http://www.ambertech.com.au/feature.php?articleID=523§ionID=1 according to the specs..basically the 4060/4061 in a big body.. and more stand friendly.... look like earthworks....
i saw /heard about these.. and thought it was interesting..also hear that the new mini cardiod is getting closer to becoming a reality...
manual for 4090/91 (http://www.ambertech.com.au/files/articles/4090_Manual.pdf)