Stax SR-X9000 vs Stax SR-009S
Both are electrostatic open-back headphones.
The SR-X9000 is 9 g lighter, at 432 g against 441 g.
Both run on an electrostatic energizer, so either one works with the amplifiers listed below.
The SR-009S lists for $1,655 less.
$6,200
$4,545
Side by side
SR-X9000SR-009S
- Driver
- Electrostatic
- Electrostatic
- Diaphragm
- Ultra-thin super-engineering plastic film, area 20% larger than SR-009S
- Ultra-thin super-engineering plastic film
- Driver size
- Not published
- Not published
- Enclosure
- Open-back
- Open-back
- Weight
- 432 g
- 441 g
- SR-X9000 is 9 g lighter
- Impedance
- 145 kilohms
- 145 kilohms
- Sensitivity
- 100 dB / 100 V r.m.s. at 1 kHz
- 101 dB / 100 V r.m.s. at 1 kHz
- Power for 110 dB
- Energizer
- Energizer
- Drive
- Needs an energizer
- Needs an energizer
- Frequency response
- 5 Hz – 42 kHz
- 5 Hz – 42 kHz
- Made in
- Japan
- Japan
- Released
- 2021
- 2018
- List price
- $6,200
- $4,545
- SR-009S is $1,655 less
From each maker’s published figures; sources are on each headphone’s page. Power for 110 dB is worked out from sensitivity and impedance.
Amplifiers that drive both
How the matching worksEvery electrostatic amplifier in the index drives both.
Where to buy the SR-X9000
List $6,200
Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works
Where to buy the SR-009S
List $4,545
Retailer prices checked 2026-10-21. We may earn a commission on purchases. How this works