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Orthodynamic Roundup - Page 24

post #346 of 23431
Thread Starter 

T40v1 update

Okay, T40 version one owners-- Here's the scoop. You may not be as surprised as I was to hear what a little 6mm long tunnel going directly from the baffle to your ear does to the sound, but it was a semester's worth of education for me.

Oddly enough, Coby (yes, Coby)..


COBY CV-130-- A CAUTIONARY EXAMPLE

..did the same thing with the erstwhile Big Lots Favorite, their CV-130-- the World's Cheapest Audiophile Headphones ($6), [the briefly-available $8 Accura SR-660 was strong competition]. Under perfectly comfortable earpads they doubletaped foam rubber rings (also 6mm thick) to the baffle, surrounding the driver opening. This had two effects: One, the rings made the CV-130 uncomfortable, and two, they made it sound like you'd expect a $6 headphone to sound. Peeling the rings off (very easy) makes all the difference, and the same is true of the T40v1. It's hard to describe how crappy those goofy rings make the T40 sound, but "fear and loathing" comes to mind, so I'm going to break character and recommend doing a mod that actually changes a headphone-- even though it's in a very minor way-- despite the fact that it could affect the resale value. With that caveat, I say dump those foam rings. Arrgh! Rip 'em out and try to peel off every last crumb that sticks to the baffle! They be evil, I tell ye.

If you don't trust my judgment, and who would, just rip them off slowly so as not to destroy them and you'll find you can put them back, since the earpads will hold them on firmly. My money is on finding them in your wastebasket within five minutes.

Fostex, how could you?

Well, I think I know why they did it-- it gives a boost to the upper mids, which lends clarity to voices and instruments, no surprise given their pro audio mandate. But it messes up everything else.

Note well, this is my finding after doing the pink-foam mod shown earlier. I just cut out a square of the stuff roughly big enough to fill the square-shaped empty driver cup, foam "eggs" facing the driver, being careful to keep the foam out of the screw holes, etc. That's it. They now have a very extended treble (some might call it bright, but I'd call it very sparkly), and bass that, while it isn't the equal of the piledriving YH-100, is still pleasant and boostable. It just doesn't go very deep. This mod makes the T40v1 a poster boy for those skeptics who poohpoohed isodynamic treble. It doesn't sell isodynamic bass quite as compellingly.

Some of you (with some notable exceptions) may find the stock T40 sounds just fine simply minus the foam rings. Some will prefer the sound WITH the foam rings [shudder]. All I can say is: try it.
.


Edited by wualta - 8/17/10 at 7:20pm
post #347 of 23431
Interesting. I'll have to see if i can work up the nerve to deface my T40.

fwiw, I spent the afternoon performing what appears to have been a mostly successful ortho transplant.

I can't locate my camera at the moment, so, no pictures.

I finally got around to testing my absurd Cyberhome CH-SRD 600R "6 speaker" surround-sound 'phones with a digital surround source rather than a stereo pcm source.

And i can confidently say that they are the worst headphones i have ever put on my head, including free stuff that came with walkmen i owned in the late 80's, coupled with the biggest joke of a DAC the world has ever seen. Awful. Total rubbish. The crappiest crap that ever crapped.

Edit: Yes, worse yet than even mid-grade 70's paper-cone headphones, by leaps and bounds. The very worst.

Strangely enough there's a very positive review here:

http://www.bigbruin.com/2007/cyberhome_1

I say the guy who wrote that is tripping on acid. Or got a hefty check from whoever Cyberhome is. Worst Headphones Ever. You can get these crappy 'phones complete with lousy battery-powered dac / dolby decoder and various accessories for $20 from walmart.com:

http://www.walmart.com/catalog/produ...30660804302498

So i ripped the drivers out and threw them away, trimmed the baffles until they were flat, and glued my cast-off YH-2 drivers to them w/ permatex flowable silicone.

These are the cast-off drivers because, out of two pairs of YH-2's, I had two defective drivers. One driver where the center rivet has come loose, allowing the tab on the back of the driver to torque the diaphragm around - the other with the holes in the magnets not lined up at all.

I adjusted the latter driver so the holes are lined up now. It now has the same issue as the first. With great care, I can probably get the diaphragm into the right position.

These earcups are of the "half open" variety - grille on the bottom and solid on the top - with the opening for the 'woofer' at the bottom of the earcup. I sealed up the holes for the 'surrounds' with doner plastic cut from a yogurt container lid.

To start things off i used a single felt layer on the back of the driver and stuffed the earcup with foam. So far so good. There is bass, rolled off a bit, but it's there enough to enjoy the music.

Aside from the buzzing out of the #2 driver (the one i adjusted), which should go away when i get the tab adjusted, they sound a bit better than the stock arrangement.

Further experiments will follow.
post #348 of 23431
Thread Starter 
Quote:
Originally Posted by ericj
Interesting. I'll have to see if i can work up the nerve to deface my T40.
Deface For Victory. I'll be anxious to hear what you think. Somebody go wake up Inkmo and tell him he's finally got something easy to mod. If he's drawing something, don't bother him.

I should mention that when the mods are done, the T40v1 is even less efficient than the YH-100! But even though it doesn't have the YH-100's bass, I think I like the T40 better. Wouldn't want to give up the YH-100, though.

The modded T40v1 makes the unmodded T20v2 sound pretty awful I wonder how much of this is due to the earpads, which appear to duplicate the "tunnel" of the foam rings in the T40... further tests... sigh..



Quote:
Originally Posted by ericj
These are the cast-off drivers because, out of two pairs of YH-2's, I had two defective drivers. One driver where the center rivet has come loose, allowing the tab on the back of the driver to torque the diaphragm around - the other with the holes in the magnets not lined up at all.
Wow! I've never seen Orthos that abused! Who happened to them?


