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Orthodynamic Roundup - Page 1392

post #20866 of 23372
Thread Starter 

I'm not too worried about pressure equalization, though I agree, the pressure (and by extension, frequency response) is the same over the whole diaphragm, back and front. I'm more worried about another layer of reflective surfaces bouncing stuff around more. But meh. It's easily chopped out, and the driver is well protected anyway, which means it's redundant on top of everything else. Annoying to the OCD part of the brain, but Mostly Harmless. In any case, Fostex eliminated the grille in the v2, which I suspect is what we're looking at in Congo5's top photo.

post #20867 of 23372
I would not mind any variations in the acoustic front in the mm region, because the wavelenght of 20kHz is 1.7cm. As long as there is no disturbance or any obstacle to the free flow this should have a neglectible influence.
post #20868 of 23372
Thread Starter 

Off topic, but this does represent another way to move air and thus another way to produce sound, aside from the cooling function.

 

http://www.genewscenter.com/Press-Releases/GE-Cooling-Technology-As-Thin-As-A-Credit-Card-Enables-Ultra-thin-Tablets-Laptops-3cf6.aspx

 

And once again it's look-ma-no-magnets, piezo to the rescue.

post #20869 of 23372

 

 

"The turbulent air flow of the DCJ increases the heat transfer rate to more than ten times that of natural convection."

 

I wonder to how many times that of natural convection a fan increases the heat transfer rate. 100?

post #20870 of 23372

I suppose the air-motion-transformer/Heil speakers are somewhat related... http://en.wikipedia.org/wiki/Air_Motion_Transformer

post #20871 of 23372
Thread Starter 

This appears to be a ducted piezo fan, and the blade simply waves back and forth at high speed, so it doesn't look like it makes use of the "clapping" motion of the Heil invention, although no reason why it couldn't down the road.

 

Air motion in the piezo fan is from the high-speed vortices (miniature tornados) being shed from the leading edge.  Make a headphone out of it and you could give it a cool name like VortexaPhone. The engineering problem is figuring out how to modulate what in electrical terms would be a noisy DC power source.

 

Here's a Boeing patent that may or may not be of interest: http://www.google.com/patents/US4834619

post #20872 of 23372

sorry for a dumb question - therefore even more offtopic - but what is the advantage to the devices that had a hype 5 years ago, from murato for example?
 

post #20873 of 23372

update to the HP-1 mods:

new earpads made of fine goatskin with visco foam:

700

made the hole smaller than the original (for comparison on the left side of the picture) and got a better seal to the ears and the sound is more involving and direct - like it very much!

post #20874 of 23372

Got down to it and fixed my Grundigs this cold Saturday. Basically copied Ludoo's and gurubhai's damping scheme, very simple.

 

In its present state the GDHS223 sounded bland and lifeless, no doubt because the only damping, a foam disc, had turned into goo and crumbles.

 

1000

 

 

First a clean-up to get rid of all the debris.

 

1000

 

 

Then a disc of felt (Ludoo's 1 mm Brookmore wool).

 

1000

 

 

A similarly shaped piece of foam.

 

1000

 

 

Some double sided tape.

 

1000

 

 

And finally another pice of foam, I used two layers since the foam was quite thin, and some blutak on the baffle for mass damping.

 

1000

 

 

Initial results are very promising - it sounds excellent and goes to show what a little damping can do. It's balanced throughout the frequency range with good dynamics and air too. Will leave it like this for a while to let it settle before I decide if further steps might be beneficial. Cleaned the rest of the headphone as well - the pads and headband were in quite good condition and it's very comfortable to wear.

 

1000


Edited by MDR30 - 12/15/12 at 3:15pm
post #20875 of 23372
Quote:
Originally Posted by MDR30 View Post

Got down to it and fixed my Grundigs this cold Saturday. Basically copied Ludoo's and gurubhai's damping scheme, very simple.

 

In its present state the GDHS223 sounded bland and lifeless, no doubt because the only damping, a foam disc, had turned into goo and crumbles.

 

1000

 

 

 

 

At first I thought you were going to be using hair for damping... then I realized it was just a picture underneath.

 

So while we're on the topic of weird, has anyone tried hair? After all... it's thin, organic, a good insulator... rolleyes.gif

post #20876 of 23372
Quote:
Originally Posted by Armaegis View Post

At first I thought you were going to be using hair for damping... then I realized it was just a picture underneath.

So while we're on the topic of weird, has anyone tried hair? After all... it's thin, organic, a good insulator... rolleyes.gif
Haha, glad I'm not the only one that thought that.

Hair? I'm sure having hair sticking out of vents will not look appealing redface.gif
post #20877 of 23372

Well, maybe put them in a little nylon baggie or something rolleyes.gif

post #20878 of 23372
I'll just throw this in here and come back to check after my exams:



Would anyone be able to teach me how to take these apart? I don't know how to remove the driver unit from the cups and these need a complete recabling otherwise unusable =/
It's one of those non-foldable TDS-15. The drivers and cups should be identical to the folding variant.
post #20879 of 23372

why can I see through the middle of the metal retaining plate there, is that how they came? Is there even magnets or a diaphragm in there? yikes I need to know!

 

 

http://wiki.faust3d.com/wiki/index.php?title=Image:TDS15_Drivers.jpg

 

http://www.head-fi.org/t/111193/orthodynamic-roundup/990#post_3232672

 

I hope it is just the lighting in your picture.

 

khbaur had his set apart one time he would know how to do it properly.


Edited by nick n - 12/17/12 at 6:26pm
post #20880 of 23372

Yeah it should be the lighting. The stuff between the plates are none other than the diaphragm, whose detail cannot be seen due to poor lighting conditions in the picture.

This view = the one on the left in the first link you posted. Magnets seem to be on the back side (right one in the picture). The magnets on this side are parallel to the metal plate

Though from that picture it doesn't seem like the back side would help me much in soldering, except to fit new cables.

 

:S I'll worry about this in 2 days.

 

*edited for corrections*


Edited by kalbee - 12/18/12 at 10:19am
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