Over-earReferenceNeeds amp

Stax SR-009S

9.2

/ 10

Specifications

Impedance

450 Ω

Sensitivity

94 dB/mW

Type

Over-ear

Amp required

Yes

Score by configuration

No amplifier

5.5

Portable amp

8.5

Desktop amp

9.2

Max score assumes optimal full audio chain.

Analysis

The Stax SR-009S is a reference over-ear with 450Ω impedance and 94dB sensitivity. At 450Ω, these headphones benefit significantly from a dedicated amplifier. Without one, volume and dynamics are noticeably limited — you're leaving performance on the table.

Your audio source matters more than most people think. Spotify High Quality is fine for casual listening, but with FLAC files or lossless services like Apple Music or TIDAL you'll hear a clear improvement — especially with reference headphones like these.

Own the SR-009S?

Find out if your DAC, amp or source is limiting your sound.

Analyze for free →

Compare SR-009S vs

Similar headphones