Fostex T50RP – Mod kit

4.5 out of 5 based on 4 customer ratings
(4 customer reviews)


SKU: 0005

Our Fostex modification kit gives you the necessary materials to perform most modifications to your set of headphones.


  • Roughly 25 grams of Newplast Clay
  • Stick on soft and stiff felt
  • SilverStone Dampening Foam
  • Rolled Cotton

This mod kit will work on all version of the Fostex Mk2 and Mk3 series of headphones. With the Mk3 headphones we have a material upgrade for the inner baffle foam. With our testing we have found our material provides a boost in sound quality and is easily installed. They are precisely with a special die and will drop right in.

See our YouTube video on our modification guide here – https://www.youtube.com/watch?v=LSFZ1NKHS1A


Weight 0.625 lbs
Add Baffle Upgrade

Yes, No, Stand Alone

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4 reviews for Fostex T50RP – Mod kit

  1. 5 out of 5

    (verified owner):

    Not much to say here, basically if you wanted to gather all these materials any other way you’d spend more and most likely have to order from a variety of stores. The materials are all as described and the shipping was pretty fast for a private company.

  2. 4 out of 5

    (verified owner):

    Purchased this kit including the baffle upgrade. Here are my thoughts after spending about an hour and a half getting everything installed according to the YouTube video guide. First off, you’ll want to note that the video is mirrored for some reason, so left is right and right is left on everything (“FOSTEX” reads backwards in the video). So when punching holes in the stiff felt you’d need to reverse everything the video shows, and then “mirror” your first set of holes for the right driver’s felt…confused yet? You should be. Anyway, the rest of the install is pretty straightforward. The most tedious part of the whole process is getting the soft felt and foam trimmed to fit properly on the inside of the cup. Templates would help here. None are included. It would be very easy for Mayflower to trace their existing cutouts on an 8.5×11 sheet of paper and just make photocopies to include with the kit. When I got everything put together and listened…uh oh…..no bass. Read a few of the YouTube comments and others experienced the same result. Removing the stiff foam from the back of the drivers brought it back, and I also ended up using about half as much of the cotton as I originally has put in. The end result is a very neutral sounding headphone. Gone is any harsh peaks in the highs that existed before. I’ve been going back and forth with my HD600’s and I would say that the frequency response is now extremely similar and flat. The V1’s have a tad bit more bass than the 600’s (and the planar speed), a little less detail less detail than the 600’s, better imaging than the HD600’s, and an improved sounstage over stock but still not super wide. If I were to do this over again, I’d just make one mod at a time, in order of ease/intrusiveness. So first I’d first try just the baffle upgrade. Then I’d try the foam strips/ladders to the inside cup, then the clay on the baffle. That way, the headphones can really be customized to your preference. The way I did the mod, I don’t really know what effect each step made in changing the sound. But overall, I’m very pleased with my results, and my T50rp mk3’s are no longer fatiguing in any way.

  3. 5 out of 5

    (verified owner):

    I just received the kit in the mail. It looks like Mayflower listened to Seth above because the cutout templates have been roughly traced onto an 8.5×11 sheet of paper to make the process even easier. That is super awesome of them. It definitely comes with enough material. I could mess things up and still have spare to redo some. All these materials (besides the upgraded baffles) have been used in many mods so it is nice that they sell an entire kit to make it much easier and even less wasteful since i won’t have to buy more than i need.

  4. 4 out of 5

    (verified owner):

    A little background: I’ve been listening to the mk iii’s for about a year now with the Shure HPAEC1540 pads and a deerskin leather suspension band from mod house audio (http://www.modhouseaudio.com/). One of my favorite headphones especially for the price. The mids are great stock. I’ve never experienced fatigue in highs (but that’s just my ears). They lack low end. After the mod from mayflower; I couldn’t put my finger on what changed right away. After a day or so of use I started to notice some increase in the low end clarity. Let me be clear this headphones will never have a lot of low end bass. The Mk iii’s are limited to their orthodynamic driver size but, the mod kit helps bring out the low end just a little bit. The sound stage I believe is a little better as well. This mod won’t change what these cans are. This mod will however make them be the best they can be and I’m really happy with the change. I’d recommend highly especially for the low price of what the mod costs. I was looking for a brand new headphone but after the mod I think I’ll just hang on to these a little bit longer and prolong my search for a new pair of cans. Good job Mayflower, this is an objective better pair of headphones now. Thank you!

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