VERISONIX-IN2UIT-VERISONIC

[gr8soundz]

  Seems to have small Transformers inside each earcup.
All said, I was ready to buy multiple electrostatz models, but not until concerns are reworked & modified.
Unfamiliar with the bluetooth model posted, wish could help there.

According to Mitchell & Johnson, the transformer is self biasing and requires less than 1 Volt. Not sure this makes enough difference safety wise but a number of these headphones are already available in the US. Pretty sure the FCC (which is notorious for being overly cautious) would've rejected approval if certain limits were exceeded. 
 
I'm sure the headphones radiate levels of something just like all electronic devices. Only question is how much and what levels are dangerous long term?
 
Hell, for many years I used to check cell phone radiation measurements before buying a new phone. Still no shortage of phones available despite the debated long-term dangers of holding them so close to your head. Now I mostly use bluetooth headsets but those give off something too, just in lesser amounts.
 
Beginning to think much of this discussion should be in the sound science forums.
 

 

[luvmusik]

No intent to alarm you or anyone, actually posted about EMR much earlier in the thread without any interests. Also posted it in the related thread of electrastatz, noting EMR.
 
Now have brought up many other points in this recent post #58, being discussed, besides EMR.
 
Understand self-biasing completely (own many self-biasing systems), and that electrostatz requires < 1 volt, thus also encourage milligauss measurement, an on-topic discussion since this "new" method of an "old" transformer placement was abandoned by other electret manufacturers. 2 to 3 milligauss are reported unsafe.
 
Not sure whatsoever the FCC would be involved in this type production. Many unregulated products also arrive in the states from foreign countries. But of interest, and far less debate than years ago, is that the leading researchers of EMR do not use cell phones any longer themselves held up to their ear. At the least if needed to, they put on speaker at a distance & make call brief. That is off-topic, but in response.
 
This was not meant to debate established science. Just trying to help others out that have many years ahead of them, and my post raises many points, not one only. If someone had a serious medical consequence someday, it may have been of benefit that this was all mentioned beforehand, so folks can choose & decide if it is an important concern for them. If avoidable, they would be happy to know beforehand, and not saying that this will occur at all- it's just of interest to question due to the nature of this construction.
 
We all like to defend our headphones...I even have some that I wouldn't speak favorably about, and many others am fondly pleased with, but again, no intention to upset, just presenting information. Again, would like to buy some of these models, but hope to see some bugs worked out.
 
But the statement that "I'm sure the headphones (electrostatz) radiate levels of something just like all electronic devices" is both vague & highly false. Transformers in devices are very detrimental, and different than other devices for EMR. There is/ was a hugh list on the web on over 100 headphones and their measured EMR levels - all tested standardized. It is hard to find on the web, but some results were very surprising relatively to each other. But, none of those had transformers in the earcups.
 
Posting was not meant to discuss EMR in depth, just an awareness of these models and if their emission is signifigant. Any can make their choices, my ears are too important if any risk is posed. The ear apparatus is a very delicate structure to note.
 
So, back on topic, why not a cord-end bulge plug, even as an option...instead of in-ear transformers...issues solved, and per my previous posts on this thread & other related electrastatz threads, it could open up the cups inside cubic volume for better tuning & modding. That's a good discussion, along with many other points I've posted.

 

[Beagle]

  Seems to have small Transformers inside each earcup.
 

 
Uh oh. I'm going to listen to Lou Reed's "Transformer" through these, then I'm sending mine back to amazon.jp. I already cancelled the pending order on the IN2UIT I150.

 

[luvmusik]

Haven't completely given up on these, feel they could be a modder's delight.
 
There is potential, and there are ways to make this a better headphone series.
 
Goal would be to make the sonic picture it's best & to move further away from the oem-supply seen in all branded badges.
 
Have posted some ideas previously on the other electrastatz related threads, but not on over-hyped KS site discussion pages.
 
To start, can get down to basics, and start over top to bottom...
 
First, I would remove all the clutter out of the earcups to actually have a sound chamber. The 2 drivers & wires are there, that's it. Streamline the crossover for the tiniest footprint possible, removing transformers. Bury the crossover in a position least likely to affect wave reflection disturbances; it may even be carefully placed inside the cup, but not in the sound chamber - like inside a cutout near the circumference leaving the sound chamber intact & open.
 
Now we have something to work with sonically. The inner circumference of the cups can remain cut as is, or be cut into 5 or 8-step amphitheater tiers around inner circumference like Fischer Audio or Kennerton does to control soundwaves on some models with nice results.
 
