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Orthodynamic Roundup - Page 1475

post #22111 of 23650

 

Filled the cups with some amount of cotton wool to improve image coherency. (An extra tweak might be to put pantyhose in there as well to try keep strands of cotton from poking through the grille.) Tuned the EQ slightly both by ear and, in the 200–1000 Hz range where measurement and perception tend to correlate most, graph.

 

I'll adapt some words by AKG to describe the sound.

 

The modified HOK 80 superior reference headphones offer the most pure and natural sound possible. The modified HOK 80 empower to experience the smallest sonic details with the most accurate balance.

 

The modified HOK 80 transducer is the largest KWH has ever built. The transducer was developed to push the boundaries, to get as close as possible to sonic perfection.

 

With the ultra-lightweight voice coil a superior impulse response and an extended frequency range is guaranteed.

 

The modified HOK 80 provides the most precise and powerful experience possible.

post #22112 of 23650
Quote:
Originally Posted by nick n View Post
Cars , what do they use that for on cars?

 

 

The worst offenders I've seen have sprayed their whole car to give it a black matte 'paint'job.

 

 

@BMF, you got any names to those spray stuff you found made by other brands?

post #22113 of 23650

Before the topic dies out I want to stress not only VENTILATE the room, but DO NOT put stuff back together until you are definitely sure it has cured, and then some.

 

I got impatient but it still had a bit of offgassing and put a T50 together, In the process of doing the updated V2 uber-mod to it I opened up the opposite side and saw the Newplast had begun to react to it and go all wet on top.  Lucky lucky. Could have possibly screwed the diaphragm had i not noticed that.. who knows.  So beware. 

 

and application to fabric don't bother it gets too stiff and unwieldly. trust me.


Edited by nick n - 10/20/13 at 10:39pm
post #22114 of 23650

iQEM i see you reaaading... what's new?

 

Still happy and enjoying your latest mods?

 

@vid: thankyou for not mentioning about how perfectly the HOK80 let's you hear what the artist inten.... nevermind.

 

 I'm still enjoying mine they have a special something about them for sure. Need some sealing up and modding of course . Funny not much has popped up for them lately I'd like to grab a cheap V2 eventually. Wonder if the driver is different or just damping?

 

Heck just the sturdy build and style alone is enough for the admission price in my books. Neat E German industrial type stuff, like a bit of history. Nothing else I have feels or looks like they do, even all the old Soviet stuff.:dt880smile: 


Edited by nick n - 10/21/13 at 3:20pm
post #22115 of 23650

Oh yeah, forgot about the artist's intention. It's indeed communicated in the sound.

 

Thing is, though, and being serious, I find the HOK to have highly increased - and very high - resolution in their modded/EQd form, emphasis on EQd. I've done a number of tests of EQ vs. physical mods and it seems to me that an EQ towards perceived flat by itself can improve the sound both subjectively and objectively; most importantly, not manifesting only as a shift in frequency response but in the perception of fidelity, e.g. as increased resolution and measured rate of decay.


Edited by vid - 10/21/13 at 4:15am
post #22116 of 23650
Quote:
Originally Posted by vid View Post
 

Oh yeah, forgot about the artist's intention. It's indeed communicated in the sound.

 

Thing is, though, and being serious, I find the HOK to have highly increased - and very high - resolution in their modded/EQd form, emphasis on EQd. I've done a number of tests of EQ vs. physical mods and it seems to me that an EQ towards perceived flat by itself can improve the sound both subjectively and objectively; most importantly, not manifesting only as a shift in frequency response but in the perception of fidelity, e.g. as increased resolution and measured rate of decay.

 I noticed this again last might and all I did was use that Arctic Cotton i think in there a  key ingredient to bring that part up/expose that

 

( non- EQ'd just using a beefy Integrated )

 

This aspect you describe of the sound was standout, very obvious and awesome, even with the lower bass levels it was extremely more than satisfying.


Edited by nick n - 10/21/13 at 3:26pm
post #22117 of 23650
Quote:
Originally Posted by kalbee View Post
 

 

 

The worst offenders I've seen have sprayed their whole car to give it a black matte 'paint'job.