Quote:
Originally Posted by ericj
So far so good. There is bass, rolled off a bit, but it's there enough to enjoy the music.
I'm beginning to wonder about the lesser models in the Ortho line. Transplanted into a headset with circumaural earpads and a more or less vented cup, those things should have plenty of bass. Try covering the screen on the back of the cup with a layer of thin silk fabric or even felt. It won't work miracles, but it'll help a little.

Quote:
Originally Posted by ericj
Further experiments will follow.
Keep us posted, man.
post #349 of 23431
Cyberhomes? They were free after rebates.... why would you complain
post #350 of 23431
Quote:
Originally Posted by wualta View Post
Wow! I've never seen Orthos that abused! Who happened to them?
The first one, it got tweaked by me when i opened up the earcups on the 2nd pair of YH-2's.

The 2nd one, that wasn't lined up - if you held it up to the light, most of the holes were showing light through in about 1/3rd of their area.

I believe this was defective from the factory because the glue and markings on the circumference of the magnets indicated that it was as it was glued up.

Quote:
I'm beginning to wonder about the lesser models in the Ortho line. Transplanted into a headset with circumaural earpads and a more or less vented cup, those things should have plenty of bass. Try covering the screen on the back of the cup with a layer of thin silk fabric or even felt. It won't work miracles, but it'll help a little.
From the factory, the vent is covered with two layers of a thin nonwoven. I was considering throwing some felt over it, or adding another felt layer over the back of the driver, or both.
post #351 of 23431
Hi 2 all...
I just received a pair of probably the best old Soviet Union made isodynamic headphones - TDS 16. :O))
They need little cable repairement, so may be next week I will be able to make a micro review of them.. 7-8 years before i had another pair of them.. and till this days i remembering their sound.. SO there is a photo of them :O))
post #352 of 23431
Thread Starter 

Great! I'd love to know more about Elektronika [whoops, it's an Eko-- Echo] and its headphones. The TDS-5 is impressive (and, as always with me, damping experiments are pending). Any information on the TDS headphones will be very welcome indeed.

Thanks for looking in and joining our little (but slowly growing) band.


Edited by wualta - 12/4/11 at 2:45pm
post #353 of 23431
Might not be the right thread to ask , but my 'everyday' headphones for the last decade or so have been RS pro 60's. Any thoughts on these? Thanks. Kirk
post #354 of 23431
The only orthodynamic / isodynamic Realistic headphone was the Pro 30 - manufactured by Audio-Technica in the early 80's. The driver is quite similar to the driver found in the ATH-2, but not quite as efficient.

Edit: in fact, RadioShack only ever sold one other interesting headphone, and it was electrostatic.
post #355 of 23431
Hey, thanks EricJ.
post #356 of 23431
hey guys! I haven't been logged on in a couple of days and so I didn't get an update. Scraping off a foam ring? nuts! Would you say the bass is any more rolled off now than it was before? So far I've been enjoying the mids boost, and the T40 responds well to EQ, but I might give this one a try...

So, that 6 dollar Coby post mod is actually a decent headphone?
post #357 of 23431
Thread Starter 
Quote:
Originally Posted by Inkmo
hay guyze! I haven't been logged on in a couple of days and so I didn't get an update. Scraping off a foam ring? nuts! Would you say the bass is any more rolled off now than it was before?
Hard to say about the bass, since subjectively it's okay, the midrange hump being gone (and efficiency goes down, just as with the Yamamods) and all that. Got foam?

Quote:
Originally Posted by Inkmo
So far I've been enjoying the mids boost, and the T40 responds well to EQ, but I might give this one a try...
If you like the T40 as-is, more power to you, of course. Some (including me) complained of rolled-off highs, and I was beginning to think we weren't going to get the big improvements we were getting with the Yamas, since the damping was already close to optimum.

No need to scrape after removing the rings-- that was just me going overboard for comedy effect. If you like you can glue the rings back on, but i'd recommend silicone instead of the contact cement Fostex apparently used.

And yes! you too can be Lord Of Some Rings and try the Coby mod to see the effect they have. They really are decent cheapies, not too far off the KSC/Portapro sound but without the excess bassiness. See your Big Lots agent today and tell 'em some nut on the intarweb sent you.
post #358 of 23431
Do those Coby's fold? I was at my local Biglots yesterday and i saw 'em, but didn't buy 'em.

I was a little more intrigued by a Jensen 'phone that looks like some sort of k81dj knockoff, as a fosterfone. I'd have to cut a hole in the back and vent it, though.

Also noted that biglots sells the best wireless headset in the world for only $10.
post #359 of 23431
Thread Starter 
Quote:
Originally Posted by ericj
Do those Coby's fold? I was at my local Biglots yesterday and i saw 'em, but didn't buy 'em.
They fold the same way the T50/Maior folds: the earcups go flat, but the headband doesn't do any tricks.

Didn't buy 'em?? What kinda HFer would do something like that?

Quote:
Originally Posted by ericj
Also noted that biglots sells the best wireless headset in the world for only $10.
Eh? which one's that? And do you mean the best headset for only $10, or the best $10 headset?
post #360 of 23431
Quote:
Originally Posted by wualta View Post
They fold the same way the T50/Maior folds: the earcups go flat, but the headband doesn't do any tricks.

Didn't buy 'em?? What kinda HFer would do something like that?
I occasionally experience sharp pangs of frugality.


Quote:
Eh? which one's that? And do you mean the best headset for only $10, or the best $10 headset?
Well that's what it said on the box. Apparently Emerson makes the best headset in the world.
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