DT 990 Pro 250 Ohm
Wired over-ear headphones with no battery to age; particularly valuable for long-term and repairability data.
auto-translatedDesign strengths: with no battery, the most common reason for ageing disappears entirely — lifespan is set by the mechanics and the spare parts, not by charge cycles; detachable cables and replaceable pads keep many models usable for decades; no firmware that can go stale or take features away.
Long-term points: cable, plug or socket, ear pads, headband padding and hinges; at high volume or after a fall, driver failure or imbalance is possible. Without a battery the potential lifespan is usually longer, and spare-part availability largely decides how repairable a pair is.
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