Taking all the unnecessary crap out of cup alleviates lots of multi-reflections of backwaves & a sonic-mash of an unclear wave presentation. It now presents the situation inherent with wood sealed cups and dual drivers. Wood cups = resonance, reflection & some absorption dependent on wood type. Slight coloration of tone from tonewood chosen. Tuning most likely necessary. Dual drivers = obstruction internally leading to disruption of waves both externally in cancellation/overlap, and internally as backwave control problem. Integration of drivers for coherence, smooth transition & matching of speed (an engineering issue all hybrids face, needs extensive R & D to overcome). Dharma, oBravo, others (? future ESS amt/heil-dynamic hybrid release ?) all face this last part, and science will tell where that engineering goes for improvements.
 
At this point the discussion for skilled modders becomes interesting how they might approach tuning, measurement based tweeks & mods. Common ideas as damping the inner & outer rings, dynamat placement, etc could make a difference sonically. Tinkerers may find some unique ideas based on the dual-driver construction. Possible limitation of the internal chamber dedicated to each driver is an idea- 2 seperate internal sound chambers. (think of loudspeaker driver isolation in seperate compartments).
 
Next, all of the electronics, removed from earcups can be modified into an inline approach. Have detachable cables with a bulge-block towards the plug end, but leave it 8 inches from plug for shock pulls on cord or avoidance of stress to source jack. Terminate cord in either 1/4" or 1/8" plug to suit needs. A detachable bulge cable is a good way to go, because now most electronics can be replaced easily just by swapping a new cable. It prevents the need to open cups in future for most repairs. This also allows double use as a portable or home/studio listening application.
 
Lastly, and what IMO is best for ultimate performance in getting the most out of these sonically for strict home/studio use is to have an optional cable and external energizer-transformer box. This box would have very large transformers in it, far dwarfing the small ones that seem to be in the cups now. When the transformer quality & size is increased greatly, the magnitude of the audio quality vastly improves and will nearly get these headphones to their ultimate performance. It can take them to upper-mid-fi, but for any of these ideas, the price to buy must be low to keep it worthwhile. There are lots of great performing cans in this tier starting at $300, and competiton is fierce. If an underperformer costs too much to buy relative to better units, then it becomes outpriced in the league.
 
Still have hope, bugs could be worked out, IMO the current design-model misses the mark in construction which can limit it's audio potential capabilities.

 

[conquerator2]

Wow is the transformer really a tumor / cancer thread?
Makes me wonder... That would be a deal breaker
How is that different to oversized planarmagnetic magnets in headphones?
Isn't both non-ionizing so it should be harmless (unable to change DNA)?
I am really wondering about this.

 

[luvmusik]

Magnets in themselves pose no problem.
 
So far, traditional dynamics, planars, & true- electrostatics also pose no problem.
 
Traditional electrets with bulge-plug or seperate energizer box pose no problem.
 
Some hybrids, I think - like amt/heil-dynamic or ribbon-dynamic types (oBravo) should pose no problem.
 
Question is to have an true-indepedent EMF measurement of any in-ear cup transformer type, seen in both this "new" system and old vintage similar electrets such as some Audio Technica with in ear cup transformers, which they abandoned long ago. To also note as a transformer ages, it's emission of EMR may increase.
 
We just don't know if a health concern is at risk without measurement, but 2 to 3 milligauss has been reported to be unsafe. Also to note is any flow of current in electronics has infinitesmal amounts of EMR - simply like any wires, etc...but that is really very, very extremely  low & of no consequence.
 
The long hours of listening allows duration of emission, but the very close proximity to the ear is equally or of more concern.
 
We have yet anyone take these apart to examine transformers and if they are in every model, but some say so.
 
If an EMF reading is taken, it should be done inside earcups sealed to a dummy-head or something like towels in th middle, with music playing at normal listening levels.
If measured levels are substantial, to me, the risk is not worth it. It may or may not cause the conditions posted, but we do know high EMR with close proximity over long repeated duration of exposure can. Complication like metastasis could be a concern if so. Here we also have sealed cups of a concern for localization, that may actually make EMF easier to measure, not sure though.
 
If any diy'er wants to measure EMR with an EMF meter, proper calibration with a standard baseline reading & zero alignment are factors. Not sure where a testing standard can be found to line-up a meter. Maybe at a local college physics lab, or maybe fire department or some agency may have a standardized sample to check the meter for accurate calibration. Probably very easy with some looking into.
 
