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The Stax Thread III - Page 132

post #1966 of 5133
Justin has them as "in stock" at headamp.
That's where I bought mine from.
post #1967 of 5133

He told me it would be about 4-5 month wait for mine...maybe this has changed??

post #1968 of 5133
I dont have them

I dont know what is going on with stax in north america. I just order and wait

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post #1969 of 5133
Quote:
 
Quote:
Originally Posted by AnakChan View Post
 

I think Stax just finished a batch. I noticed that Fuiya Avic actually had them in stock too rather than just order.

Originally Posted by bearFNF View Post
 

He told me it would be about 4-5 month wait for mine...maybe this has changed??

 

I think they sell out pretty quick. I posted less than 24 hrs ago that Fujiya had SR-009s in stock. Checking now, it says "Sold Out". I'd guess it's the same story overseas too.

post #1970 of 5133
Quote:
Originally Posted by AnakChan View Post

I think they sell out pretty quick. I posted less than 24 hrs ago that Fujiya had SR-009s in stock. Checking now, it says "Sold Out". I'd guess it's the same story overseas too.

Really? They sell out that fast?
I shouldn't have a problem to buy one during the festival in May, should I?

If you don't mind, I'd like to PM you closer to the date to get some tips on that.
post #1971 of 5133
I wouldn't bet much on you being able to pick up some 009 on the way back home though. Reserving before hand would be a more reasonable bet...
post #1972 of 5133

Pretty much what Arnaud said.

 

So today I popped by Stax with another HF member on visit to Tokyo and we did see that SR-009 in the glass cabinet. It was wrapped up and there was a sticker on which I believe says it's reserved.

 

I'm going to speculate that most likely Fujiya had quite a few pre-ordered and when the batch came in, they had a spare or someone cancelled their order and put that up on their web page a day back. However Fujiya also tweets whenever they have something special like that available so any followers who are interested would probably call them and order them quickly.

post #1973 of 5133
Thanks guys.
I'll call Fujiya and see how it goes.
Any other stores I should check?

I'm sure reserving and maybe paying for that over the phone will be quite challenging, considering I don't speak Japanese...
post #1974 of 5133

You're not gonna have much luck if you can't speak Japanese and if you're not local. These places are for local Japanese customers only. You could try Price Japan but be warned about warranty, etc. (go back a few pages or search for "warranty" on this thread and you may get a few hits).

post #1975 of 5133
I thought so...
I'll see if a good friend can do something about it. I'm staying in Tokyo for 3 weeks, so I'll search for it on the very first days and reserve in case I don't find any.

Thanks again for your inputs!
post #1976 of 5133
Quote:
Originally Posted by milosz View Post

With a HEADPHONE AMP designed to drive electrostatic headphones I doubt you'd see much variance of output vs. frequency.  Headphones of all types - including electrostatic- don't have anywhere near the impedance excursions that speakers exhibit.  So "tube sound" in an electrostatic headphone amplifier is more likely a result of harmonic distortion "flavor" than of frequency response variance.  All amplifiers distort, and tube amps tend to have a lower amount of high-order harmonics in their distortion products than solid state amps, many people attribute the 

tube sound" in part to this fact.

 

By the way, using a given set of speakers with a given tube amp can end up with less than great sound, for reasons noted above. The resulting frequency response might be pretty funky, matching speaker to amp can be hit-or-miss.  But I also heard a pairing which made the speakers sound GREAT>  unexpectedly so. Kind of a roundabout way to add an EQ curve to your playback chain, but the frequency-response artifact introduced by some tube amps can compliment certain speakers.  I put a pair of little Polk RT25i on a budget Audioromy FU29 tube amp and I could not believe how great it sounded.  The Audioromy FU-29 is a pretty decent low-cost amp, about 25 class-A watts per channel, and the RT25i's  are known to be great little budget  speakers but the combination really sounded so much better than I expected that I had to have some musician friends come over to make sure I wasn't imagining things or having a flashback to the 1960's.  They also agreed that the sound was pretty wonderful on the RT25i's with the tube amp, except the bass - already pretty light from the Polk's 5-inch woofers - was really kind of "mellowed out" with the tube amp, and not very "tight."  It didn't sound wooly or flabby, just lacked much punch below 60 Hz and had a little extra warmth around 200 Hz.  Still the mids and treble were just wonderful.  So, "tube magic" isn't about how inherently GOOD a tube amp is, it's more about how nicely it can WORK with the right speakers. 

