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Just listened to some Fostex T50RPs today... WOW! - Page 659

post #9871 of 10820
Quote:
Originally Posted by E3SEL View Post

Could someone post a picture of how you are supposed to place the cotton in your headphones (as in how much are you supposed to pull it apart) I know it sounds like a newby question, but I have a feeling that for the past year that I have owned these headphones, I have been doing the cotton wrong. I have seen some pictures of people's cotton, but they weren't very clear, or seemed impossible to do with the cotton that I use, so sorry if I have actually missed a good picture.

http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements

You need dis

post #9872 of 10820

just compared my simple modded T50RP (paxmate in the cup floor and plasticine in the baffle) with the HD650 and i´m missing the mids (something in the middle) abit.i´d certainly like to see the frequency curve of my T50RP but don´t know anyone here in germany i could send them too?

post #9873 of 10820

Superdux where are you located in Germany?

post #9874 of 10820

i live in Braunschweig near Hannover. But i´ve sent the same question into the german hifi-forum.de if someone knew anyone with a dummy head to measure them.
 

post #9875 of 10820

Do any of you  guys have left all 4 vents open? In my opinion opening up the vents improves soundstage and imaging vastly, the mids are also lush.

post #9876 of 10820
Quote:
Originally Posted by Nevod View Post

The mod is very extensive. He picks the drivers, removes stock paper, saws through metal plates, mades wooden earcups no less than 10mm thick, and does custom damping, cup volume matching and earpad matching for each driver till +-2 dB.

I still think that uber-damping is an easier way to achieve flat sound from Fostex. But to get flat FR above 10 kHz, one would have to damp within driver anyway..

 

I think this guy is doing same thing with drivers ...

 

http://player.ru/showthread.php?t=58608&page=11

post #9877 of 10820
Quote:
Originally Posted by MuZo2 View Post

 

I think this guy is doing same thing with drivers ...

 

http://player.ru/showthread.php?t=58608&page=11

 

 

Man, it's in Russia things are happening! Interesting to see the magnet bars and the damping. That frequency response sure is impressive, with less of a midrange dip than usual.


Edited by MDR30 - 1/23/13 at 8:08am
post #9878 of 10820
Quote:
Originally Posted by MuZo2 View Post

Do any of you  guys have left all 4 vents open? In my opinion opening up the vents improves soundstage and imaging vastly, the mids are also lush.

I leave em open!

post #9879 of 10820
Quote:
Originally Posted by MuZo2 View Post

Do any of you  guys have left all 4 vents open? In my opinion opening up the vents improves soundstage and imaging vastly, the mids are also lush.

I closed 3 on each side.

post #9880 of 10820
Quote:
Originally Posted by MDR30 View Post


Man, it's in Russia things are happening! Interesting to see the magnet bars and the damping. That frequency response sure is impressive, with less of a midrange dip than usual.


Midrange is doable with BMF's mods entirely, these seem to address the 11k resonance problem. Or it could be the quirk of measurement actually - all the RMAA measurements seem to be somewhat too flat after 10 kHz..

I think that could be done in less destructive way. But I'm not going into the drivers before I get another pair.
post #9881 of 10820

 

 

LEAD Technologies Inc. V1.01

 

 

Here is FR measured on my DIY panasonic 61a
Red =right, orange = left
Green = dbv2 - FA-003 Pads (micmacmo). Baffle Port Closed for reference.


Edited by MuZo2 - 1/23/13 at 12:16pm
post #9882 of 10820

That's a crazy dip between 8-9kHz... is it an actual drop or a measurement artifact?

post #9883 of 10820
Quote:
Originally Posted by Armaegis View Post

That's a crazy dip between 8-9kHz... is it an actual drop or a measurement artifact?

Probably it is the latter. I get those a lot too.

post #9884 of 10820

The green graph plot is from BMF and the drop I guess is coming from his measurement rig.

post #9885 of 10820

I'm not sure those chasms are artifacts. I got them in my readings (same setup as BMF's) too. I've attributed them to the "pinna notch" (discussed on page 5 of this graduate thesis), the product of destructive interference caused by the outer ear. The exact depth and location of the notch varies in my readings, but it's often there. 

 

Also, with some mods/certain pads, the effect is audible in log sweeps. YMMV.

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