[Peter Wieck[_2_]]

Three things:

a) ES Speakers, as a class, really do not like humidity.
b) ES Speakers, as a class, really do not like polluted air, especially particulate pollution.
c) AC, properly sized in capacity, reduces both significantly.

Prescription:

i) DO check HV level.
ii) DO check the connection(s) to the Mylar panels.
iii) Exceedingly carefully: Do clean the panels and connections.

Particulates build up on the Mylar panels as many of them can carry a charge - and, in part, how electrostatic air cleaners work. They will also build up on the connection(s) and cause corrosion. Add humidity to the mix, and things get infinitely worse.

Put another way, if one wants planar speakers in any climate that is not either naturally dry *and* free of particulates, or maintained as such 24/7/365, go with Maggies.

Peter Wieck
Melrose Park, PA