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He is a great engineer of electronics & speakers.
The relation of Locanthi & Shozo Kinoshita is told in this web.
http://www.reyaudio.com/history-e.html
TAD TD-4001 is developed by Pioneer company...

The crossover frequency is 425Hz. It will be impossible exchange only capacitors, you need also exchange choke coils & base board.
So Kinoshita will say that you should exchange RX-21 to RX-21A...

Dear sir

Unfortunately, the "Magical Super Studio" (at Aoyama Japan, near JVC Aoyama studio) was already closed over 10 years ago.
But you can hear and see all of Shozo Kinoshita (my friend) at...

Hello. I ever gone there and heard the great sounds.
The ribbon tweeters were over 6 units and taken around speaker system.

http://www.sente.ch/shimi/Page10.html

I own four JDF HQS3200UPM...