Hello Mr. Legarda,

the original intention was to find an improved successor for the U87, in the long term. But, we always find it rather difficult to discontinue a microphone, and tastes are subjective, so both mics are still alive and kicking.

The link guides to an article (in German) published on the introduction of the U89, in 1980:
https://www.neumann.com/download.php?dow nload=lect0039.PDF

Best regards,
Martin Schneider / Neumann Mic. Development