STAX - SR-009D - Earspeakers

The SR-009, the origin of STAX's current high-end models. Equipped with a large circular sound unit featuring innovative fixed electrodes, 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 is making a comeback. With changes to the body colour, cable material, and unit case, it is now available at a more accessible price than at its original launch.

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 the usability of the earspeakers by enabling future compatibility with high-quality cables and easy maintenance in case of unexpected cable breakage.

Specifications

• Type: push-pull electrostatic sound element, open-air type enclosure
• Sound element shape: large round shape
• Frequency response: 5 - 42,000Hz
• Electrostatic capacitance: 110pF
• Impedance: 145k
• Sound pressure sensitivity: 101dB
• Bias voltage: 580V DC
• Attached cable conductor: 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 (ear speaker)