Stax
SR-X9000
Introduced 2021$6,200 MSRP
Flagship push-pull electrostatic earspeaker with MLER-3 multi-layer electrodes and a large ultra-thin diaphragm. Requires a dedicated electrostatic energizer/amplifier with a 580 V bias supply.
MSRP
$6,200
Used market · Excellent
$4,500est.
-27% vs MSRP
as of Aug 16, 2026MSRP to used market
From $6,200 at launch to $4,500 today (estimated).
Specifications
- Type
- open-back electrostatic
- Driver
- push-pull electrostatic, MLER-3 electrodes
- Weight
- 432 g
- Bias voltage
- 580 V Pro bias
- Impedance
- 145,000 Ω
- Sensitivity
- 100 dB
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