[sdiy] Reverb opinions, please

[Ian Fritz]

At 09:53 AM 5/20/2004, john mahoney wrote:
>Seems like a compression driver (for a horn midrange or tweeter) would work
>well with a spring, if you could attach the spring to the diaphragm.
>
>And how about a piezo driver? Cheap, rugged, and you can epoxy* something
>directly to it. The bass response is poor but might be okay if you keep the
>signal level fairly low.
>
>In theory, you can use a piezo on each end -- one as driver, the other as
>pickup. Frequency response anomolies could be accentuated, though, so this
>may be a Very Bad Idea (TM).


We had a protracted argument about this a couple of years ago.  Reverb 
springs are driven in torsion mode, not longitudinal mode, which is what 
you are suggesting.