Fostex T50RP Incremental Mods and Measurements
Dec 3, 2016 at 1:25 PM Post #2,251 of 2,766

bluemonkeyflyer

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  I tried that and unfortunately it didn't help. In fact, I now can't get a connection between the leads. I'm guessing it's the break on the left blemish. Is there a way to bridge that gap? Maybe carefully tape it off and paint a conductive material over the break? Or would that mess with the impedance? 

Looks like you may have a small puncture on the lower left side and the lower middle section. If so, adjacent traces may be shorted. Difficult but not impossible to repair.
 
Dec 3, 2016 at 5:29 PM Post #2,252 of 2,766
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I tried that and unfortunately it didn't help. In fact, I now can't get a connection between the leads. I'm guessing it's the break on the left blemish. Is there a way to bridge that gap? Maybe carefully tape it off and paint a conductive material over the break? Or would that mess with the impedance? 


If you have lost continuity there is no practical way to repair the driver....
 
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Dec 4, 2016 at 4:45 AM Post #2,253 of 2,766

xtenglong

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I'd like bring out vocals and guitars more on my MK3's. Would mods directly on the backside of the driver help with this? I'm not too sure what those mods actually do to the sound signature. Are they easily reversible? I'm afraid damaging the stock white dampening on the driver if I stick felt on top of it and then try to remove it if I don't like how it sounds. 
 
Dec 4, 2016 at 1:00 PM Post #2,254 of 2,766

c61746961

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Yep, that's the way to go. Just don't stick anything onto the dampening paper, stick it around, over the driver assembly. I'd try to get my hands on stiff felt and a hole puncher, I'd try a square of 2mm stiff felt with a hole punched, aligned with the hole on the stock paper. This will reduce the bass as well.
 
Dec 4, 2016 at 2:23 PM Post #2,255 of 2,766

bluemonkeyflyer

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  I'd like bring out vocals and guitars more on my MK3's. Would mods directly on the backside of the driver help with this? I'm not too sure what those mods actually do to the sound signature. Are they easily reversible? I'm afraid damaging the stock white dampening on the driver if I stick felt on top of it and then try to remove it if I don't like how it sounds. 

Read page 1 in this thread for numerous ideas to try, a description of the typical results from various modifications, and tuning tips.
 
Note: these mods were applied to T50RP mkII, not mkIII. Trial and error testing of these methods with mkIII will be necessary given the changes Fostex made to mkIII:
 
1 of 9 rear grids has the white paper cut out
controlled venting of the baffles 
venting on the ear side of the baffles via side slots where the lip of the pads are installed
 
 
Do not apply tape directly on the white dampening paper. If you do, the glue will eventually liquify and foul the white paper's damping properties. Instead, temporarily secure the felt with strips of tape around the perimeter forming a "picture frame." This is shown on Page 1 and this method is totally reversible. Once you settle on a modification scheme, you can permanently secure the felt over the back of the driver with a bead of hot glue all the way around the edges of the felt and driver frame.
 
Stiff felt seems to work better than soft felt. If you don't have stiff felt, try a double layer of soft felt.
 
I don't think plasticine, Newplast, or Dynamat are worth the expense and effort and they are difficult to remove.
 
The most bang for the buck sound quality modifications are:
 
pads
modifying the 4 cup vents
adding various dampening materials including cotton, felt, fiberglass, wool, and/or rockwool
 
Dec 4, 2016 at 3:59 PM Post #2,256 of 2,766

xtenglong

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Are the drivers prone to rattling for deep bass, or is it mainly for the MK3 now that they cut out a grid on the driver allowing more air to move? I've had an issue with my left cup rattling and a bit on my right when the volume is turned up. I just exchanged it but the problem is still there. I just tried loosening the screws and tightening the screws holding the driver together. It helped a little bit, but the problem is still there. I'm using an O2/ODAC, no gain, and the rattling starts before I'm in the 12 o'clock position. Would Newplast around the drivers to hold down any direct vibrations help?
 
