Mr. Yoichi Tada showed his tuba speaker system.
Yoichi-san built this unique speaker based on Sakuma's instruction after many trials.
The tuba with Western electronic driver is mounted in the box. The 30mF oil capacitor is employed as a high cut filter for the driver.
The wooden plates of the box are built with 9mm thick plywood made of Japanese white wood.
The construction of this box was made very carefully so that the beautiful sound of tuba would not be spoiled.

There were more than 70 people at the concert.
Since Ninnaji has contributed greatly to Japanese traditional arts, such as Ka-do (flower arrangement), Sa-do(tea ceremony), and potteries, some specialists of those arts were found among the audience.