones1.gif

With my introduction to the electrostatic world via the SR-407 with SRM-252S amp, and it completely blowing me away sound-wise, I started looking to see what was sold new today for an affordable price range (head-fi affordable, not real world affordable, but I digress). The Koss ESP-950 immediately jumped out at me. Electrostatic headphone WITH an amp sometimes sold for less than $700? I HAD to check them out!

Koss is usually associated with headphones that are budget conscious, delivering great sound without breaking the bank. By now you guys probably know how much of a fanboy I am of the KSC-75 and KSC-35. I will always have at least one pair of Koss headphones in my lifetime. The Koss ESP-950 has been part of Koss's repertoire for a few decades, known for their incredibly linearity, well balanced, yet musical sound. The ESP-950 comes bundled with their E-90 electrostatic amp. It uses a proprietary headphone input, so it only works with the ESP-950. The great thing about Koss is that their well known Lifetime Warranty is also applicable here, so if for any reason these fail you, you can get them replaced/fixed by Koss directly. More companies should follow this type of business mindset. Standing behind their products for as long as you live!

Build Quality: Unfortunately, the build quality is without question, the worst build I have seen on a headphone costing more than $100. It literally feels like a $20 headphone to me. The internals could be made out of styrofoam, and I wouldn't doubt it.

Seriously, I don't know what it is, but electrostatic headphones seem to focus purely on sound quality, and not build or aesthetics (at least until you hit flagship level Stax headphones).

Starting with the cups, they seem to be the best area of the ESP-950's build. The grills look decent enough, and feel solid enough. It's all plastic, and not a very good feeling plastic at that. Seriously, it feels like this kind of plastic belongs on no name brand budget cans. The extension bars seem to be the only thing made out of metal, and yet, it still feels/looks a bit too thin for my personal taste. Unfortunately, the arms don't like to stay at the length you adjust them to, and I can almost guarantee that it will set itself a bit more loose than anyone may like. That is, unless you have a gargantuan head and wear these fully extended. The headband is made of some cheap feeling pleather that could stand to be a little more dense inside, but is ultimately quite comfortable, as the headphone is so light and loose, the headband feels like it practically just rests there.

The pads? Oh, the pads. They are made of incredibly cheap feeling pleather of the WORST kind. Seriously, pick out an extremely cheap over ear headphone, and I'm sure the pleather pads would be comparable to the ones on the ESP-950. Despite my absolute hate for these kinds of pads, they are actually not uncomfortable by any mean of the word. Due to how loose the ESP-950 clamps to the head, the pads don't really put much pressure on the skin, so it doesn't induce much if any sweat.

The cable is of the standard flat, ribbon-type cabling found on most if not all electrostatic headphones I have seen. This is a good thing. This basically guarantees no accidental tangling. It's a bit short of length, though it comes with an extension cable of decent length. Unless you sit right next to the amp, you're guaranteed to use the extension cable.

Now, I'm not sure if it's a build issue or just typical of electrostatics (didn't hear it on the SR-407), but the ESP-950 retains some static noise even if unpluged. You literally have to touch the contacts at the end of the cable to make the noise dissipate.

Comfort: As mentioned before, the ESP-950 is incredibly lightweight, and incredibly loose fitting (think AD700 type looseness). While the comfort overall is pretty good, the lack of secure fit makes it a little less pleasing than it should've been. The headband is very comfy, and the pleather pads, while of horrible quality, is a non-issue due to the loose fit.

Accessories: The ESP-950 comes in a very, very nice 'leather' bag, used to fit the headphone, the amp, a battery pack (without batteries) to allow the E-90 to be used on the go, a pair of RCA cables, and 3.5mm cables. If only they spent less time with accessories, and more time with the build quality of the headphone itself, but that's just a personal gripe.

Isolation/Leakage: As expected on open and electrostatic headphones, there is absolutely no isolation or passive noise cancelling. These are not to be used where noise control is important.

Sound: So to the meat of the review. As advertised, the ESP-950 is certainly a very linear, very balanced, and very well behaved headphone. These are among the flattest sounding headphones I have heard, where nothing really sticks out over anything else. The upper and lower ends are slightly rolled off, meaning there is no direct bass energy or treble sizzle. The sound as a whole was indeed quite neutral, with a hint of warmth. There is a very good sense of space and soundstage is decent, but not a stand out over what I've reviewed so far. The ESP-950 is soft sounding, a hint laid back, and polite overall. It's quite the contrast compared to the SR-407 which was quite fast, lively, energetic, and aggressive, while maintaing some amazing clarity and refinement. That's not to say the ESP-950 is muted or lacking in clarity. On the contrary. The ESP-950 is among the most detailed headphones I have ever heard. It's most evident during gaming, from what I experienced. The ESP-950 while not being the most musical headphone, is still very enjoyable. Not sterile/clinical, and not colored in any real way.