Of course, I was responding directly to the allegation that transistor amplifiers were subject to greater flaws than valve designs. That is not the case.

 

I don't believe in the approach within your last paragraph because it subjects your signal to the element of randomness when a linear and transparent alternative solution (before the transducers) might be readily available.


Edited by 3X0 - 4/6/14 at 12:11pm
post #1977 of 5133
Quote:
Originally Posted by milosz View Post
 

 

Those wide deviations from flat frequency response of tube amps come from interactions of their output transformer / output stage / amount of negative feedback employed with the impedance variations in speakers.   These particular curves look like the kind of "simulated 3-way speaker load" curves that Stereophile runs.  Depending on the design, one tube amp will have greater or lesser "sensitivty" to speaker impedance than others.  It mostly comes down to Ohms-law kind of interaction between the source impedance of the tube amp and the impedance curve of the speaker.  Speakers have crossovers,  lots of drivers and so on, their impedance-vs-frequency curves can be pretty hairy.  And remember impedance is a vector quantity, not scalar....

 

(...)

 

We may have better transducers in the long run to ease the load of the amplifier. Maybe we would not need even stators, reducing reflections. Have a look at this research on a thermoacoustic transducer:

 

Quote:
Flexible, Stretchable, Transparent Carbon Nanotube Thin Film Loudspeakers
 
Most of the loudspeakers used today consist at least of a cone, a voice coil attached to the apex of the cone, a permanent magnet fixed to the loudspeaker’s frame, and an enclosure. By applying an audio current waveform to the nanotube (CNT) thin film could be a practical magnet-free loudspeaker simply by applying an audio frequency current through it. This CNT thin film loudspeaker can generate sound with wide frequency range, high sound pressure level (SPL), and low total harmonic distortion (THD). The nanothickness CNT thin films we used are flexible, stretchable, and transparent and can be tailored into many shapes and sizes, freestanding or placed on a variety of rigid or flexible insulating surfaces. Furthermore, the CNT thin film loudspeaker has a very simple structure, without magnets and moving parts. Such a single-element thin film loudspeaker might open up new applications of and approaches to manufacturing loudspeakers and other acoustic devices.
 
(...) The ac impedance of a CNT thin film is pure resistance and shows no frequency dependence within 1 MHz.
 
(...)
 

Edited by jgazal - 4/6/14 at 12:16pm
post #1978 of 5133

Thermoacoustic speakers aren't high fidelity. However, electrostatically driven graphene has already demonstrated excellent acoustic performance. Methods to low cost / high quality graphene is an enormous topic, but the material is readily applicable to Stax, and proposes to improve their products.

 

On the other hand, the availability of $1000 voice coil headphones suggests a general disinterest in science on behalf of users, right?


Edited by dripf - 4/6/14 at 1:28pm
post #1979 of 5133
Quote:
Originally Posted by dripf View Post
 

Thermoacoustic speakers aren't high fidelity. However, electrostatically driven graphene has already demonstrated excellent acoustic performance. Methods to low cost / high quality graphene is an enormous topic, but the material is readily applicable to Stax, and proposes to improve their products.

 

Would you please point me thermo acoustic speakers available for purchase?

 

I see the electrostatically graphene you mentioned: http://www.physics.berkeley.edu/research/zettl/projects/graphene_loudspeaker/speaker.html. Which is the thickness of that graphene diaphragm? Is it a single layer graphene or it has a substrate? If it is not a single layer graphene, how graphene in a substrate would differ in quality from mylar?

 

Would you point me where to buy similar single layer graphene or a graphene in a substrate sheets to made larger diameter diaphragms (i.e. a diaphragm for the SR-003 or SR-009)?

 

I think consumers were not concerned about teflon or lithium until they realized their utility.


Edited by jgazal - 4/6/14 at 1:50pm
post #1980 of 5133

You can get graphene sheets here, although they seem to be a minimum of 25um thick, which is far too thick for an electrostatic driver. Also, graphene is conductive which seems to me to make it a fairly bad electrostatic diaphragm material. The demos on electrostatic graphene drivers thus far has been extremely small sized drivers, nothing like stax headphones.

 

https://graphene-supermarket.com/Graphene-Coatings/

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