 

 

@BMF, you got any names to those spray stuff you found made by other brands?

I don't remember the name brand of the non-aerosol stuff I saw at Home Depot. I'll check the next time I'm there.

 

Rust-O-Leum spray on rubber seal.

 

Plasti-Dip spray on rubber coating and paint on rubber coating.

post #22118 of 23650
Quote:
Originally Posted by nick n View Post

iQEM i see you reaaading... what's new?

Still happy and enjoying your latest mods?

lol
well yes nick, nothin new though..
just fix some defect sound on the right channel that came out from 33-35 years old T30's stock cable..
the ground tip cutted or split from the solder pad..because of age i guess, so resoldering em back and now doing just fine...
happy again, offcourse having my T30's functioning without any problem..even not on their best condition...
the right side arm fork had break 2 times, glued em back solve this but its never look as good again..
i had tried replace the whole headband with cheapo headband but its ruin the whole look, so i switched back to the original headband..
that plastic-chrome fork are their weakness spot..so please be very careful with that, especially to all T30 owners... smily_headphones1.gif
post #22119 of 23650
Quote:
Originally Posted by nick n View Post
 

This aspect you describe of the sound was standout, very obvious and awesome, even with the lower bass levels it was extremely more than satisfying.

 

Interpreting the graph, the modded HOK potentially has more resolution than the Stax SR-5. The HOK driver is certainly faster to stop.

post #22120 of 23650

Stax SR-5 KWH HOK 80, modded

 

Tweaked the HOK EQ more to increase the measured rate of decay in the lower mids and upper bass. Looks decent, better than the old Stax.

 

Did a short comparison between the two. I think that, overall, the resolution is about the same, but to me the HOK sound more responsive in the lower region. It wasn't a blind comparison. The Stax tend to emphasize their detail a bit more - there's a treble peak - but this doesn't come across as extra resolution, just flaunting what's there. The Stax sound a bit boxy, but the ear gets used to it quickly; the HOK are a bit more relaxed and natural-sounding, with a wider soundstage.

post #22121 of 23650
Quote:
Originally Posted by vid View Post
 

Stax SR-5 KWH HOK 80, modded

 

Tweaked the HOK EQ more to increase the measured rate of decay in the lower mids and upper bass. Looks decent, better than the old Stax.

 

Did a short comparison between the two. I think that, overall, the resolution is about the same, but to me the HOK sound more responsive in the lower region. It wasn't a blind comparison. The Stax tend to emphasize their detail a bit more - there's a treble peak - but this doesn't come across as extra resolution, just flaunting what's there. The Stax sound a bit boxy, but the ear gets used to it quickly; the HOK are a bit more relaxed and natural-sounding, with a wider soundstage.

If you mean the decay in the bass region only then yes, but that ringing at ~4k on the HOK is really not enticing to my eyes, and while close it still falls short of the SR-5 in the upper treble extension.

 

Impressive nonetheless.

post #22122 of 23650

It slips my mind,  was there two manufacturers there ? Mine are RFT you mentioned also KWH, is this a case where it's simply different state run factories a la Soviet Union stuff of the time?  Also impressive find there i never would have thought to compare the two. Recently sold the SR-5 super cheap compared to what's been selling lately.... oh well.


Edited by nick n - 10/23/13 at 6:30pm
post #22123 of 23650

Treble extension matters if you're young; I personally can't hear above 16 kHz and don't mind as long as up to about 13 kHz is there. The ringing at 4 kHz (actually, 3 kHz) is an ear canal resonance - purrin, for instance, doesn't model the ear canal in his measurement setup as far as I know, so his measurements would hide this sort of thing (right or wrong). I'd say the resonance looks pretty normal on the HOK.

 

I call them KWH for the factory they - or at least the drivers - were made in. As far as I understood it, RFT is sort of like the label 'Hi-Fi', i.e. describing a certain type of product but not specific to any one company.

