I used to have a squeal problem with my DCs. Since I wear glasses, it
was suggested that the seal is compromised and feedback can occur. It's
been a long while since I've flown so I don't recall if that was in fact
the problem.

Juan Jimenez wrote:
Somebody explain to me why ANR headsets squeal when you are descending from
FL180 and lower in an unpressurized aircraft. Flightcom is modifying their
Denalis to deal with this but they say all ANR's do this.

????

Juan