Dec 4, 2016 at 4:43 PM Post #2,257 of 2,766

bluemonkeyflyer

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  Are the drivers prone to rattling for deep bass, or is it mainly for the MK3 now that they cut out a grid on the driver allowing more air to move? I've had an issue with my left cup rattling and a bit on my right when the volume is turned up. I just exchanged it but the problem is still there. I just tried loosening the screws and tightening the screws holding the driver together. It helped a little bit, but the problem is still there. I'm using an O2/ODAC, no gain, and the rattling starts before I'm in the 12 o'clock position. Would Newplast around the drivers to hold down any direct vibrations help?

 
I've replaced diaphragms for several people whose headphones rattled. In each case, the diaphragms were warped making a sort of hump which moves the diaphragm closer to the magnets on one side. I think the rattle is caused by the hump vibrating against the magnets when there is a lot of bass producing greater diaphragm excursion.
 
I don't think adding Newplast or similar material will have any effect but there's only way one to find out.
 
Loosening and retightening the screws holding the two driver frames together won't accomplish anything. There are 2 snap tabs on either side of the driver frames that prevent fatigue and loosening of the driver frame screws/threads. The two sets of neodymium magnets, one set on either side of the diaphragm, repel one another. Think of the driver screws and snap tabs as redundant systems that keep the two driver frames from flying apart.
 
Dec 4, 2016 at 9:17 PM Post #2,258 of 2,766

xtenglong

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The rattling on the left side stopped now after playing with the screws. There still is rattling on the right side. I'll see if I can get rid of it by playing with the screws more. I think the tensions on the screws weren't evenly distributed, so I'll try tightening them in a star pattern.
 
I'm having a tough time believing that two headphones in a row would have the same defect, on both ear cups every now and then. There are a number of people in the MK3 thread that had the same issue but it went away after modding. My hypothesis is that since one of the grid has been cut open, more air is flowing through so the diaphragm is moving more. The rattle isn't that bad, I just notice it on songs like Gesaffelstein - Destinations. I've been testing the headphones with a bass shaker test now.
 
EDIT: Just got home, played around with the screws again. Can't seem to fix the rattle on the right side, so I guess I'll try to exchange it again.
 
Dec 5, 2016 at 4:58 AM Post #2,259 of 2,766

leeperry

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  I've replaced diaphragms for several people whose headphones rattled. In each case, the diaphragms were warped making a sort of hump which moves the diaphragm closer to the magnets on one side. I think the rattle is caused by the hump vibrating against the magnets when there is a lot of bass producing greater diaphragm excursion.
 
I don't think adding Newplast or similar material will have any effect but there's only way one to find out.
 
Loosening and retightening the screws holding the two driver frames together won't accomplish anything. There are 2 snap tabs on either side of the driver frames that prevent fatigue and loosening of the driver frame screws/threads. The two sets of neodymium magnets, one set on either side of the diaphragm, repel one another. Think of the driver screws and snap tabs as redundant systems that keep the two driver frames from flying apart.

 
Dang you nail it! I got the *exact* same problem on a YH100 driver: http://www.head-fi.org/t/824322/
 
It plays everything nicely but loud deep bass makes the driver give physical BZZZ BZZZZZZZ noises as if it were touching something it's not supposed to. 
 
Guess I'm SOL? 
devil_face.gif
 
 
Jan 4, 2017 at 9:56 AM Post #2,260 of 2,766

edges7z

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Anyone got spare parts I could buy in the US? Just super simple I'm in need of a pair of replacement:
 
"Screw, PTP4 x 12, CZn" - 8914104062 & "Hanger Holder, Front, T-20RP/50RP" - 1412000401.
 
