[Scott Dorsey]

wrote:
when I tried them i found that above a few hundred Hz, the foam cushions did all the noise isolation.

The active electronics works in the bass region only which is OK because thats where the foam needs the help.

The combination of the foam and electronics did work together pretty well.

Right. And most of them use the same cheap chipset for the active
electronics, so it doesn't make a huge difference between them. So,
unless you're going to buy the David Clark or Bose stuff, pick the ones
that have the best foam padding.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."