I tried a pair once (I think Behr/Norton) in the 1970s that had a piston. I was in a very loud rock and roll band at the time. They didn't work well so I went back to what I was using before - if my memory serves me well it was foam.

Ever since I found the etymotics, I haven't had a need to look for anything else.

Insights and incites by Notes


Bob "Notes" Norton smile Norton Music
https://www.nortonmusic.com

100% MIDI Super-Styles recorded by live, pro, studio musicians for a live groove
& Fake Disks for MIDI and/or RealTracks