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The Stax SR-40 is a vintage electret electrostatic headphone system (with SRD-4 adapter) from the 1970s, featuring a 6-micron diaphragm for surprisingly detailed, airy sound, requiring an energizer or speaker amp, offering a Stax quality with an adjustable headband, soft vinyl pads, and a classic design, known for its balanced sound and good value.

Specifications:
Type: Electret Electrostatic "Earspeakers" (Headphones).
Diaphragm: Ultra-thin (6 microns), providing fast transient response.
Frequency Range: 25 Hz - 25,000 Hz.
Adapter: Comes with the SRD-4 adapter to connect to speaker terminals of an amplifier.
Sound Profile: Balanced, slightly accentuated midrange, airy treble, good detail, and linear bass.
Design: Open-back, over-ear with a black/silver cup finish and soft vinyl ear pads.
Connectivity: Uses standard speaker wire connections via the SRD-4 adapter.
What's Special About It?
It was Stax's first affordable electrostatic headphone, allowing broader access to their unique sound quality.
It requires a dedicated Stax energizer or the SRD-4 adapter for use with regular amplifiers.