SR-Lambda Pro

Name: STAX SR-Lambda Pro
Brand: STAX

STAX

Lambda Series1982 – Present

HeadphonesOver-Ear HeadphonesDiscontinued

Estimated price (community-sourced)

$550

Around — community and catalog average, updates slowly

About the SR-Lambda Pro

The SR-Lambda Pro is an open-back electrostatic earspeaker introduced in 1982. It uses a 1.5 μm diaphragm and STAX Pro-bias operation at 580 V, with a five-pin connector; it requires a compatible electrostatic amplifier or energizer and is not a conventional headphone that can be driven directly from a standard headphone output. The manufacturer’s product history lists its 1982 launch at ¥32,000.

Specifications

Type: Open-back electrostatic earspeaker Diaphragm thickness: 1.5 μm Bias voltage: 580 V (Pro bias) Connector: 5-pin STAX Pro-bias plug Frequency response: 8 Hz–35 kHz (reported specification) Sensitivity: 100 dB SPL at 100 V RMS, 1 kHz (reported specification) Weight: approximately 340 g without cable Amplification: Requires a compatible electrostatic amplifier or energizer

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Pairs with

Components that show up alongside the SR-Lambda Pro in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.

STAX SRM-1mk2
Topping DX7 Pro

What an account is for

The specs and the pairings above are open to everyone. Sign up and you get the system builder, the assistant, a compatibility check against the gear you already own, and a watch on this product so a price or pairing change reaches you.

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