Sennheiser IE 900
The Sennheiser IE 900 is a wired in-ear monitor with a one-piece CNC-milled aluminum housing and a single 7 mm dynamic TrueResponse (XWB) transducer paired with the X3R triple-resonator chamber technology. It uses MMCX connectors and ships with interchangeable 2.5 mm, 3.5 mm, and 4.4 mm para-aramid-reinforced cables, sitting at the top of Sennheiser's IE series alongside the IE 200 and IE 600.
| Frequency response | 5 Hz – 48 kHz |
| Sensitivity | 123 dB |
| Impedance | 16 Ω |
| THD | 0.05% |
| Driver | 7 mm |
As stated by the manufacturer — not community data.
Plays straight from a phone
A phone or laptop reaches full listening level. An amp is a choice, not a requirement.
| Needs, for 110 dB peaks | 0.22 V · 3.1 mW |
| Phone or laptop (≈0.70 V, 20 mW) | Enough |
| Dongle DAC/amp (≈2.0 V, 120 mW) | Enough |
Worked out from the stated 123 dB/V and 16 Ω — not a listening test.
Three words is enough to start the page — warm or bright, lean or full, smooth or energetic.
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