Sennheiser HD 490 PRO
The Sennheiser HD 490 PRO is a wired, over-ear open-back studio headphone with dynamic transducers, intended for mixing and mastering. It uses the manufacturer's Open-frame Architecture and a low-frequency cylinder system, ships with two interchangeable ear pad sets (mixing and producing), a detachable cable, and 3.5mm and 6.3mm connections.
| Frequency response | 5 Hz – 36 kHz |
| Sensitivity | 96 dBSPL (1 kHz/1 mW) |
| Sensitivity | 105 dBSPL (1 kHz/1 Vrms) |
| Impedance | 130 Ω |
| THD | 0.2% |
| Dimensions (W × H × D) | 241 × 77.5 × 245.7 mm |
| Weight | 260 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 | 1.8 V · 24 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 105 dB/V and 130 Ω — not a listening test. DAC/amps on the shelf →
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