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Just listened to some Fostex T50RPs today... WOW!
Sep 3, 2011 at 11:05 AM Post #2,267 of 11,345
I placed an order for a t50rp at performanceaudio.com and got an email reply saying it is backordered 
frown.gif

 
Order cancelled.
 
Sep 3, 2011 at 12:07 PM Post #2,268 of 11,345

for those who cannot wait & don't want to pay the msrp, the T40rpMkII is available and should make an acceptable alternative. Hopefully someone who has modded both current t40 and t50 can chime in and report back.
Quote:
zammykoo said:
I placed an order for a t50rp at performanceaudio.com and got an email reply saying it is backordered 
frown.gif

 
Order cancelled.
Click to expand...



 
 
Sep 3, 2011 at 3:14 PM Post #2,269 of 11,345


Quote:
geetarman49 said:
for those who cannot wait & don't want to pay the msrp, the T40rpMkII is available and should make an acceptable alternative. Hopefully someone who has modded both current t40 and t50 can chime in and report back.


 
Click to expand...


Eagerly waiting to hear someone report about the other models as well.
 
 
Sep 3, 2011 at 4:45 PM Post #2,271 of 11,345


Quote:
dyna10x said:
LFF could you give us a description of your mods as you hinted that you have done something different.
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I will happily do so, with pictures, once I get some feedback and maybe some measurements....
 
 
 
Sep 3, 2011 at 6:19 PM Post #2,272 of 11,345
Just some CSD plots: http://www.head-fi.org/t/566929/headphone-csd-waterfall-plots/45#post_7728191
 
I'll be taking measurements for two people making mods on them. I'll also be making other data visualization tools to better see what's going on with the mods. In general, I'm keeping to waterfall plots in the time domain for damping type mods. If anyone wants the FR, I'll post those too.
 
Sep 3, 2011 at 7:35 PM Post #2,273 of 11,345
Sep 4, 2011 at 1:28 AM Post #2,274 of 11,345
Measurements are relative to each other (or my own as long as I used the same method.) So don't compare these with other peoples' FR graphs.

 
Blue - L channel - minor tweaks*
Purple -  R channel - minor tweaks*
Green - L channel stock
Red - R channel stock
 
*I don't know what he did inside, but the covering over the driver is removed - probably accounts for the extra treble peak. Again hard to say because I never measured Anaxilus' originals. Good thing I measured yours while they were stock. See 4 posts below for what was done.
 
Sep 4, 2011 at 5:20 AM Post #2,275 of 11,345
Thanks for the charts!
 
I met with a few other head-fi'ers today (all years of experience and all with high end ortho, electrostat, IEM and dynamic headphone experience) and they were the first to audition my modded T50RP's. I won't go into details, but the impressions were extremely positive.
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Sep 4, 2011 at 12:51 PM Post #2,277 of 11,345
If you move those modded plots down a little, all I see is bigger adverse dips.  Square wave, impulse response, and THD changes would be interesting.  The impulse response stock is awful and the THD is all over the place.  Smeggy has shown that it's definitely possible to improve all of these.
 
Well, the waterfall plots are a large-scale impulse response, I guess.
 
Sep 4, 2011 at 1:30 PM Post #2,278 of 11,345
I just clarified with Anaxilus what he did. They weren't intended as "mods" as he intends to remove the drivers. He was curious on the effect of the following tweaks:
 
  • Felt removed from front of driver
  • K271 paddeds added
  • Foam from vent removed.
 
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