Reason I have never bought the vintage Audio Technica types with in-earcup transformers, avoiding them altogether, but have bought their traditional electrets without that configuration.
 
Not sure, but think electrastatz has been passed around a bit lately - think can still buy In2uit new in Asia now, Verisonix sells now, and soon rebadged M & J also markets.
 
Lotsa things jump on the market with concerns - off-topic (just for example) product is hoverboards - not to enter into discussion, but noted how many brands with faulty batteries have flooded the market (just an example only).
 
Regardless of measurement though, think the headphone series could be reworked per post #64, so not all is lost. Surely one day a skilled modder may do this & we welcome his sonic measurements resulting. It could create a whole new line and we could still have something worthwhile for listening.

 

[conquerator2]

Magnets in themselves pose no problem.

So far, traditional dynamics, planars, & true- electrostatics also pose no problem.

Traditional electrets with bulge-plug or seperate energizer box pose no problem.

Some hybrids, I think - like amt/heil-dynamic or ribbon-dynamic types (oBravo) should pose no problem.

Question is to have an true-indepedent EMF measurement of any in-ear cup transformer type, seen in both this "new" system and old vintage similar electrets such as some Audio Technica with in ear cup transformers, which they abandoned long ago. To also note as a transformer ages, it's emission of EMR may increase.

We just don't know if a health concern is at risk without measurement, but 2 to 3 milligauss has been reported to be unsafe. Also to note is any flow of current in electronics has infinitesmal amounts of EMR - simply like any wires, etc...but that is really very, very extremely  low & of no consequence.

The long hours of listening allows duration of emission, but the very close proximity to the ear is equally or of more concern.

We have yet anyone take these apart to examine transformers and if they are in every model, but some say so.

If an EMF reading is taken, it should be done inside earcups sealed to a dummy-head or something like towels in th middle, with music playing at normal listening levels.
If measured levels are substantial, to me, the risk is not worth it. It may or may not cause the conditions posted, but we do know high EMR with close proximity over long repeated duration of exposure can. Complication like metastasis could be a concern if so. Here we also have sealed cups of a concern for localization, that may actually make EMF easier to measure, not sure though.

If any diy'er wants to measure EMR with an EMF meter, proper calibration with a standard baseline reading & zero alignment are factors. Not sure where a testing standard can be found to line-up a meter. Maybe at a local college physics lab, or maybe fire department or some agency may have a standardized sample to check the meter for accurate calibration. Probably very easy with some looking into.

Reason I have never bought the vintage Audio Technica types with in-earcup transformers, avoiding them altogether, but have bought their traditional electrets without that configuration.

Not sure, but think electrastatz has been passed around a bit lately - think can still buy In2uit new in Asia now, Verisonix sells now, and soon rebadged M & J also markets.

Lotsa things jump on the market with concerns - off-topic (just for example) product is hoverboards - not to enter into discussion, but noted how many brands with faulty batteries have flooded the market (just an example only).

Regardless of measurement though, think the headphone series could be reworked per post #64, so not all is lost. Surely one day a skilled modder may do this & we welcome his sonic measurements resulting. It could create a whole new line and we could still have something worthwhile for listening.

Thank you! Appreciate this informative response!
So I wonder what is the difference between traditional magnet headphones and a transformer coupled ones? Are the magnetic energies much less? Magnets are still magnets. I'd love to understand this better
And as far as I know, the Dharma uses a precharged electret layer for the estat part, so does that mean it has no transformer?
Thank you

 

[luvmusik]

The traditional driver types work off the power coming in-line to them. The transformer types have that power stepped up to satisfy the need of the driver's requirement (here electret). Power is not the best word to use, but using it as a general term here.
 
The magnet at the rear of a conventional driver is a fairly standard magnet & does not contribute EMR. However, the functional nature of transformers does emit EMR - a good thing is to dive into some transformer literature to get a detailed explanation; probably easy to find on internet. High voltage transfomers do emit more EMR. Magnets & transformers are much different in energy parameters though.
 
Have been trying to find out details of Dharma, but haven't seen deep details. Maybe any Dharma threads here detail it. The head-fi "search this thread" function is cool to pull info out of many pages and zillions of posts. Would like to know Dharma's methodology. Manufacturer hasn't really gone into too much detail regarding this specific info. I'm not sure of Dharma specifics yet & wonder if they're using transformers, and if so, are they in some way heavily shielded- which may be hard inside headphones, or not feasible. Have looked at their diagrams, but they hide everything from view.
 
