The ZYX cartridge can be ordered with additional mass supplied by a silver base which makes it compatible with the JMW-9 arm. Otherwise, the ZYX is much too light for the JMW-9 arm. I've read that some folks are very happy with the result. I use Benz and Dynavector carts, so I have no first-hand experience with the ZYX.
Cheers.
Cheers.