Orthodynamic Roundup

[DefectiveAudioComponent]

PM:ed. I won't post the store here because I'm not sure they actually have the drivers.

 

[dBel84]

thanks - will look into it ..dB

 

[ludoo]

Quote:

Originally Posted by boomy3555 /img/forum/go_quote.gif Now don't Freak out everyone but my T50RP's are still burning in and I like to EQ the Crap out of the bass with them. Yummy Yummy, Sounds like a baby Utra900pro.

A baby what?

 

[Kabeer]

Ok time for more patents, this time we are visiting the history of the great Rank Organisation. The people who basically brought this technology to headphones.
(you can also view relavant patents at: Patent Searching and Inventing Resources)
My old post with a bunch of Patents can be found here.

Quote:

Possibly the original Wharfedale Isodynamic: ELECTRO-ACOUSTIC TRANSDUCERS - Patent Review 3833771 Pioneer SE-series Piezo's? (What's this got to do with Rank!) Vacuum stressed polymer film piezoelectric transducer - Patent Review 4064375 (and another pizeo from another company:Piezoelectric transducer - Patent Review 4156800) Some kind of early Iso bar magnet design (says loudspeaker, but the design seems to be for headphones): PLANAR VOICE COIL LOUDSPEAKER - Patent Review 3829623

Now here is something interesting from Strathearn, a subsidiary of The Rank Organisation.
Quote:

Pattern voice coil loudspeaker with baffles touching diaphragm - Patent Review 4156801

EDIT:
I'll just keep adding stuff here.

Quote:

Fostex 1975 T30-ish driver: Dynamic electroacoustic transducer - Patent Review 3898598 Planar driver design from the 60's: Electroacoustic transducers - Patent 3013905 Crazy 60's again: Patent LoginPatent Login Serpentine from '76: http://www.patentgenius.com/patent/3939312.html

I think I might have actually finally found the Yamaha patents!! (or at least some of them);
Quote:

Yamaha driver '83?: Electro-acoustic transducer - Patent Review 4413161 Yamaha style driver '75: http://www.wikipatents.com/3919498.html Versatile Transducer '66: http://www.freepatentsonline.com/3283086.html Olympus had all kinds of nutty ortho drivers! : http://www.wikipatents.com/4242541.html

Also here is a good link to see a whole load of planar drivers:
http://www.patentgenius.com/class/381/408.html

 

[smeggy]

Wow, that's the original Woofey all right. Final version was slightly different but essentially the same. Nice find!

 

[wualta]

And Nippon Gakki in Hamamatsu is the Yamaha Orthodynamics, all right. Good work! Have a McVities Lyle's Golden Syrup Cream cookie!

 

[smeggy]

Pic of taped up driver

 

[bjarnetv]

some non ortho updates, but still relevant as its planar news

after the great results from daming the chassis and sealing the baffle of my electrostatic floats, i decided to continue the ortho style modding, and make some pads.
i started out reducing the size of the baffle using "cardboard bitumen" and added some memory foam pads.

so how did it sound?
awful; closed in, and no bass.

im not exactly sure why yet, but i had to reduce the baffle size quite a lot to make them small enough to fit the pads, meaning it was like a huge inverted reflex disc (also known as a bass lens?), and i guess it didnt like that

edit: or maybe it didnt like being sealed? they sounded way better once i broke the earpad seal.

 

[boomy3555]

Quote:

Originally Posted by ludoo /img/forum/go_quote.gif A baby what?

'

Ultrasone Pro 900. : good bass excelent mids with a bit of fatigue in the highs

 

[wualta]

Quote:

Originally Posted by smeggy /img/forum/go_quote.gif Pic of taped up driver

What would happen if you razorbladed a slit in the micropore so the solder tab was OVER the micropore instead of under it?

 

[smeggy]

[evil] I haven't tried it yet, gotta do more evil experiments on it to see. [/evil]

hehe

 

[dBel84]

Quote:

Originally Posted by DefectiveAudioComponent /img/forum/go_quote.gif PM:ed. I won't post the store here because I'm not sure they actually have the drivers.

Just got off the phone with the "suppliers" - no stock

They claim a 10 day back order as they have to order in from Yamaha

..dB

 

[iQEM]

Quote:

Originally Posted by DefectiveAudioComponent /img/forum/go_quote.gif Someone with a big wallet sniped me on one of these T30-like Kenwoods this week. Very annoying.

yeaaahhh, i know how it's feel like...

Quote:

Originally Posted by sachu /img/forum/go_quote.gif speaker caulk for mass damping the front baffle.. 2 layers of thin felt ..dynamat linig on the back cup..

just wanna know,what's that black material around the driver ?

Quote:

Originally Posted by boomy3555 /img/forum/go_quote.gif ' Ultrasone Pro 900. : good bass excelent mids with a bit of fatigue in the highs

yes, agree with your impression...ULS PRO900 are a lil' bit sibilance too and still too slow bass for me...

 

[scompton]

I was able to use my T30 yesterday, all day, with no discomfort. Today, not even 30 minutes. I just switched to my SR-Gamma mainly because switching to that I don't have unplug anything. I'm trying to do a needle drop and I'm afraid I'd screw something up if I switch headphones in the jack.

Interestingly, I hear a lot more of the noise in the T30 than the SR-Gamma. I read a description of the noise as sounding like bacon frying and that's a perfect description of what I hear with the T30. With the Gamma, it's pretty much silent, even with the volume cranked. I'm thinking maybe a bit of high end roll off with the Gammas.

Edit: Interesting thing about doing a needle drop. I'm doing Days of Future Past. On side 1, the right channel was consistently 1-2 dB higher than the left. I figured I must either have a misaligned cartridge or the levels set wrong on my EMU 0404 USB. On side 2, it's the left channel that consistently higher. So it's not my set up by the LP. I wonder how common this is

 

[wualta]

Quote:

Originally Posted by iQEM just wanna know,what's that black material around the driver ?

Speaker caulk. The stuff some mfrs. use to seal woofers to their baffles.


Quote:

Originally Posted by scompton /img/forum/go_quote.gif Interestingly, I hear a lot more of the noise in the T30 than the SR-Gamma. I read a description of the noise as sounding like bacon frying and that's a perfect description of what I hear with the T30. With the Gamma, it's pretty much silent, even with the volume cranked. I'm thinking maybe a bit of high end roll off with the Gammas.

Are they being fed from the same output? Which amp is this, by the way?

As for levels being slightly off on pop LPs-- yes, this did happen, though it wasn't commonly noticed, because people weren't usually listening on headphones.In the world of analog, there are no rules. Still, something may be amiss-- that's part of the Analog Mystique too. Let us know if you discover anything.