Hi Darryl,
I am not sure where your going with this inquiry but I would say a dyansonic "surround" is a metal or plastic piece that is applied over the pickup to cover any exposures resulting from the mounting process. However from what I see a Dynasonic is a surface mount pup so a surround is not required. On the other hand it could use a "mounting ring" which would normally be a shaped spacer inserts that get mounded between the pickup and the guitar and is used to adjust height.
The language is a bit precise when talking about a Dynasonic. If you were talking Filtertron pickup then they use a "surround" that gets installed over the pickup and it covers the exposed gap from the pickup installation. Similarly when looking at a recessed DeA model 2000 or 2k a thin chrome metal surround is used to cover the body route and installation.
If talking about a surface mounted DEA 200, 2000 or 2K then you would use a "mounting ring" made out of thin plastic. They come in thin flat and thick tapered styles and are used as spacers.
If you look at this even more as when the single coil pups that Guild used, like the Mickey Mouse and Soapbar, they used a bezel to mount to the guitar. A bezel mounts the pickup, allows for height adjustment and covers any exposures from the installation. Similarly Humbuckers are usually mounted with a bezel.
:?
M