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Orthodynamic Roundup - Page 1419

post #21271 of 23454
Quote:
Originally Posted by wualta View Post

Without going back to the Yamaha drawings to check, it looks good to me. Did you find a source of magnets like that?

 

 

Looks pretty ravagey to me. Now we know it's a pleated diaphragm, so thanks for doing that. As for why HOK (and others) sometimes made drivers where the holes lined up perfectly and sometimes not, I don't know. Since you said you notice a change in the sound with a slight alignment, I was thinking hey, maybe they're doing it to tweak the FR of drivers so they match more closely, but that sounds too crazy to be true.

 

Oh, and it has occurred to me that if Royer can make powered ribbon mics and KRK and Prodipe can make powered speakers, why not powered headphones with motional feedback and dedicated EQ and the whole works?

Well er, um, size springs leapingly to mind. Not too sure I'd like to go back to the 70's with massive cans with knobs and geegaws sticking out all over:)

 

Allthough an amp the size of an e5 should be easy enough to integrate. Then again you have any add on's dictating the size and shape of your acoustics (think wireless headphones.....eek).

 

On the lined up magnet hole issue. I would be surprised if there was the level of hand made production involved which would allow for various alignment adjustments. I would think that would be cost prohibitive

post #21272 of 23454
Here's one I've been meaning to toss out. Has anyone considered driving a tensioned ribbon in a headphone enclosure with one of those little Dayton Audio Tactile Transducers? http://www.parts-express.com/pe/showdetl.cfm?partnumber=240-610 This thing has a wicked freq resp range. I am thinking along the terms of a drive rod in the same way a balanced armature works. In an enclosed space like a headphone cup you ought to be able to get up to some pretty good mischef.
Edited by Hutnicks - 3/6/13 at 6:34pm
post #21273 of 23454

just looked at my HOK80 drivers and a similar thing no lined up holes, or very few and those that are are simply random. I needed to clean up the old build on them because the window putty i used seems to not like copper, as in it turns it blue fast.

 Also have to add some additional Arctic Cotton layer to bump up some highs. Other than that i was surprised at what they had going on, at least with this build anyhow.

 

Open rears and stock headset.

 

I'll see about using an LED flashlight now to triple check the alignments/lack thereof ( yes completely off one had some outer holes then the other had some inner holes.


Edited by nick n - 3/6/13 at 7:25pm
post #21274 of 23454
Quote:
Originally Posted by wualta View Post

Without going back to the Yamaha drawings to check, it looks good to me. Did you find a source of magnets like that?

http://www.ebay.de/itm/370765839894?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

post #21275 of 23454
Quote:
Originally Posted by wualta View Post

Looks pretty ravagey to me. Now we know it's a pleated diaphragm, so thanks for doing that. As for why HOK (and others) sometimes made drivers where the holes lined up perfectly and sometimes not, I don't know. Since you said you notice a change in the sound with a slight alignment, I was thinking hey, maybe they're doing it to tweak the FR of drivers so they match more closely, but that sounds too crazy to be true.

 

Given that the paper slip mod (i.e. covering a certain part of the driver's front surface) improved the sound, I think it's time now to start sealing up individual holes to find out which configuration works best... Curiously, though, the paper slip mod seemed to work the same for both drivers even though their magnets aren't aligned in the same way.

 

Quote:
Originally Posted by nick n View Post

just looked at my HOK80 drivers and a similar thing no lined up holes, or very few and those that are are simply random.

 

I wonder how they're aligned on the second version HOK?


Edited by vid - 3/7/13 at 3:17am
post #21276 of 23454
Thread Starter 

MuZo2: Might work, at that. Let us know.

post #21277 of 23454

Was it someone in here who grabbed the spanky N.O.S. TDS-15 yesterday?  Looked like it even had different coloured mesh over the ears, blue and red tinged, hadn't seem that before. The pictures of it, I sat there staring for about 5 minutes just so nice looking.

 

edit:  guilty party has been uncovered :)


Edited by nick n - 3/8/13 at 9:09pm
post #21278 of 23454

^ What's with this hiding of names?

post #21279 of 23454

 

 

Yamaha HP-3 stock FR & other plots

post #21280 of 23454

Cool. Do you measure with an ear or ear canal, i.e. do you apply HRTF?

 

Also, do the phones really take that much of a dip in the treble? And do they really have no bass hump stock?

post #21281 of 23454

That's a nice looking plot. Really good bottom extension, and there's that flat ortho magic region in the middle. The dip at 2kHz on the csd is practically caving in on itself... cancelling node of some sort? The ringing at 3-4kHz could probably be damped out rather easily. 

post #21282 of 23454
Quote:
Originally Posted by vid View Post

Cool. Do you measure with an ear or ear canal, i.e. do you apply HRTF?

 

Also, do the phones really take that much of a dip in the treble? And do they really have no bass hump stock?


The measurements are without ear canal. 

 

Quote:
Originally Posted by MuZo2 View Post

 

Highs- I think the highs are bit rolled off, I would have liked bit more sparkle.

This is what my impressions were before I took measurement , so yes there is dip in treble.

post #21283 of 23454

I wonder, do you know for sure they're stock, i.e. have you had a look inside the cups? I'm assuming you have, but still.

post #21284 of 23454

| would be enormously curious to see what effect running an EQ like Electi Q on those would have. Particularly on the 2k dip.
 

post #21285 of 23454

Related to that, I did modding by EQ - though convolution rather than manual - on the HP-50 a while back. http://www.head-fi.org/t/111193/orthodynamic-roundup/20625#post_8801594. The left channel was modded by the conventional methods of felt etc., while the right channel was stock and had a convolution filter created from the left channel applied to it. The result: perfectly identical channels. In other words, modding by EQ was much like modding physically.

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