Akg K400
Nov 26, 2022 at 8:58 PM Post #393 of 394
Ok, on which page?
It's unfortunate that you got such a useless response, here is a slightly more useful post to start from
It's been mentioned by me and others in various K400/K500 threads. It's a presence/treble filter. The rotting foam can be replaced, or the plastic holder removed if you prefer it without filter.
If you want to try looking in other K400/K500 threads and search "filter" that may get you more info

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