I am looking for a "moving coil exciter" suitable for attaching to some
surface like a window glass. I want to turn a window glass into a
speaker. I don't want to achieve high sound pressures, but prefereably
be able to go down to ~35 Hz (at sound pressures quite low).
I guess signal processing and driving the exiter to it's limits is
necessary to achieve linear response down to 35 Hz.
I already have found the "soundbug" marketed as computer accessory. But
this is not what i am looking for as it is active and uses batteries. I
rather look for a passive solution which may be like a "speaker without
membrane".
Or may i be able to build such a thing on my own by buying some parts
used in a speaker ?
Where could i look for seperate speaker parts like the magnet & coil. I
could then try to attach the coil to some suction cup for attaching it
to a window.

Raymund Hofmann