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Fostex T50RP Incremental Mods and Measurements - Page 70

post #1036 of 1215
Quote:
Originally Posted by jgray91 View Post

what would the effect of putting paxmate rings on ear side baffles? I forgot :P

I found that it tightens things up  and takes the 'honk/roominess' out of the sound. (so that you don't hear the cups, just the driver)

But it's quite subtle.

post #1037 of 1215

Almost everything in here is about controlling resonances. The earside chamber is just as important as the cup side; we just don't have the luxury of stuffing a ton of stuff on that side without it becoming physically uncomfortable. As for the exact changes... that depends on how much you use, your pads, your ears, etc.

post #1038 of 1215

Does anyone know how these would work with an Asus Xonar Essence SDX, I'd love to get a pair for modding, but I can't really afford any external amp at the moment.

post #1039 of 1215

No experience with that particular soundcard but it should be more than satisfactory to drive it.

post #1040 of 1215

I've been enjoying Nicks memory foam mod for a few days now, inside a T20RP MKII (same driver as T50)

I can strongly recommend it.

To my ears the FR is more v-shaped than neutral, but in a good way that makes it sound like I'm listening to a large set of speakers.

The mids are therefore a little cold... maybe recessed(?) - that might be too strong a word, depends on the headphone I was previously listening with, before my ears have fully adjusted.

♦ If I was previously listening with Sennheiser Momentum it sounds a little cold but much more spacious and airy.

♦ If I was previously using Fostex T10 (mid-centric) it sounds very cold and scooped.

♦ After 5 minutes either way, and my ears have had time to adjust to the FR, it just sounds like a really fun slight v-shape that goes with any genre.

 

The speed and decay of the treble and bass is totally unexpected of this headphone. (from previous experiences)

There is almost no bass bloom, and the closest thing to 'air' I think I've heard from a 'closed' headphone. (ok...so there's one tiny vent)

 

The sound is very dry though, and may be a little too detailed for some tastes. There's quite some attack in the whole FR.... I think overall this is what some people call 'good PRAT'(?)

The only thing I think is missing is some roll-off at the very bottom end 40Hz(?) down. I just feel like a few electronic tracks are missing the very lowest grunt that you feel rather than hear.... but very few headphones are capable of satisfying this frequency at any price without suffering a low/mid bass-hump, which is easy to forgive from a sub $150 headphone.

 

Cheers to everyone involved in this mod. :beerchug: 

post #1041 of 1215

Hi,

 

I own a HD600 but my wife is not happy when I listen to music in the bed during night because of noise due to the open nature of HD600.

Does the Fostex T50RP have sufficient isolation and therefore  a solution?

 

Thank you for your comments

 

northernsky


Edited by northernsky - 5/25/14 at 11:04am
post #1042 of 1215
Quote:
Originally Posted by northernsky View Post
 

Hi,

 

I own a HD600 but my wife is not happy when I listen to music in the bed during night because of noise due to the open nature of HD600.

Does the Fostex T50RP have sufficient isolation and therefore  a solution?

 

Thank you for your comments

 

northernsky

If you're willing to mod it, they're almost totally silent after the 'paxmate' mod (see page 1).

post #1043 of 1215

What is the difference between the T50RP's and the T40RP's?  Can the T40's also be modded just like the 50'S?  How about the T20RP's?  

post #1044 of 1215

T40's are closed back - not vented, which makes these more difficult to tune successfully. 

T20's are almost identical to T50 with less stock damping - these sound awesome with mods.


They all have the same drivers, so T50 or T20 .... just pick your rod colour, gold or silver :o

post #1045 of 1215
Thread Starter 
Quote:
Originally Posted by ts8169 View Post
 

What is the difference between the T50RP's and the T40RP's?  Can the T40's also be modded just like the 50'S?  How about the T20RP's?  

The drivers, cups, etc are the same. Rumors have circulated that the T50RP has tighter tolerances than the other two.

 

There can be significant differences within the same model due to variations in the type, thickness, and permeability of the stock white material glued to the back of the drivers.

 

It's a good idea to measure your headphones' Frequency Response before you begin to modify them. This will tell you if they are balanced, or not. This is important to know because you can adjust your mods to bring the Left and Right Channels into balance. Baseline measurements are also very helpful after modification when you move into the tuning phase. Remember to make baseline measurements for each set of pads you plan to use.

 

Here are the differences between models:

 

T50RP has stiff felt over the inner cup vents and a plastic cover over the central screw compartment.

 

T40RP is completely sealed. You may choose to leave the plastic covers over the inner cup vent area, modify them with small 3 to 4 mm bass ports, or remove them depending on your design, goals, and results.

 

T20RP mkII is more open than T50RP because its cup vents are more "air permeable" than T50RP. T20RP uses a clear plastic mesh over the internal cup vents. There is no plastic cover over the central screw compartment. You may choose to further damp the mesh and cover the central screw compartment.

 

I've modified many T50RPs, T40RPs, and T20RPs and cannot tell them apart once they have been modified and tuned. 

post #1046 of 1215
Quote:
Originally Posted by GREQ View Post


 

T20's are almost identical to T50 with less stock damping - these sound awesome with mods.

Stock damping ?

 

EDIT: Clear from BMF post now.

 


Edited by MuZo2 - 5/28/14 at 8:36am
post #1047 of 1215
Thread Starter 
Quote:
Originally Posted by MuZo2 View Post
 

Stock damping ?

 

Actually, minimal damping but here it is.

 

All 3 models:  35 x 35 mm white, semi-permeable material glued to the rear of the drivers. Some version of this goes all the way back to T10 and T20.

 

T50RP:          19 x 26 x 1 mm stiff felt over the internal cup vents

 

T40/50RP:      plastic cover over central screw compartment

 

All 3 models:   ultra thin dust cover over ear side of the drivers

post #1048 of 1215



 


 

post #1049 of 1215
Me jealous wink.gif
post #1050 of 1215

Wow, those are beautiful. I hope they sound as good as they look!

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