 

I'd take the modded HOK over the SR-5 if I had to choose, but I quite like the SR-5 as well.

post #22124 of 23650
Quote:
Originally Posted by iQEM View Post

my new pads has arrive for the T30's, yes finally got myself a Sony MDR XB500 pads to replace the cracking Sony V700 pads..
i purchase it from german auction with a help of my friend that lived there..
several days only using my son T10's because of the T30's need to be re-terminated..
now there's a reason to reterminated the T30's, well here it is with the new pads & new mini jack...
comfy does improves alot, i'll share the impression of sonic change later.. wink.gif




I even have try to use the pads on T10 before made my mind to reterminate the T30's..
Well, its good to know that this pads usable too on T10's... smily_headphones1.gif

 

 

iQEM, you make me jealous with that massive "truck tires" earpads.

So I purchase original lambskin leather, and will made mine for T50RP, soon :wink_face: 

 


Edited by audiofreakie - 10/23/13 at 9:21pm
post #22125 of 23650

Bit of a refresher on the YHE-50A conversion to stereo. Guess there's a limited audience for these though. Not common at all. Got these in from Japan a while ago but was always scared to open them up.

Really I was.

 

Someone was selling a bunch of them, sadly what was cheap in Japan after shipping to a forwarder's warehouse then their shipping over here it ended up a fair bit more.

They were sealed in a bag new condition not a spot of dust. So yes brand new. and NO MUSTY smell. Booyaw.

Someone clearing out an Electronic Organ store possibly ?

 

 Another shot of the driver.

 

 

Managed to figure out what the earlier tutorial was getting at. I'd like to thank everyone here who posted about these it sure helped.

 

I took a sharp Exacto/utility knife then around the very thin seam where it is ( was ) glued shut I began making a few slow rocking hard cuts into it until I heard some glue crack and then  worked a smaller thing screwdriver into the seam and along. Initial cuts were maybe at 6 points along the seam just to keep it gradually opening without jamming as i pried the screwdriver tip around.

 When I came close to the 3 push-tabs I made sure that while applying opening pressure with that thin  screwdriver in the widening seam, to press the tab as I was prying the seam open along the perimeter of the cups.

 Only managed to break 1 out of 6 tabs!!!!! I consider that a success. Oh well.

 

 

There was a thin layer of decayed black foam, and I mean thin. See picture below.

 

Of course it was necessary to change these over to stereo. Looking through this now massive parts bin I settled on a nice silicone-type rubber cable from a Sony I stripped for parts ( XB100??)

 Sony to me makes some of the nicer cables since they are lightweight, hold zero memory, and use a nice super flexible rubber. Top notch and easy to work with.

 

Strain-reliefs were kept stock ( obviously left in the stock headband wire )  and it was very easy to add the stock left side cable entry  strain-relief onto the new Sony cable.

 

Damping. I was freaking out about damping. First i read "just a bit", then read " a whole bunch "

 

Yikes.

Once these are put together I didn't want to screw with them again. Actually they have no screws ( har har ). So used a solid disc of Arctic Bamboo material in the rears ( notched at 3 tab points and 3 riser pegs ), which is sort of just enough damping, a middle ground.. Always err on the side of bass i have learned:gs1000smile:  Treble happy is not for me, used to be. So long as detail isn't flooded out, there's not a lot of resonant crap, and there is nice subtleties in detailing heard, that's perfect.

 

Tested one side of the damping on the broken tab side before I slammed this thing shut since it was easy to reopen.

 

One side didn't seal perfectly due to the broken tab. It would stay in place and it held yes,  but to make it even and make sure while going for a walk they didn't separate, I cut down some clear scotch tape and tightly resealed the edges. Can't even see it since I lined the edges up with the beginning edge of the cup rears. Usually I use an extra seal of electrical tape if need be ( on a couple builds only ) and wrap the pad edges over so it is invisible, Clear worked better than i expected here.

 

So to give a size reference here it is compared to a Cowon D2 and Colorfly C3. These things ARE SMALL! Yes, smaller  than the HP-50 by far.

 

 

^ See what I mean about the condition. Grok that headband there. And the great cool little pads. Closeup. Minty. Flawless.

 

Off for a walk to test . Crossing fingers here. This will be the first few minutes of use ever put on these I think.  Total now = ~ 3 minutes :redface:That's a good feeling.


Edited by nick n - 10/27/13 at 5:09pm
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