Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › Just listened to some Fostex T50RPs today... WOW!
New Posts  All Forums:Forum Nav:

Just listened to some Fostex T50RPs today... WOW! - Page 715

post #10711 of 10713
Quote:
Originally Posted by ZGLISZCZ View Post
 I will post long story about my modding but not today, today I got pictures and not enough time.

Looking forward to the reasoning and process behind the decisions related to the sound. You crack open the driver like it's standard procedure, kudos. Any thought of gasketing the interface between the diaphragm and the housing?

post #10712 of 10713

Hi guys, and thanks for your comments. Just as before my post will be chaotic. Sorry for that:)

 

 

Quote:

Originally Posted by cripple1 View Post
 

Well this certainly does look interesting. What're the pads and how do they sound with wood enclosures?

 

Pads are made by me, they make really nice sealing even without stretched strand (around the edge), after final mod I will stretch strand more but not now as it will close access to inside (probably I will also use some strong double sided tape just in case to seal it even more), I know it will further improve bass response. I attached quick messy sketch from the top view just to visualise sealing ( I will make better pictures of all details when I'll finish them.

Ear is inside comfy chamber and have pad even behind it. Baffle is shaped so there is space for that. Driver are angled but parallel to back wall of the enclosure (actually Im not sure any more if its better that way). Till now they sounded in thousand different ways;) I was jumping through this massive thread when making them but I focused on info from http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements . As my work is bit different to original enclosure and pads, mods did work in different way for me. Sound was many times ultra extended from low to high but there was no mids just huge U shape. SS was also great somehow but there was no life in them, they were stiff like gym exercise in a too-close-fitting suit (guys sorry for my English, I know...). Now I think that I just overdamped them in that time but it might be the pads. To restore mids and liquid honey I decided to remove white dampening material from back of the driver (from t20rp) and do some mods with all sorts of felts etc. Some of those mods you can see on pictures. They become more punchy, sassy and mids came back alive. But there was this legendary low-mid hump that made Kate Bush sound like if she catch a cold... although Cinematic Orchestra, Flanger and Burnt Friedman sounded thrilling. One day I did some small adjustments to driver dampening and after that I was there: https://www.youtube.com/watch?v=vUh5BWfrF6U

Detail madness from end to end... I didnt believe cd quality got so many informations inside. I think only Dead Can Dance Spiritchaser sounded similar on my k701. Those bastards become so revealing that I started to hear all sorts of distortions in many albums and I become obsessed that one of the driver cause those distortions. So I opened my perfect config and rip of all driver dampening, beewax, and open again both drivers (not the first time and not the last). I changed configurations (those failed improvements...) and check again, distortions was still there, so I was opening the drivers few more times and later I rip of this fancy crate from ear side... Later when I accidentally destroyed one of the diaphragm and get back to my k701 I realised that distortions were in my testing tracks, just not that obvious on k701. So yes they were sound in many different ways, I think they were easy to overdamp even with lots of space inside comparing to original enclosure.

 

Quote:
Originally Posted by Armaegis View Post
 

That is mind-boggling how much modding went into that. Is that a cork-like material inserted between the magnets? You appear to be blocking some of the holes in the driver itself. And I find it curious that for all the crazy damping in the cup and surrounding the driver, there doesn't appear to be any on the ear-side under the pad?

 

On pictures you can see few different variants, I didn't put inside all of this at the same time. Its a shame that I didn't really made more pictures as there was lot more. that "cork like material" is actually some sort of hardened felt but not like those used in Rastapants its like this: http://www.woodiesdiy.com/Product/woodies-floor-guard-114-x-152mm-sheet/18601/1.3.2.7#.VEgmZ_mG8bg

cuttet to tiny squares and stripes. Actually this idea comes from Radical Russian Mod (BMF got links) and also from one of the post (I will try to find it later) where some of you mentioned that t50rp got some reflections even after taking of enclosure and listening it only with baffle and pads. I though it might be good idea to mess around inside driver. Well using felt inside was silly as small fibres were touching moving diaphragm, but I will try other materials.

 

I was thinking about dampening ear side, I can hear reflections and that was one of the reason I stop care about ear side look as I was planning to cover it with some acoustic foam or something. Also at the end I didnt really dampen them that much inside as beewax and sturdy enclosure did the work nicely. Mostly I was messing with driver dampening. 

 

Quote:
Originally Posted by frank2908 View Post
 

pls pls show me how to make custom earpads. I have already cut out memory foam and lambskin to shape but gave up on the sewing as it is hard to align leather when it is stretchable.

thanks

I will make tutorial showing how I did it but not that soon as its time consuming and I want to do that when I will start doing next headphones. First I want to fix and finish those. What you should keep in mind is watching all the time if one of the piece is not moving slightly to avoid mismatch ( I know its worthless tip ) try to draw lines on the other side of lambskin pieces (side that wont be seen). Control those lines and fix any mismatch just after they appear. You might try to stick pieces together with tape to avoid sliding. I will need to do proper tutorial to help you more. Also dont watch movies when you sewing :) and be patient.

 

Quote:
Originally Posted by thune View Post
 

Looking forward to the reasoning and process behind the decisions related to the sound. You crack open the driver like it's standard procedure, kudos. Any thought of gasketing the interface between the diaphragm and the housing?

