I will cut to the chase with this one.

KZ ASF is an IEM I cannot recommend under any circumstances. KZ usually gets things somewhat right but this is a turd that you can’t polish, and anyone who tells me otherwise will only get a stern stare filled with disappointment and disbelief.

KZ ASF is one of the new/refreshed models from KZ and apparently it replaces the AS10… or something like that among the dizzying array of IEMs they’ve released over the past three years.
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Continue here:
https://www.audioreviews.org/kz-asf-review-kmm/