Horns vs Ribbons vs Dyanamic

Ah thanks Nsgarch. I didn't realize these things! Several questions:

1. I have seen pictures of so-called "horn drivers" that are outside of an enclosure; what does this mean?

2. What makes dynamic transducers different from electrostatic ones, and what are plasma?

3. I always thought of dynamic speakers as those that had traditional, cone-shaped drivers. If planar speakers like Magnepans are dynamic, I must not truly understand what dynamic speakers are. What are they?

Audiokinesis,

The single driver dynamic speaker that you mentioned had great imaging, did this happen to be an Ohm speaker?