[Unused] YAMAHA NS-1000M Bass Reflex Conversion Kit - Matte Black Painted

Thank you for looking.
This is a bass reflex conversion kit to enhance the bass of YAMAHA NS-1000M speakers.
This product is a reproduction of a plan by Tetsuo Nagaoka to convert the YAMAHA NS-1000M into a bass reflex system to enhance its low frequencies. It is a kit that allows you to easily convert the original speaker box into a bass reflex speaker box with minimal damage. It is also easy to return to the original configuration.
I purchased this a few years ago from Biondo Kobo. I painted it with matte black spray and prepared it, but I ended up not using it, so I am selling it.

- Product Name: YAMAHA NS-1000M
  Bass Reflex Conversion Kit
- Condition: Unused
- Accessories: Mounting screws, data CD-ROM
  (Tetsuo Nagaoka's bass reflex conversion plan documents,
  NS-1000M instruction manual, etc.)

Please consider it.