The precharge info means what an electret diaphragm is in description & function. An electret is an electrostatic driver. Some try to challenge that, but the detail abounds here on head-fi threads very conclusively. The gurus explain it very well, but basically all I can convey it, is as -an electret element is manufactured with a permanent charge applied to it which should last a human lifetime or more. Some early models have charge build-up (often erroneously referred to as charge loss) issues which render the diaphram expired and done. Almost all electret models last many decades with their embedded charges; 1 of the earliest electret developer engineers stated the charge should last hundreds of years (actually have saved that file somewhere for interest !) but I don't know if that is correct, possibly overstated - maybe he meant "some" (with failing) charge longevity. Electrets were made to reach a lower price point than true-electrostatics.
 
True-electrostatics are not made as permanently precharged. They receive their charge from the electrostatic-type-amplifier thru either pro-bias (580 volts), or normal-bias (230 volts) voltage, or can also be run from a loudspeaker-amp rear tap speaker-outs combined with a transformer "energizer" box - such as a Woo-Wee, mjolnar box, illusion, and some Stax units. This voltage conversion is safe, however inside the earcups, so the listener is not in any harm. Some concern is in extremely humid climates, like some island areas, with daily humidity of always >90 %, Stax literature addresses humidity. Funny, I brought the Stax humidity thing up on another thread here, and within weeks, 1 of 2 main electrastatz mfrs then included humidity on their site page description in a updated site format. I do own many Stax sets, so they are my best, a sound that works for me,along with 2 other favorite sets in a large collection.
 
Other head-fier's could explain & describe these things much better, and my words are just to convey the basic idea, but tried to help out. Hope this helps in some way.

 

[conquerator2]

The traditional driver types work off the power coming in-line to them. The transformer types have that power stepped up to satisfy the need of the driver's requirement (here electret). Power is not the best word to use, but using it as a general term here.

The magnet at the rear of a conventional driver is a fairly standard magnet & does not contribute EMR. However, the functional nature of transformers does emit EMR - a good thing is to dive into some transformer literature to get a detailed explanation; probably easy to find on internet. High voltage transfomers do emit more EMR. Magnets & transformers are much different in energy parameters though.

Have been trying to find out details of Dharma, but haven't seen deep details. Maybe any Dharma threads here detail it. The head-fi "search this thread" function is cool to pull info out of many pages and zillions of posts. Would like to know Dharma's methodology. Manufacturer hasn't really gone into too much detail regarding this specific info. I'm not sure of Dharma specifics yet & wonder if they're using transformers, and if so, are they in some way heavily shielded- which may be hard inside headphones, or not feasible. Have looked at their diagrams, but they hide everything from view.

The precharge info means what an electret diaphragm is in description & function. An electret is an electrostatic driver. Some try to challenge that, but the detail abounds here on head-fi threads very conclusively. The gurus explain it very well, but basically all I can convey it, is as -an electret element is manufactured with a permanent charge applied to it which should last a human lifetime or more. Some early models have charge build-up (often erroneously referred to as charge loss) issues which render the diaphram expired and done. Almost all electret models last many decades with their embedded charges; 1 of the earliest electret developer engineers stated the charge should last hundreds of years (actually have saved that file somewhere for interest !) but I don't know if that is correct, possibly overstated - maybe he meant "some" (with failing) charge longevity. Electrets were made to reach a lower price point than true-electrostatics.

True-electrostatics are not made as permanently precharged. They receive their charge from the electrostatic-type-amplifier thru either pro-bias (580 volts), or normal-bias (230 volts) voltage, or can also be run from a loudspeaker-amp rear tap speaker-outs combined with a transformer "energizer" box - such as a Woo-Wee, mjolnar box, illusion, and some Stax units. This voltage conversion is safe, however inside the earcups, so the listener is not in any harm. Some concern is in extremely humid climates, like some island areas, with daily humidity of always >90 %, Stax literature addresses humidity. Funny, I brought the Stax humidity thing up on another thread here, and within weeks, 1 of 2 main electrastatz mfrs then included humidity on their site page description in a updated site format. I do own many Stax sets, so they are my best, a sound that works for me,along with 2 other favorite sets in a large collection.

Other head-fier's could explain & describe these things much better, and my words are just to convey the basic idea, but tried to help out. Hope this helps in some way.

