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Orthodynamic Roundup - Page 1257

post #18841 of 19957
Thread Starter 

     Quote:

Originally Posted by vid View Post

1 ) Hey, the HOKs don't look pathetic! They're working class rugged, looking as they sound.

 

2 ) I trust your more experienced ear when it comes to the treble hump – or klarheit – in long-time use. (Do I sense contempt in that post towards klarheit?) I've taken a few moments to slightly tone down my own treble hump.

 

3 ) I looked up the response curve of the MD 421 – it looks just like the Terhardt outer ear curve. Any connection?


1 ) Har!  Pathetic in the "poor little lost puppy" sense. When you open the box and see the exploded earpads, your first thought is "This headphone neeeds me!", and, well, you can't say it doesn't. I have a theory about this, which I will now dump on you.This feeling is a driving emotion which I believe partly underlies the motivation of the engineering mind. My father, a brilliant mechanical engineer, would regularly bring home pathetic appliances, radios and the like, because, I am certain, he could tell, almost by a sixth sense, that they were badly made, poor things, wasn't their fault, and we would not kick them into the gutter, but would give them a loving home. He liked dogs, too.

 

2 ) If it's done nothing else, teh intarnet has done two things for us as humans: One, made it far too easy for millions of people to reach into the muckpool of their lives and spew random, unfocused contempt, and two, made it far more likely that normal people will sense contempt where none exists. Given the loud ostinato omnipresence of the first group, can we blame the second group for a little oversensitivity? No. Which is a very long way of saying, no, I don't hold frequency response curves in contempt. They're either useful or educational.

 

3 ) Terhardt's paper (if I've got the correct one) came out about 10 years after the 421 mic and the HD 414 headphone, so it most likely was influenced by ideas flying around Germany for many years. Whether specifically Sennheiser research/ideas, I don't know. You'll see that same basic shape in a lot of microphone curves.

 

Oh! Almost forgot-- You should, like, get in touch with Tyll (and wouldn't that make a great morning cable-TV show? In Touch-- with Tyll ) and, like, compare notes on Headphone Measurement comma Pitfalls Of. As long as you're measuring for you, you can establish a baseline and watch the 'phones change as you work on them. Over time you'll learn ways to control ambient noise and other distractions and increase your ability to get repeatable results... and then you can become the eastern headphone measurement guru to whom everyone sends their headphones. If you want to.


Edited by wualta - 2/6/12 at 3:46pm

Gear mentioned in this thread:

post #18842 of 19957

I wouldn't want to bother Tyll too much with my green questions, at least not yet. I'm learning lots from him as it is, though; his Building a Headphone Measurement Lab was interesting, as are his graphs and analyses.

 

(And while looking at his graphs – raw vs. compensated – I've become pretty sure that the way I apply the HRTF is wrong. Apparently it isn't EQ'd in, but simply subtracted 1:1. When I EQ in the HRTF, the bottom end gets lifted up, but you don't see that happening in any of Tyll's graphs. In fact what I seem to see in them is that energy simply vanishes as he applies the HRTF, i.e. it would be a straightforward x - y dB thing. Or so it seems.)

 

I don't know much about microphones, so I was a bit naive there about the MD 421. Thanks for looking it up.

 

(I'll admit to enjoying the feeling of cleaning up old headphones and having them look fresh and new despite their not really being so.)

post #18843 of 19957

Does anyone have extra Fostex damping foams or the stock white diaper/paper from a T20v2 (from the back of the driver)?  I'm happy to pay for them, it would save me having to track down a pair just for the damping.  And I bet some of ya'll don't use them or have removed them. 

 

I can also trade...

post #18844 of 19957

Also, potential good deal on some nice earpads... http://www.head-fi.org/t/594575/dt880-250-ohm-05-w-jmoney-pads

post #18845 of 19957
Quote:
Originally Posted by rhythmdevils View Post

Does anyone have extra Fostex damping foams or the stock white diaper/paper from a T20v2 (from the back of the driver)?  I'm happy to pay for them, it would save me having to track down a pair just for the damping.  And I bet some of ya'll don't use them or have removed them. 

