In Stock - Now Shipping!Updated: Dec. 16, 2025 STAX updates the SR-009 with the SR-009D, featuring a redesigned color scheme, a detachable cable, and lighter-weight unit case. We recommend our Blue Hawaii SE amplifier for the highest level of performance possible from these amazing headphones. The Legendary Model "009" is Back The SR-009D is the newest and most affordable entry to the 009 family. The SR-009 - the origin of STAX’s current high-end models - was equipped with a large circular sound unit featuring innovative fixed electrodes and this model led the high-end headphone culture for a long time. Production had ceased with the arrival of the new flagship model, but now, in response to numerous requests from fans worldwide, it makes a comeback. With changes to the body color, cable material, and unit case, it is now available at a more accessible price than at its original launch. The 009 MLER (Multi-Layer Electrode) The SR-009 (released in 2011) was the catalyst for the current high-end models SR-X9000 and SR-009S. The key technology for high-end models, MLER (Multi-Layer Electrode), originated with this model. Using thermal diffusion bonding technology, which unifies photo-etched metal plates at the atomic level under vacuum conditions, this new fixed electrode achieves exceptional planarity, low resonance, and high sound wave transmission. The SR-009D remains the most affordable option for experiencing the sound of current STAX high-end models. Replaceable Cable Design SR-009D adopts the replaceable cable structure which is now standard across the current lineup. This enhances usability of the earspeakers by enabling future compatibility with high-quality cables and easy maintenance in case of unexpected cable breakage. SPECS -Type: push-pull electrostatic sound element, open-air type enclosure -Sound Element: large round shape -Frequency Response: 5-42,000Hz -Electrostatic Capacitance: 110pF -Impedance: 145k Ohms -Sound Pressure Sensitivity: 101dB -Bias Voltage: 580V DC -Attached Cable Connector: OFC -Cable: parallel 6-strand, low-capacity wide cable -Cable Length: 2.5m -Ear Pad: genuine sheep leather (skin touching portion), artificial leather (surrounding portion) -Weight: 452g
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