Dan Clark Audio Expanse

The Dan Clark Audio Expanse is an open-back planar-magnetic headphone positioned as the company's flagship open-back model. It uses a 4th-generation planar-magnetic driver and the Acoustic Metamaterial Tuning System (AMTS), and is built with aluminum, titanium, and a carbon fiber baffle.
| Sensitivity | 90 dB/mW |
| Impedance | 26 Ω |
| THD | 0.03% |
| Driver | 76 mm |
| Weight | 418 g |
As stated by the manufacturer — not community data.
A dongle is enough
A phone's own output runs out early; a small USB DAC/amp gives it full level and headroom.
| Needs, for 110 dB peaks | 1.6 V · 100 mW |
| Phone or laptop (≈0.70 V, 20 mW) | Runs short |
| Dongle DAC/amp (≈2.0 V, 120 mW) | Enough |
Worked out from the stated 90 dB/mW and 26 Ω — not a listening test. DAC/amps on the shelf →
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