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Orthodynamic Roundup - Page 1412

post #21166 of 22863
Quote:
Originally Posted by wualta View Post

You're supposed to be the grownup and make sure it doesn't "has a spike".  Once the silistor is jumpered, you can determine if the 'phone is damaged. If not, replace the silistor.


Ah mea culpa, I thought you were advocating the jumper as a permanent replacement for the silistor.

post #21167 of 22863
Quote:
Originally Posted by wualta View Post

No, there's more to it than that, and you know it.

Har.

 

I forget so easily - because my vintage PMB orthos do not sound closed-in, but they do not have head-shattering bass either....

It could have something to do with the open-back designs though, come to think of it....

post #21168 of 22863
Thread Starter 
Quote:
Originally Posted by DefectiveAudioComponent View Post

 

I forget so easily - because my vintage PMB orthos do not sound closed-in, but they do not have head-shattering bass either....

It could have something to do with the open-back designs though, come to think of it....

Sure. Open-back is especially risky. It means you have to get the [preferably large] diaphragm right up on the ear, or else have really really good sealing and density in your pads. An extreme case would be the oil-filled pads Koss and Sharpe used back in the day. With tight seals come other problems: cavity resonances, a rise in the natural resonance point of the diaphragm (illustrated clearly by the cocktail-straw-under-the-pad trick on Stax Lambdas)..

 

Since everything affects everything else, it's very tricky to have it all in a headphone. You could say that there's never a single cause for anything you might hear a headphone do. It's as if you were engaged in game of 3-D chess with it.

 

If you start out with an excess of bass you can afford to trade some of it off, and get away with using a tight seal (as in the Lambda), or antiphase tricks like the baffle vents in AKG 'phones, the ones that replaced the passive diaphragms in earlier models. As far as I know, no one has transplanted an ortho driver into an AKG (or AKG-like) chassis. It might work.

post #21169 of 22863

I've got one set of SFI's in a K271mkII but the transplant was halted because it is disturbingly difficult to work with it. Until I lengthen the cables going to the drivers, the mere concept of drivers fixed to baffle is simply unthinkable. Not to mention with no fillers and damping inside at the moment, the sound is quite literally a brilliant mess. At least in the case of the K271mkII, the large cups hide a surprisingly shallow cavity.

post #21170 of 22863

I've got an unfinished SFI/Sextett transplant sitting on my bench. In mine, the drivers are mounted in the ring/gimbal system. I've got a ton of foam and felt in there to try and soak up all those treble reflections. Actually, I've gotten some better damping materials lately... I should give those a try. 

post #21171 of 22863

I had to enlarge the openings on mine. I really should find myself a better lit space to do dremel work (I sit in the corner of my garage stairs... poor light conditions or what) because it wasn't done that well.

Just for reference, roughly what kind of stuff did you put in there?

 

On another note, I did acquire myself some of that duct seal putty today and will be testing it out once this headache leaves me. Seems quite sticky... hopefully potential fillers won't all be stuck onto it. Maybe a layer of sand hmm...

post #21172 of 22863

Here's my build log: http://www.head-fi.org/t/569510/ortho-transplant-orthosex-sfi-into-akg-k240-sextett-lp-in-progress

 

I've got some scraps of acoustic foam I can try in there. 

post #21173 of 22863
Quote:
Originally Posted by vid View Post

Are the Unipolar the only electrets that can do bass or what? Then again, in stock form, I don't think they went too much below 80 Hz or whatever either.

I haven't run test tones through them but the Sony ECR-500 have plenty of bass.  I use mine daily at work driven by a Kyocera R-851.


Edited by scompton - 2/19/13 at 7:03pm
post #21174 of 22863

Shame I lost an ECR-500 auction by $0.01 last year... See if you can hear a 30 or 40 Hz tone on them?

post #21175 of 22863

I find a good deal on the Hp-3 but look like i doesn't come with stock pads?

post #21176 of 22863
Quote:
Originally Posted by proid View Post

I find a good deal on the Hp-3 but look like i doesn't come with stock pads?

 

It's just as well. Most stock pads today have no 'padding' left in them.

Looks similar though, so it shouldn't really affect the sound.

post #21177 of 22863
Thread Starter 

Yes, those non-stock pads may turn out to be a blessing if the covering is soft and pliable.

 

Doing a quickie look-around for the duct seal stuff, I find it's more often called "duct seal compound" or even "duct sealant". Amazon sells it (though the shipping kills the deal), Lowes, Home Depot.. shouldn't be hard to find, around $2.50 a pound.


Edited by wualta - 2/20/13 at 12:20pm
post #21178 of 22863
Quote:
Originally Posted by wualta View Post

Yes, those non-stock pads may turn out to be a blessing if the covering is soft and pliable.

 

Doing a quickie look-around for the duct seal stuff, I find it's more often called "duct seal compound" or even "duct sealant". Amazon sells it (though the shipping kills the deal), Lowes, Home Depot.. shouldn't be hard to find, around $2.50 a pound.

Are there any other pads that i can find to replace the stock pads without changing the sound?

post #21179 of 22863
Thread Starter 

Depends on which "sound" it is you don't want to change. Depends on where you live, too. Many enterprising folks on the thread have found all sorts of substitute earpads. Some even have made their own. Use the dedicated search engine: http://headfi.qix.it/megathreads/orthodynamic-roundup

post #21180 of 22863
Quote:
Originally Posted by scompton View Post

I haven't run test tones through them but the Sony ECR-500 have plenty of bass.  I use mine daily at work driven by a Kyocera R-851.

 

Quote:
Originally Posted by vid View Post

See if you can hear a 30 or 40 Hz tone on them?

 

Here.

 

http://personal.inet.fi/muoti/eimuoti/hz/1k_hz.wav

http://personal.inet.fi/muoti/eimuoti/hz/50_hz.wav

http://personal.inet.fi/muoti/eimuoti/hz/40_hz.wav

http://personal.inet.fi/muoti/eimuoti/hz/30_hz.wav

 

The idea being to compare at which point (50, 40, or 30 Hz) the response seems to start drooping in volume compared to the volume at 1 kHz.

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