It absolutely helps! Thank you so much
So the permanently precharged electret does not need a transformer?
While the transformer ones do not hold a self sustained charge?
That is the only part where I am not sure what you meant.
Thanks again

 

[luvmusik]

Just looked up Dharma D1000 on the headphone-guru audio review & they detailed it. For Dharma - the electret element kicks in at 12,000 Hz, so it hardly covers much bandwidth upward, providing "air", spacialty, overtones, highest bells, triangles, very-hi-cymbals, etc. They said other reviews mistakenly printed the crossover at lower Hz, but Mr Wei Chang (EnigmAcoustics) states 12 KHz. Because it does not need to cover the power demands of the full bandwidth downward, the embedded precharge is sufficient to cover the far upper frequencies alone thru self-biasing (what "power" is coming in thru the cord, from source). These hi frequencies have little demand for power. Power not the best word. This is because the paper cone dynamic driver covers almost all of the entire frequency response - covers 20 to 20,000 Hz itself alone. The supertweeter effect of the electret element covers 12 to 40,000 Hz, per Mr Wei. So, Dharma does not need transformers, confirmed by 6Moons Audio also. This design is patented by EnigmAcoustics. Nice design-model.
 
The electrastatz crossover point is somewhere within 1000 Hz to 2000 Hz area, in the midrange region where much music lies. Some audiophiles are very picky where they prefer crossover points (in loudspeakers) to be, especially classical music listeners. The transition area can be incongruous between drivers, especially for strings and piano, and it is a touchy subject. Strings & piano, along with other instruments playing phrases starting at one side of the crossover & ending on the other side (think of a simple glissando) can sound disjointed thru the musical passage. It's where an instrument extends through playing across 1 driver into and thru the 2nd driver- sometimes the poor driver transition is very audible if designed badly. Probably why Dharma puts their's at a supertweeter frequency crossover.
 
So, this particular permanent charge electret, patented only in Dharma use, needs no transformer. However, ALL electrets are permanently precharged, and all need transformers or electrostatic amps to drive them, but not Dharma.
 
Probably confused the explanation & see your question. Because (exception-not Dharma now) all electrets need some extra "juice", they need a transformer somewhere, or an electrostatic amp providing upconversion in higher voltage. Almost all electrets used an external transformer box (ex: like Stax SRD-4 box, etc) to provide that extra juice. Audio Technica & maybe 1 or 2 other vintage models put small transformers in each earcup so we wouldn't need that external box - their cord terminated in a standard plug. A-T and very many other vintage brands (Philips, Toshiba, Aurex, etc), also chose another way, which was neither transformers inside cups or and external box. Those many types instead put the transformer in the six foot cable-cord as a big bulky end plug which housed the transfomer along with the plug. These plugs are about 3 or 4 inches long and 2 inches diameter - it terminates with a 1/4" male phono plug to go into headphone jack of source. Often referred to as a "bulge-plug", it allowed convenience of no external box, and also portability. So, they all needed some type of transformer or electrostatic amp to drive them. Example - Stax Sr-30 Pro electret runs off a SRD-4 external transformer "energizer" box wired to rear loudspeaker-amp speaker-out-taps. The SR-30 Pro electret can also run off any stax pro-bias (580 v) or normal bias (230v) electrostatic amp, such as a Stax SRM-1/Mk II Pro model electrostatic amp.
 
All electrets posess a permanent embedded charge at manufacturing. True-electrostatics (ex : Stax SR-Lambda Nova Signature, etc) do not. Those true-stats require the charge provided externally from a matched stat-amp, or an external "energizer" box connected to loudspeaker amp (Woo Audio Wee, Audiovalve Verto, illusion esc-1001, etc). We also refer to these "energizer" boxes as a "transformer" - because that's what's mostly inside of the box. My Woo Wee (have illusion also, just bought both used) contains heavy, massive transformers - 3 -  I believe, last time seeing nudies of the inside with cover-lid off recalling the insides. It weighs a ton - very heavy for its size.
 
So I understand your deciphering of this and any confusion. Dharma is much different with their patented design. Summary - electrets all are precharged permanently & need either transformer(s)-either as energizer box or bulge-plug, or small ones in-earcup, or stat-amp to drive. True-electrostatics have no permanent charge & need either matched stat-amp or energizer "transformer" box to drive. Sorry for confusion.
 
