3 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Constant black noise in right earbud in hear-through and ANC modes
Owner of a third pair of Jabra earbuds reports persistent black/static noise in the right earbud in both hear-through and ANC modes; firmware reinstall did not fix it and customer support was unhelpful. The reviewer notes this appears to be a common issue online.
What to check. If you buy these, test ANC and hear-through modes on both earbuds within the return window; a defective unit may show static noise in one bud that firmware cannot fix.
Loud high-pitched ringing noise in both earbuds after ~4 months
Best Buy customer reports a loud high-pitched ringing noise from both earbuds starting about 4 months after purchase — beyond the return period. This is a hardware failure that appears after the return window closes.
What to check. The failure emerged after the return period, so check warranty coverage (Jabra typically offers 2 years with registration) and test thoroughly early; a ringing noise at ~4 months means you may need a warranty claim.
CHIP.de's professional test notes that while ANC effectively reduces bass and midrange noise, a residual hissing/static (Rauschen) remains audible in the treble range. This is a professional measurement-based observation, not an owner complaint.
What to check. If you are sensitive to high-frequency hiss, note that ANC does not fully eliminate treble noise; this is a characteristic of the ANC implementation rather than a defect.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Premium earbuds catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