Bass: While the bass is slightly rolled off at the extreme lower end, it's not a steep roll off. With bass heavy music, the bass has a surprising amount of presence. It's a bit soft hitting and slow in the bass compared to the SR-407 which was very agile and punchy, but rolled off quite a bit faster. The ESP-950's bass overall is enjoyable and atmospheric, but doesn't bring immediate attention to itself. It could stand to gain a bit more speed and punch, but it doesn't 'sound' bass light by any means, just somewhat polite.

Mids: This is easily the biggest strength of the ESP-950. The slight warmth and linear frequency aside from the bass and treble roll off, ensures the mids are slightly forward and immediately engaging. Though not as sultry and intimate as the LCD2, it does have a similar organic tonal quality to it. Basically, voices sound very realistic/natural. If you have a lot of music that relies on vocals more than anything, the ESP-950 will not disappoint.

Treble: The treble is ever so slightly rolled off, but it's not veiled or muddy. It gives the ESP-950 a pleasing clarity to the upper range without any of the harshness found on headphones with more treble quantity. Among the most pleasant treble presentations I have heard. Not too rolled off, not too sparkly. It's in a good place. Trebleheads may want a clearer treble presentation, like that found on the SR-407 however. In this aspect alone, the ESP-950 takes on a more musical than realistic approach.

Soundstage: As previously mentioned, the soundstage while not being a stand out, is quite natural sounding in size. Depth isn't an exact strength, but there is an appreciable amount of width, with great instument separation.

Positioning: For gaming, the ESP-950 stepped it up with Dolby Headphone. The soundstage was a very good size, and while the depth still wasn't amazing, it was pretty easy to poinpoint directional cues. Space between direction cues was very good, allowing for no confusion or distractions.

Clarity: Again, like the HD650 and LCD2, the ESP-950 is slightly on the warmer side of neutral, yet like the other two, clarity for gaming was very, very impressive. Actually, if the soundstage was larger, and depth was better, these may have been right up there with the AKG K70x's in terms of god mode inducing clarity and performance. If I had to rate the clarity for gaming alone, it'd be an easy 9.

Amping: A non-issue as the ESP-950 comes with it's own amp, though people do take the extension cable and mod it to allow the ESP-950 to be used with more robust Stax amps. In any case, the E-90 drives the ESP-950 quite decently based on what I'm hearing, though the amp's volume control is an absolute pain as each side has it's own independent volume control, so you'll have to match by ear. To get around having to constantly re-adjust with different sources, I set it once, and controlled the volume with my Compass-2 (used it as a pre-amp). In terms of gaming, Mixamp owners will probably want to set the volume once (on a high decibel level) and adjust volume with the Mixamp (or other DH devices). The E-90 is also not the quietest amp, with some very slight background noise that occurs randomly.

Value: The prices fluctuate wildly, but if you can score them near the $700 range, they are an incredible value. Electrostatic headphone, amp, bag, portable battery pack. All your bases are mostly covered. The build quality doesn't not compliment it's price, however.

Final Impressions: Those looking for an incredibly well balanced, linear, and neutral-ish headphone, may find the ESP-950 to be a serious contender for your money. The ESP-950 favors it's balance and faithful representation of sound over musicality, but it remains a fine bridge between the two. For gaming, it is among the best for competitive gaming with very few faults, and it's full sound makes it a very good headphone outside of non-competitive use.

Final Scores...

Fun: 7.75 (Very Good.)

Competitive: 8.5 (Very Great)

Comfort: 7 (Good. While it's incredibly lightweight, and very inoffensive, it just doesn't clamp enough. It's incredibly loose fitting, and there is no real secure 'seal' around the ears. )




Do your self a favour and get a Stax T1 for your ESP-950, truly made a big difference in all areas for me. You will of course have to make or modify your existing cable but it's well worth it.


My ESP-950 frequently exhibited the high pitched whine that many have experianced when partnered with the E-90 amp but since I made the move to the T1 that has stopped as well.    

post #22080 of 24765
Originally Posted by spritzer View Post


Doesn't help that none ever survive a visit here.  They are all scrapped for parts... redface.gif

I got one specifically for that purpose, but decided against it in the end. They are very light and are quite comfortable to wear in the summer.

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