 

I open them for many times but now they look like they look... many screws doesn't hold them any more, but bee wax is the cure for any issue;) driver enclosure is made from worst plastic ever... its really brittle. I'm thinking about making 2 more wooden sets (this time smaller) but also 3d printed enclosure and driver body. Ear side plastic part of driver enclosure will be integrated with baffle as one part (I will transplant magnets with metal parts) I'm thinking about posting my projects here and ask for feedback as I dont really know much about acoustic and physics. We can all benefit as I will share for free my .OBJ file with anyone interested in printing it. But that in a future if anyone will be interested. I will also make baffle variant without integrated driver for everyone that don't want to mess with it. Well that's a lot of promises but I think it will happen. Its just that I dont have much free time so it will take a while.

 

Thanks to everyone, and sorry tor chaos

post #10713 of 10713

Outstanding work and documentation, ZGLISZCZ! Thank you!

 

For stripped threads, how are you using bee's wax?

 

Stock cup threads that become stripped can be repaired with super glue. The "how to" is shown in Post #1 of FIMM.

 

Quote:

Originally Posted by ZGLISZCZ View Post
 

 

Pads are made by me, they make really nice sealing even without stretched strand (around the edge), after final mod I will stretch strand more but not now as it will close access to inside (probably I will also use some strong double sided tape just in case to seal it even more), I know it will further improve bass response. I attached quick messy sketch from the top view just to visualise sealing ( I will make better pictures of all details when I'll finish them.

Ear is inside comfy chamber and have pad even behind it. Baffle is shaped so there is space for that. Driver are angled but parallel to back wall of the enclosure (actually Im not sure any more if its better that way). Till now they sounded in thousand different ways;) I was jumping through this massive thread when making them but I focused on info from http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements . As my work is bit different to original enclosure and pads, mods did work in different way for me. Sound was many times ultra extended from low to high but there was no mids just huge U shape. SS was also great somehow but there was no life in them, they were stiff like gym exercise in a too-close-fitting suit (guys sorry for my English, I know...). Now I think that I just overdamped them in that time but it might be the pads. To restore mids and liquid honey I decided to remove white dampening material from back of the driver (from t20rp) and do some mods with all sorts of felts etc. Some of those mods you can see on pictures. They become more punchy, sassy and mids came back alive. But there was this legendary low-mid hump that made Kate Bush sound like if she catch a cold... although Cinematic Orchestra, Flanger and Burnt Friedman sounded thrilling. One day I did some small adjustments to driver dampening and after that I was there: https://www.youtube.com/watch?v=vUh5BWfrF6U

Detail madness from end to end... I didnt believe cd quality got so many informations inside. I think only Dead Can Dance Spiritchaser sounded similar on my k701. Those bastards become so revealing that I started to hear all sorts of distortions in many albums and I become obsessed that one of the driver cause those distortions. So I opened my perfect config and rip of all driver dampening, beewax, and open again both drivers (not the first time and not the last). I changed configurations (those failed improvements...) and check again, distortions was still there, so I was opening the drivers few more times and later I rip of this fancy crate from ear side... Later when I accidentally destroyed one of the diaphragm and get back to my k701 I realised that distortions were in my testing tracks, just not that obvious on k701. So yes they were sound in many different ways, I think they were easy to overdamp even with lots of space inside comparing to original enclosure.

 

 

On pictures you can see few different variants, I didn't put inside all of this at the same time. Its a shame that I didn't really made more pictures as there was lot more. that "cork like material" is actually some sort of hardened felt but not like those used in Rastapants its like this: http://www.woodiesdiy.com/Product/woodies-floor-guard-114-x-152mm-sheet/18601/1.3.2.7#.VEgmZ_mG8bg

cuttet to tiny squares and stripes. Actually this idea comes from Radical Russian Mod (BMF got links) and also from one of the post (I will try to find it later) where some of you mentioned that t50rp got some reflections even after taking of enclosure and listening it only with baffle and pads. I though it might be good idea to mess around inside driver. Well using felt inside was silly as small fibres were touching moving diaphragm, but I will try other materials.

 

I was thinking about dampening ear side, I can hear reflections and that was one of the reason I stop care about ear side look as I was planning to cover it with some acoustic foam or something. Also at the end I didnt really dampen them that much inside as beewax and sturdy enclosure did the work nicely. Mostly I was messing with driver dampening. 

 

I will make tutorial showing how I did it but not that soon as its time consuming and I want to do that when I will start doing next headphones. First I want to fix and finish those. What you should keep in mind is watching all the time if one of the piece is not moving slightly to avoid mismatch ( I know its worthless tip ) try to draw lines on the other side of lambskin pieces (side that wont be seen). Control those lines and fix any mismatch just after they appear. You might try to stick pieces together with tape to avoid sliding. I will need to do proper tutorial to help you more. Also dont watch movies when you sewing :) and be patient.

 

 

I open them for many times but now they look like they look... many screws doesn't hold them any more, but bee wax is the cure for any issue;) driver enclosure is made from worst plastic ever... its really brittle. I'm thinking about making 2 more wooden sets (this time smaller) but also 3d printed enclosure and driver body. Ear side plastic part of driver enclosure will be integrated with baffle as one part (I will transplant magnets with metal parts) I'm thinking about posting my projects here and ask for feedback as I dont really know much about acoustic and physics. We can all benefit as I will share for free my .OBJ file with anyone interested in printing it. But that in a future if anyone will be interested. I will also make baffle variant without integrated driver for everyone that don't want to mess with it. Well that's a lot of promises but I think it will happen. Its just that I dont have much free time so it will take a while.

 

Thanks to everyone, and sorry tor chaos

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphones (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphones (full-size) › Just listened to some Fostex T50RPs today... WOW!