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Orthodynamic Roundup - Page 220

post #3286 of 23349
Quote:
Originally Posted by wualta View Post
Try the Smeggimod! What've ya got to lose, Toulouse?
Is the smeggymod glueing some northern Italian sourced felt on the back of a SFI driver and using flimsey cheap felt on the front or is there more to it?
post #3287 of 23349
Thread Starter 
Ah, but gluing it down in a way that's more similar to Fostex's one-dot method (as used in the T40) than mine, which, if I used glue (and I have in past experiments), would involve laying down a thin layer of glue on the back of the magnet and gluing the felt down, preferably under tension, so that the felt can't move as the air breathes back and forth through it, as it will, however slightly, if it is glued down only around the circumference of the driver. When I say move, it's assumed that individual fibers will move and scrape over one another and convert some of the sound energy into heat. What we don't want, or at least what I didn't want, is any bulk motion of the damping layer.

You'll notice the diapers on A-T (and SFI) drivers are pulled taut and glued down as I described, and though the T40 has a strange attachment method for its diaper, the T20v2's is roughly the same as the A-T's.

However.. there are always other considerations. Normally I'd say that allowing the felt to move slightly and momentarily create a very tiny plenum for the escaping air would introduce a small mechanical nonlinearity into the system. But it just might be that this added nonlinearity compensates for an existing one. Stranger things have happened... And Ludoo and Smeggy are both over the moon about the sound. And I'm not above a bit of cheating, if you recall. So I say Smeggy's method bears some investigation.

Pssst: the magic's in the slave-leprechaun-manufactured Italian felt with its annealed and cryoaligned wool molecules.

.
post #3288 of 23349
Quote:
Originally Posted by wualta View Post

Pssst: the magic's in the slave-leprechaun-manufactured Italian felt with its annealed and cryoaligned wool molecules.

.
Dagnabit wualta, that's supposed to be a secret, only known to 'the society'.
post #3289 of 23349
Quote:
Originally Posted by smeggy View Post
Dagnabit wualta, that's supposed to be a secret, only known to 'the society'.
First rule of felt club is....
post #3290 of 23349
post #3291 of 23349
Now I'm more happy than I was earlier today as I just received GuyMe's AKG K-240DF in the post. I eagerly unwrapped them to have a quick side-by-side with the K-SFI and, like the K-240M I tried yesterday the SFI version is absolutely better in all areas except one, treble extension. Even that's relatively small.

The K-SFI goes deeper and more powerfully. The bass is a great foundation in these phones. They have real weight and authority as well as a very tuneful ability to make you grin and tap your feet. PRaT in all it's glory. The mids are smooth, sweet and oh so delicious. The upper part of the spectrum is something I need to refine a little when making these new ones. Using mine as a reference point I should be able to tweak them nicely I think. It's not bad by any means, slightly recessed and needing a wee tad more sparkle. Not too much or I think they'd lose some of what makes them sound so nice right now. It's going to be fun making these now I have a better idea of what's needed.

Listening to the vanilla K-240 after the K-SFI is... just.....so....... meh.

I'll keep you posted.
post #3292 of 23349
That is truly awesome. I am just so not impressed with USPS as they have lost my drivers, bah..dB
post #3293 of 23349
Thread Starter 
Quote:
Originally Posted by JadeEast
First rule of felt club is....
I know the reference to the movie, but the very idea that there could be such a thing as Felt Club, or even Felt Club For Men, gives me a fit of the giggles. No movie references required.

But wouldn't it be great to create the notion of a magic audio felt, made only in a tiny factory in Turin by ex Fiat employees from specially bred orthodynamic sheep fed a controlled diet of plasticizers whilst in the presence of ultrastrong magnetic fields? Their electret wool would produce a HyperFelt of astounding properties, sold only in the finest audio boutiques, demonstrated by supermodels skilled in the art of YH-100 disassembly by private appointment only. Ludoo could retire wealthy and we could skim enough off the top to capitalize a business making badly-damped isodynamic headphones as a tax writeoff.

Sadly, that will never happen. People are just too rational to buy something silly like Electret HyperFelt. Tell the leprechauns we're very sorry, they'll have to get back in their boat and row home.

.
post #3294 of 23349
Well Smeggy,

I have a $32 shipped pair of broken AKG K240S heading my way. Don't be surprised if I have to PM you for help (or ship them).
post #3295 of 23349
Lol Larry.
You'll need to send drivers too as I'll be running out

Anyway, GuyMe's phones are now in my evil clutches and they accidentally fell apart all over my sofa

Hehehe

Strangely, the inside molding of these are a little different from the Monitor version.

post #3296 of 23349
Quote:
Originally Posted by smeggy View Post
Strangely, the inside molding of these are a little different from the Monitor version.
That's not too strange, they're by all accounts a fair bit different in sound.

A diffuse-field equalized ortho would be interesting. Would require some elaborate felting I imagine.
post #3297 of 23349
Quote:
Originally Posted by smeggy View Post
Strangely, the inside molding of these are a little different from the Monitor version.
The ones I sent you had the same baffle used in the Sextetts, with the large holes for the passive radiators.

Keep the original drivers when you're finished modding, as they're not half bad and could be useful as replacements for DF owners.

I should probably track down a broken K240 too, and send it to Smeggy Enterprises for modding.
post #3298 of 23349
Quote:
Originally Posted by wualta View Post
...now just try and find one.

Did we ever figure out whether Sony sent the 600s anywhere outside Japan?
Those are my ECR-600's sitting on top of my vintage Kenwood amp. They were Japan only AFAIK and that special cable Sony used wasn't built to last long... You can read about it in the 'Case Stax thread.

Speaking of rare headphones I have a mint set of Stax SR-1's sitting on my head now... ...
post #3299 of 23349
Quote:
Originally Posted by spritzer View Post
Those are my ECR-600's sitting on top of my vintage Kenwood amp. They were Japan only AFAIK and that special cable Sony used wasn't built to last long... You can read about it in the 'Case Stax thread.

Speaking of rare headphones I have a mint set of Stax SR-1's sitting on my head now... ...
Woah, SR-1? That is too cool.
Detailed pics when you have time. That's a piece of history right there!

Quote:
Originally Posted by GuyMe
A diffuse-field equalized ortho would be interesting. Would require some elaborate felting I imagine.
Probably more elaborate than my feeble knowledge of acoustics can figure out.

Quote:
Originally Posted by Ludoo
The ones I sent you had the same baffle used in the Sextetts, with the large holes for the passive radiators.

Keep the original drivers when you're finished modding, as they're not half bad and could be useful as replacements for DF owners.

I should probably track down a broken K240 too, and send it to Smeggy Enterprises for modding.
As the instigator of my current madness, you'll definitely get something cool.
post #3300 of 23349

K-240 conversion progress

A little update on progress so far for those interested.

Drivers felted



Clamping the wood baffle to the plastic one after cutting the holes in the plastic and gluing them together.




Testing them out to see how it sounds. Pretty good so far. I stuffed some foam under the rear of the pads for comfort. The 240 pads are a little on the firm side and these would probably benefit from softer pads.




Felt lining all the innards




Felt lining the baffle interior



Glued drivers in place.


Now to let everything dry overnight and attempt some tight space soldering tomorrow.

Sorry for the crappy photography.
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