Magfan, there are three types of drivers Magnapan employ in their speakers. First is the true ribbon tweeter. This has a thin aluminum foil that is suspended on its ends (top and bottom). The magnets flank the tweeter foil so there is nothing to get in the way of the sound front and back of the tweeter foil. Note there is no mylar in tweeter, just aluminum alloy.
The quasi ribbon driver is not a true ribbon driver as defined above. This driver has flat ribbons of aluminum that has been bonded to mylar by glue, and the driver is attached and tension on all four sides, not just the top and bottom as in the true ribbon tweeter. Also, the magnet array is located either on the front or back (or both) of the driver, not on the sides like the true ribbon tweeter. The sound comes out of slots between the magnet array. So the magnet array does get in the way of the sound to some extent. It is still a planar magnetic driver and can be used for tweeter, midrange, and bass applications. The quasi ribbon should be less prone to delamination and is essentially the same as the driver used in Eminent Technology speakers.
The traditional round wire bonded to mylar planar magnetic driver is their oldest technology driver, and has been known to delaminate. It too has magnet array either in front or back (or both) of the driver. It has been used for tweeter, midrange, and bass application as well. But the wire is heavier than the ribbon foil used in the quasi ribbon drivers. Whether wire driver sound better than the quasi ribbon driver is still up to debate if you search the forums. Some feel the wire driver is better for bass application.