 

I can also trade...


 

I have T20 (don't know the version), but I love this sound (even more than T50).

So I don't wanna separate the parts, sorry.frown.gif

post #18846 of 19957
Thread Starter 

RD: I wonder if there are some porous grades of Tyvek or similar nonwovens that are hiding under our noses in hardware stores and the like. "Diaper" material in bulk, in other words, like maybe some grades of lab filter paper.

 

Or maybe the filters used in my AeroPress: http://aerobie.com/images/filters.jpg  Not the same as drip grind filters, since the 'Press brews under pressure, so the holes are smaller. I don't know how this filter paper compares in porosity to the Fostex "diapers", but at least it's available and cheap. 62mm diameter.

 

Turns out there's a $15 permanent filter for the 'Press that might be useful for folks doing experiments: http://www.marco.org/media/2012/01/aeropress-stainless-steel-disk.jpg


Edited by wualta - 2/9/12 at 3:03pm
post #18847 of 19957

Anybody interested in laser-cut baffles to properly fit SFI drivers to the cheap and readily available Sony MDR-ZX100?

 

136635.jpeg

 

I found a pair of 32ohm SFIs in a drawer, and thought of doing a proper job this time as these are my last pair and there aren't many to be found nowadays. So I bought the ZX100 since they are cheap, and every store carries them so the final product can be easily replicated if it's any good (Yamaha's rh5-ma would have been better as they are better built, better looking and more comfortable, but they cost too much).

 

The only problem with the ZX100 is their driver is too small (30mm vs almost 39 for the SFI driver), so quite a bit of surgery is required on the baffle to make a fit, and the result will be messy. The Sony baffles are also full of holes and don't seal properly with the cups, so I though about making replacement baffles.

 

What I'll be doing is draw simple baffles to be laser cut on plexiglass.My initial idea is to have them composed of two parts: a 2mm thick disc for the baffle proper with a center hole the right size for the SFI driver and two small holes for the screws, and a thinner disc of a smaller diameter and thickness to be glued on top of that, with a smaller center hole which leaves 1mm all around to act as a stopper for the driver. The idea is to have the driver as near as the ear as possible, and to eliminate all holes and spaces between baffle and cup (the pads will need to be glued on the baffle like on the HP1 etc.).

 

I will send the drawings to the cutter this weekend to be cut, and since each sheet holds 4 or 6 pieces and I only need 2, if anybody is interested I might sell the remaining ones at cost (a few euros, plus postage). I can also make more if needed or share the (very simple) drawings. If everything works well, I'll also have some replica Fostex T20 badges made as mines are missing them, and maybe experiment with wooden cups made of laser-cut discs glued together, and/or rear cup designs with engravings and tuned bass ports.

 

Oh, and the search engine is indexing again, I fixed it yesterday.


Edited by ludoo - 2/10/12 at 5:35am
post #18848 of 19957
Thread Starter 

A hearty Yaaaay! to all of the above, the idea, the offer and the search engine. Exclamation marks all around.

 

Oh-- I just saw Tyll Hertsens' latest blog entry wherein he and a bunch of hard-headed orthonauts are really bearing down on the Neo Ortho driver-variability problem and the related measurement-repeatability problem. Good reading.


Edited by wualta - 2/10/12 at 10:17am
post #18849 of 19957
Quote:
Originally Posted by wualta View Post

A hearty Yaaaay! to all of the above, the idea, the offer and the search engine. Exclamation marks all around.

 

Oh-- I just saw Tyll Hertsens' latest blog entry wherein he and a bunch of hard-headed orthonauts are really bearing down on the Neo Ortho driver-variability problem and the related measurement-repeatability problem. Good reading.


