As anyone who lives in the tropics will attest, a tropical environment is a challenge for electrostatic speakers, as for any high voltage apparatus, even including the mains power grid.
Right off the bat, because of this, I have to say that I'm sorry that we can't warranty our speakers for the usual five years in the tropics. That said, however, there are a number of attributes that should make them serve well for at least that long between services, which I believe is longer than other electrostatic speakers will keep working:
Lower operating voltages -- because cone woofers handle the bass frequencies, the bias voltage is only about 2000 Volts instead of 6000 Volts, and the drive voltages are commensurate
There's a protective barrier membrane over the working membranes
High voltage electrical nodes are coated with an insulating material
Hardware that won’t corrode (stainless steel, brass, copper, zinc, and polymer -- no steel)
Panels are inherently immune to trouble from repeated expansion/contraction caused by wide temperature variations
Speakers that are destined for the topics have anti-fungal treatment of grill cloth and wood
I am considering adding a feature for tropical service that consists of a small drawer in the back of the cabinet that holds desiccant packets that can be replaced or baked dry on a regular basis. If frequently enough attended to, this should extend the service indefinitely. There would be a modest extra charge.
There are pairs in Singapore and Hong Kong, but these might be in homes that are always air conditioned, so I can't necessarily hold these up as examples. In some tropical places, open widows are the norm, and as far as I know, no pairs of JansZens have been placed in such an environment.
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