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Oppo PM-1: A New Planar Magnetic Headphone! - Page 18

post #256 of 2548

Those swivel hinges look extremely fragile...

post #257 of 2548
Quote:
Originally Posted by takato14 View Post
 

I'm sorry, but this is just plain innacurate. Planarmagnetic transducers push air particles forward to produce a sound wave. The membrane of an electrostat is lighter than air, therefore it cannot push or move it, it instead excites the particles to create noise, aptly named the electrostatic effect. This is why stats are mostly devoid of impact by default when compared to dynamic transducers. 

 

But I thought that the wall of sound effect is because it literally is a wall of sound-- the driver is just a big flat wall of substrate pressed up against your ears, with a mostly solid enclosure, and no open space on the sides of the driver.

 

Please tell me what is the density of polyethylene terephthalate and a mixture of nitrogen/oxigen by 71/29% at room temperature and regular atmospheric pressure.

 

Extra question - how much mylar (units of mass) would one need to put in a an electrostatic headphone so that it wouldn't need a stand anymore?

post #258 of 2548

Guys...Electrostatic drivers move the air....otherwise they would make no sound. The only thing that changes is how the diaphragm is moved. In a ortho its using the magnetism of the magnets on either side of the diaphram, and on electrostats its using the electrostatic force caused by the stationary charge on the diaphragm being pushed and pulled by the electrostatic field created by the movement of charges through the stators.

 

And no one is going to convince me that the mylar is lighter than air, otherwise it would float when not attached to the headphone...not just float, but literally get pushed up into the air...

post #259 of 2548

takaoto, I advise for your own good to do a bit more of research on how electrostatic and planar magnetic transducers work. 

 

I'll begin off to break this down for class 101:

 

Quote:
Originally Posted by takato14 View Post
 

I'm sorry, but this is just plain innacurate. Planarmagnetic transducers push air particles forward to produce a sound wave. The membrane of an electrostat is lighter than air, therefore it cannot push or move it, it instead excites the particles to create noise, aptly named the electrostatic effect. This is why stats are mostly devoid of impact by default when compared to dynamic transducers. 

 

But I thought that the wall of sound effect is because it literally is a wall of sound-- the driver is just a big flat wall of substrate pressed up against your ears, with a mostly solid enclosure, and no open space on the sides of the driver.

 

I'm not talking about the fundamentals and properties of how planar magnetic transducers work be it in headphones or speakers, what I'm implying is planar magnetics and electrostats or ESL for speakers, the technology itself behave in a similar fashion, I'm not talking about the membrane excursion point or whatsoever, that is purely common sense if you look at the broken down transducer diagrams and animation Audeze has on it's site. Planar and electrostats both have a membrane or diaphragm, planar magnetic membranes only work half charged or usually half of one side or both, the charge only works where there is a micro-strip printed on the membrane and works in conjunction with the magnets on the stators sandwiched on both sides. 

Electrostats as the name implies means that rather than have an unequal surface area charged for sound reproduction, the whole membrane/diaphragm surface is charged equally with a high vdc current, this is bias, or in other words electrostatically charged, there is no micro circuit stripes on diaphragm of a E-stat. 

Yes E-stat membranes are very thin in comparison in < 1.5microns of mylar membrane thickness for modern units, they move very little or vibrate very little but very fast in comparison to planars, but due to the complete surface area being charged, this means they can produce aspects of sound very clearly, efficiently and coherently without smearing the rest of the sound spectrum. 

Others such as chinsettawong, spritzer or other experienced folks can provide input on bias voltage/micron thickness ratios, stator thickness/size etc etc if need be.

 

As with the wall of sound comment, you have to listen to either one of the Hifiman or Audeze headphones to know what you're hearing. As far as Audeze headphones goes, great mids, bit too laid back, dominant bass region, not much treble (to my liking), mediocre soundstage on the LCD3 and pretty closed in soundstage on the LCD2. Hifiman HE-6, treble is a bit bright and shrilly at times (before those interject and say it's amplification problem, it's not as it's present in the FR chart powered by different amps), ok soundstage and imaging, good balanced bass and mids, behaves accordingly to amplification but treble remains so and so, Abyss, complete rip off, great soundstage (possibly due to distance of pads), unacceptable treble/diffused doesn't like it's there or a bit lost, great bass (but I prefer the Audeze's bass), mids are average, sound relies on fit.

post #260 of 2548

:rolleyes: ERRMYGAWDD..Enough with these technicalities. Its about how it sounds in the end.

post #261 of 2548

Electrostats make sound.  They move air. 

 

The lesser amount of impact is due to a variety of reasons, the biggest being that the max excursion is tiny...typically 0.3 - 0.5 mm in headphones, higher in speakers.  Some electrostatic headphones have more impact than others, therefore not all stats "have no impact".

 

Mylar is not lighter than air...this is a common misconception.  However, typically the diaphragm is lighter than the volume of air it can move. 

post #262 of 2548

Guys can we get back on topic about the Oppo? This has gone on for 2 pages.

post #263 of 2548
Quote:
Originally Posted by AnakChan View Post

Guys can we get back on topic about the Oppo? This has gone on for 2 pages.
+1. These PM-1s are still lookin great biggrin.gif
post #264 of 2548

But don't you guys seriously think that the hinges look way too fragile? I feel like the whole headphone looks quite fragile TBH

post #265 of 2548
Quote:
Originally Posted by Nimzerz View Post

But don't you guys seriously think that the hinges look way too fragile? I feel like the whole headphone looks quite fragile TBH
That's hard to say, especially just by looks. Once it's in your hands--I'm sure a better assumption can be made.
post #266 of 2548
Quote:
Originally Posted by Nimzerz View Post
 

But don't you guys seriously think that the hinges look way too fragile? I feel like the whole headphone looks quite fragile TBH

I think these are quite sturdy looking/built. If you want fragile, take a look at the recently released Kingsound electrostatic headphone. Look's like one of them toys you get with a Happy Meal.

post #267 of 2548
Quote:
Originally Posted by DefQon View Post
 
Look's like one of them toys you get with a Happy Meal.

lol :p 

 

 

 

What was the ohm number on the pm-1 again? I cant recall if that was mentioned in the impression notes.


Edited by DarKen23 - 10/16/13 at 12:41am
post #268 of 2548
Quote:
Originally Posted by DefQon View Post
 

I think these are quite sturdy looking/built. If you want fragile, take a look at the recently released Kingsound electrostatic headphone. Look's like one of them toys you get with a Happy Meal.

Hurt me ! :wink: I am one of those that got a pair and they are flimsy but put them on right after any planar HP and you don't feel a thing.

post #269 of 2548
Quote:
Originally Posted by FraGGleR View Post



Ah yes, the 2013 chiunifi :biggrin.gif
post #270 of 2548

This is what happens when there is so little info, on a new product....

 

Anything on a launch date (approx) and pricing (approx) and maybe power requirements, would be amazingly helpful right about now.

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