As seen here http://cdn.head-fi.org/4/4a/1000x500px-LL-4a8f31b4_FostexT50RPExplodedParts.png
 
Two of each. I ordered a ZMF headband pad to replace the suspension headband that comes with the Mad Dogs. Turns out when MrSpeakers adds the suspension headband they change out the stock screws with ones slightly longer to accommodate for the thickness of the suspension headband. I unscrewed them, took off the headband, and re-screwed them and they started poking a hole through the other side of those front hanger plastic pieces. My own stupidity for not going slow. Now I'm afraid to screw any further if stuff's gonna go falling apart. The aluminum U earpiece hangers don't hold place anymore due to this, they just fall.
 
But yeah if anyone has replacement screws and hanger holder pieces I'll pay for em! PM me and I'll get you back
 
Jan 4, 2017 at 4:41 PM Post #2,261 of 2,766

bluemonkeyflyer

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  Anyone got spare parts I could buy in the US? Just super simple I'm in need of a pair of replacement:
 
"Screw, PTP4 x 12, CZn" - 8914104062 & "Hanger Holder, Front, T-20RP/50RP" - 1412000401.
 
As seen here http://cdn.head-fi.org/4/4a/1000x500px-LL-4a8f31b4_FostexT50RPExplodedParts.png
 
Two of each. I ordered a ZMF headband pad to replace the suspension headband that comes with the Mad Dogs. Turns out when MrSpeakers adds the suspension headband they change out the stock screws with ones slightly longer to accommodate for the thickness of the suspension headband. I unscrewed them, took off the headband, and re-screwed them and they started poking a hole through the other side of those front hanger plastic pieces. My own stupidity for not going slow. Now I'm afraid to screw any further if stuff's gonna go falling apart. The aluminum U earpiece hangers don't hold place anymore due to this, they just fall.
 
But yeah if anyone has replacement screws and hanger holder pieces I'll pay for em! PM me and I'll get you back

 
Are you sure about the screw? Do you need the Front Hanger Holder Ref No. 8... or Connector B Ref No 5?
 
The Front Hanger Holder Ref No. 8 needs the screw with Ref No. 20.
 
The Screw with Ref No. 21 secures Connector B, Ref No. 5.
 

 
Jan 4, 2017 at 8:23 PM Post #2,262 of 2,766

Pars

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I haven't been paying attention to this thread for quite some time; looks like a lot of posts since I have :)
 
What is considered to be the best mod package these days for a pair of T50RP MkII? I have 2 modded pairs (both done by my brother), and wanted to update one of these. Is DBV #3 still considered to be the place to start?
 
Thanks!
 
Jan 4, 2017 at 11:16 PM Post #2,263 of 2,766

SeEnCreaTive

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  I haven't been paying attention to this thread for quite some time; looks like a lot of posts since I have :)
 
What is considered to be the best mod package these days for a pair of T50RP MkII? I have 2 modded pairs (both done by my brother), and wanted to update one of these. Is DBV #3 still considered to be the place to start?
 
Thanks!

 
 
Start with the basics. Rear side damping, foam, and cotton. Easy, cheap, reversible. Those will change the sound more or less the most. You can always change what style to do, and continue to add in the future
 
Jan 5, 2017 at 2:12 AM Post #2,264 of 2,766

GREQ

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  What is considered to be the best mod package these days for a pair of T50RP MkII? I have 2 modded pairs (both done by my brother), and wanted to update one of these. Is DBV #3 still considered to be the place to start?

My humble opinion:
http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements#user_nick_n_Memory_Foam_Modification_November_2013
http://www.head-fi.org/t/729146/the-nickerfied-fostex-t50rp-impressions-and-mod-thread
 
But with driver variations being what they are, I wouldn't recommend this mod if the treble is already quite strong in stock form.
 
Jan 5, 2017 at 7:56 AM Post #2,265 of 2,766

rikk009

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  My humble opinion:
http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements#user_nick_n_Memory_Foam_Modification_November_2013
http://www.head-fi.org/t/729146/the-nickerfied-fostex-t50rp-impressions-and-mod-thread
 
But with driver variations being what they are, I wouldn't recommend this mod if the treble is already quite strong in stock form.

I was looking for similar mod. MK2 has subdued treble unlike what I hear about other models.
 

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