I think this black paper version is the best match for driver and housing. 580(black paper) was quite unstable (great performance driver and quite loosing cans) something small vibrations others occurred. But hd600 black paper was best match for driver and house. Wonderful one… This is such a...

Legendary HD600(black paper screen) driver.

Amazing!! I think CTX-1 is a flagship for Napolex.. They did more dampings and interesting structures for their cans. But CTX-3 was not, they just put drivers in their cans. Very interesting driver materials. Thanks for your wonderful job :)

Audiotechnica’s TOTL model in1970s AT706 driver.

Amazing pics!! Pioneer always make a amaze builds... but their sounds are not impressive..... A8 also have great build amazing! I love it

Great! However, I am a bit disappointed... The cans are missing dampers.

Sennheiser unipolar 2000

Driver of DUAL DK330 May be one of the earliest orthodynamic driver. But left one was dead..

I saw your pics. It seems to be very simmilar to mine. The sound stage of M9's was not much wide than current models, but the sound stage level was simmilar to other monitor's I think its midrange was so beautiful... I shares simmilar sound signatures to other audio-technica monitor models

Interesting! I have CTX-1 mk1 also, but driver seems to be bonded to housing very sticky.. So I gave up :( I'm looking forward for your job!!

Another first driver pic ever:) Napolex CTX-3 I think CTX-1 is much better. They said this are carbon coated driver.

I think difference is just changing magnets. Audio-technica changed magnets to neodymium. Dynamic range was extended. I read some reviews for m9 and m9x, they have similar sound signature. I think they have similar relationships to sony mdr cd900/cd900st

Maybe first driver pic ever! ATH M9 (1987)

Hi guys I received ath m9 today. Sound stage is small but bass is deep and vocal sound is amazing. But some times bass blind the midrange. Sound signature is very similar to nowadays audio-technica woods. interesting :)

Seller didn’t sent me a product yet. It will takes a week. I will update my inspiration:)