I use a Kisiki de mag on my Koetsu Rosewood, just as I did with my (previous) Benz Ruby 2.
Moving coil cartridges do not require treatment as frequently as moving magnet designs. No more than 20 seconds of de magnetism every two to three months is sufficient.
As to requiring demagnetizing more frequently after having done it once?
There is a change in the tonal balance, dynamics and staging of a Benz and Koetsu immediately after demagnetizing. This is followed by several days of waiting for the cartridge to break in or "settle" to best sound again.
Perhaps your friend does not like waiting through this interim period and prefers the sound of his cartridge having been recently de magnetized. This may prompt him to continually repeat the process.
When I had a Benz Ruby 2, there was a time when I got caught up in the frequent demagnetizing. The high frequencies are soft and diffuse immediately after treatment and as with all settling in periods, the sound immediately after that is not as comfortable. Waiting a bit longer will net you sound as it was when new and fully broken in.
Moving coil cartridges do not require treatment as frequently as moving magnet designs. No more than 20 seconds of de magnetism every two to three months is sufficient.
As to requiring demagnetizing more frequently after having done it once?
There is a change in the tonal balance, dynamics and staging of a Benz and Koetsu immediately after demagnetizing. This is followed by several days of waiting for the cartridge to break in or "settle" to best sound again.
Perhaps your friend does not like waiting through this interim period and prefers the sound of his cartridge having been recently de magnetized. This may prompt him to continually repeat the process.
When I had a Benz Ruby 2, there was a time when I got caught up in the frequent demagnetizing. The high frequencies are soft and diffuse immediately after treatment and as with all settling in periods, the sound immediately after that is not as comfortable. Waiting a bit longer will net you sound as it was when new and fully broken in.