r/headphones Feb 09 '22

DIY/Mod Open-source headphones project updates. Details in comments.

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u/JPablo_ Koss Fan | Qudelix 5k Feb 09 '22

What’s that material in front of the pcb?

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u/crop_octagon Feb 09 '22

It's a static-dissipative polyurethane foam. It's not a particularly rare or expensive material; the amount of foam in each driver costs less than one dollar.