correction Frame IS metal.. coated with plastic. Doh


They don't have a screen.
The vent in the back is about 1 inch.
The bump in the back is about 3.5" across and is raised about 3/8".
If I stick my finger down in the vent, there is some foam about 2.5" down.

ok, I attacked one with a knife, The Frame is Metal, but it is coated in a thin layer of black textured plastic(ABS?). I guess this is to cut down on resonance, cause it sounds like plastic when you tap it.



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