Hah, I hope it's a project I'll be able to finish soon, and not end up in one of the many closets full of junk (lenses, cameras, headphones, amps) I have. :)

 

As for Tyll's blog, interesting article though spending 2k for headphones is something I'll never do.

 

post #18850 of 19957
Quote:
Originally Posted by KANA View Post


 

I have T20 (don't know the version), but I love this sound (even more than T50).

So I don't wanna separate the parts, sorry.frown.gif


I wouldn't even dream of it!  I just thought I'd ask.  It'll be fun to track down a v2 again.  :-) 

 

Quote:
Originally Posted by wualta View Post

RD: I wonder if there are some porous grades of Tyvek or similar nonwovens that are hiding under our noses in hardware stores and the like. "Diaper" material in bulk, in other words, like maybe some grades of lab filter paper.

 

Or maybe the filters used in my AeroPress: http://aerobie.com/images/filters.jpg  Not the same as drip grind filters, since the 'Press brews under pressure, so the holes are smaller. I don't know how this filter paper compares in porosity to the Fostex "diapers", but at least it's available and cheap. 62mm diameter.

 

Turns out there's a $15 permanent filter for the 'Press that might be useful for folks doing experiments: http://www.marco.org/media/2012/01/aeropress-stainless-steel-disk.jpg



I think there's huge potential in the porous paper-y substance on the back of the driver.  Seems to be exactly what the driver wants, except I have very few kinds here to play with.  I tried going to an art store and looking through their handmade papers, but didn't get too far with that approach. 

 

I think some kind of industrial filter sample pack would be ideal.  My father runs a lab at Stanford and knew of something like this but that hasn't panned out yet....

post #18851 of 19957

Laser-cut baffles for the Sony are 1.50€ each including materials, from the ponoko Italian site, if I go pick them up (not too far from here, about 40min). I wonder why nobody has discovered this before. Engraving is very expensive but simple cutting is really cheap.

post #18852 of 19957
Thread Starter 

Hmm, I wonder how good lasers are at punching thousands of tiny holes of a predictable size in metal foil...?

post #18853 of 19957

Coffee filters are pretty dense. The aeropress disk and the Hario v-60 paper cone in my kitchen are both very resistant to attempts to blow through them. Oddly enough, (maybe not that odd considering the audience of this thread) I have used synthetic felt as a filter for the Aeropress when I ran out of paper filters. 

 

 

 

 

post #18854 of 19957

There is a peculiar fabric that can be found on cheap dollar store collapsible shoe holders and crummy little zip-up bags with the clear plastic fronts that may be worth looking into. You get a bunch of it for next to nothing. Have a peek around your local dollar store you'll see what I mean. It's a porous semi-transparent white fabric that looks almost dimpled.

post #18855 of 19957
Thread Starter 

 

Quote:
Originally Posted by JadeEast View Post

Coffee filters are pretty dense. The aeropress disk and the Hario v-60 paper cone in my kitchen are both very resistant to attempts to blow through them. Oddly enough, (maybe not that odd considering the audience of this thread) I have used synthetic felt as a filter for the Aeropress when I ran out of paper filters. 

An Aeropressagent is brave and thrifty and knows what to do when the filters run out. I'm trying to remember my results were when I tried drip-type coffee filters as damping layers. I thought I'd concluded they weren't dense enough, but I could be wrong.

 

I don't know what a Hario V-60 is, but it should be a headphone. Or a BMX bike.


Quote:
Originally Posted by nick n View Post

There is a peculiar fabric that can be found on cheap dollar store collapsible shoe holders and crummy little zip-up bags with the clear plastic fronts that may be worth looking into. You get a bunch of it for next to nothing. Have a peek around your local dollar store you'll see what I mean. It's a porous semi-transparent white fabric that looks almost dimpled.

Trying to picture it.. is it about the same weave and thickness as dryer sheets?
 

 


Edited by wualta - 2/10/12 at 11:02pm
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