Do you need to keep these covered to protect from dust?

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Starfall119
46
Mar 16, 2021
They have two foam covers over either side of the stators and driver membrane. So they aren't as defenseless to dust as Stax or other Electrostats.
ihtrq
72
Mar 29, 2021
I'm pretty sure most Stax use some kind of PVC filter across the drivers. Or that's what I'm told. It's the ESP/950s which are apparently infamous for getting dust inside them. Thus, why it's so common for people to advocate using Koss' lifetime warranty.
NotDai
31
Apr 11, 2021
A redditor once did a teardown, and there actually is a crumpled mylar film it seems. That said, people like the dude who makes Nectar estats says in his experience operation without dust protection is fine... and foam suffices as sufficient protection when not in use or in use too (see the FAQ for Nectar). My personal hypothesis is that Koss's issue is not external dust, but dust from production trapped with the driver and messing with it. My first unit was faulty out of box and for two weeks no tapping, blowing, etc would resolve the persistent squealing in only the left side. My replacement is perfectly fine. Squealed a bit on start up, but a tap solved everything since then. Have left it uncovered for about two months without any issue, though I still do cover it now just in case I am wrong. The internal dust issue is still worrisome, but I don't think external dust is much of a worry really.
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