Dharma is different & the tiny needs of their electret kicking in at a hi 12,000 Hz needs no extra "juice" because they used a very strong permanent charge (patented) only needed for this very high-bandwidth area powering. The regular "juice" coming thru the 6 foot cable along with the music signal is enough to drive that electret well. Noted is on average a young human hears generally to about 20,000 Hz. At age 35 or 40 roughly, that avg human now has hearing capped at 14,000 Hz on average from physiologic aging - happens to almost every one of us. So Dharma electret supertweeter range of 12KHz to 40KHz is mostly for "airiness" & spacialty. At 12 KHz up, the instruments are limited -like triangles, very hi bells and tiny-hi cymbals, overtones, really high notes on violins & reeds like oboe-clarinet- plus piccolo & flute, and some other things like really hi synth notes. (think really hi, like ultra-squeaky) !
 
Maybe this all clears up what drives these elements.

 

[luvmusik]

Funny, on my very first #1 post in this thread I reached out to ask if the electrastaz were "self-biasing", (like the Dharma). Others have seen transformers in the earcups are driving the electret elements. Guessing since all electrastatz models crossover point are in 1000 to 2000 Hz area, they all are constructed with same methodology. Maybe some models use some other method, not all models are shown opened inside with complete actual photos of all components. Time will tell us.
 
Just as an aside, Stax made some self-biasing configurations - I have some of them, but will try not to confuse. Some Stax "energizer" transformer external boxes (run off loudspeaker-amps rear speaker-tap outs), used an AC wall plug for voltage in powering them up. Other Stax energizers (ex : SRD-7SB..."SB" meaning self-bias) have no AC wall plug. They are self-biased, using the "juice" from the loudspeaker-amp to drive the energizer as it upconverts to 230 volts, to drive normal-bias (230 v) Stax like SR-Lambda-Normal Bias headphones. Even some Pro-bias voltage (580v) energizer boxes were made by Stax, less made though, to function the same way, self-biasing to power up the higher voltage models like Stax SR-Lambda-Pro & many others needing the 580v conversion. So, both normal-bias 230v or pro bias 580v energizer "transformer" boxes made by Stax were available as either powered up by AC-wall plug or instead thru self-biasing (no AC-wall plug) using the source as powering. That may have been confusing, so I hope not; true-electrostatics have much involved, and it is bewildering at first, we were all there at the start.
 
Aside note - Mr Speakers is releasing an electrostatic headphone soon, since the release also of HiFiMan's Shangri-La. So, now the true-electrostatic 6 headphone makers currently are - Stax/Airbow, Sennheiser, Koss, KingSound, HiFiMan and Mr Speakers ! It's getting better every day, but who can afford the new Sennie Orpheus !?!

 

[conquerator2]

Thank you so much for those! I really appreciate the effort. It really covers everything and I now understand it.
I believe the electret driver on mine kicks in at 1-2Khz so it is true. I found a slight lack of energy in the 4-5K area (but I actually like that as I have increased sensitivity there).
I really like the sound a lot (except for what I perceive as missmatched drivers :/) but the health hazard is not worth it
Thanks again for the amazing post!

 

[conquerator2]

This is manufacturer's specs directly - http://www.verisonix.info/tech.html
It is interesting that it does not mention using amy transformers. They do not call their drivers SBSL but EFL. From all accounts though the transformer may not be true.
Verisonix also apparently owns 60% of Enigmacoustics stake and they are the ones who make the (electret?) drivers for the Dharma...
So it really makes me wonder whether they aren't complety transformerless...
Food for thought
Contacted Verisonix directly so will see if they respond.

 

[luvmusik]

Yes, I've seen the whole site & the previous site which revealed some more info, but now dropped off the updated site now. They never have revealed how they power their electrets, other members here have said they saw transformers inside earcups on some electrastatz models, I dunno, reason for the whole topic & waiting until all models are opend up. Not sure if they can self-bias a driver ranging from 1000, 2000 or 4000 Hz up. Their different models must cross at different Hz since at least 3 crossover points are listed. EFL simply means it's flexible, but they have used nano-tech in development, like HiFiMan & Sony also in the electret element development (Asian scientists from Taiwan I recall, not In2uit or Verisonix or M & J).
 
Where can we read that Verisonix owns part of EnigmAcoustics, and supplies either their electret or dynamic driver ? I would like to read that info.
 
Also, let us know what you find out from mfr...if they use transformers inside earcups or how they power the electret.
 
Have you opened yours to look & take photos ? Curious if all models operate the same way too.
 
We would welcome photos of all internal parts !

 

[luvmusik]

Also see their site says their EFL is driven by voltage, not current, which still raises the question how they are powering the electret.