This is an upgrade for any Fostex T20rp, T40rp or T50rp.
It takes the diaphragm from the stock metal box it is usually contained in and opens it up, allowing it to play sibilance free and with a more even pressure across the entire diaphragm reducing distortion. This mod also fixes the rattling some people experience with the stock driver.
You can either choose to send in your personal pair to be modified or I can purchase a pair and modify it for you before shipping to you.
This mod allows for an entirely different tuning experience compared with the stock driver.
If you have any questions about this mod feel free to contact me as I would be happy to answer them.
*When sending your own pair, please include your order number, email and return address in the box. Once ordered I will send you a message with my address.