1x Pair Fostex FE 138 SE R Drivers, New, Never Fitted.

Rare opportunity to aquire these collectors item.

https://www.madisound.com/store/manuals/FE138ES-R-1.pdf

Features

• The state-of-the-art hybrid material is offered to the diaphragm. Its ideal internal loss and stiffness bring the propagation velocity similar to the near-metal diaphragm.
• UDR tangential surround & spider are equipped to realize the less antiresonance and superior amplitude characteristic.
• Newly developed zinc die-cast frame based on the strength analysis by the fine-element method.
• Pure magnesium center cap is directly mounted onto the voice coil to make the diaphragm mechanical 2-way.
• The low strain magnetic circuit using the large alnico magnet brings the low distortion and rich midrange frequency reproduction.
• The normalizing processed pure iron pole piece is employed for highly transparent and natural sound reproduction in overall bandwidth.