John,

This 'unidentified interference' you speak of may be what I am experiencing with my set-up.

I am using a Sony condenser lapel mic with my Sony VX2100. Presently I am just using an XLR to mini-jack converter - though I have a Beachtek unit on the way from the States.

When I use the remote control unit to zoom in and out, there is a distinct clicking interference through the headphones - and also audible on playback through a monitor.

Might this balanced to unbalanced conversion account for the noise?

Dave