Stax SR-007 MK2
Open-back audiophile headphones with electrostatic panels, the flagship of the Stax range, designed for transparent listening for demanding enthusiasts.
Description
The Stax SR-007 MK2 is an open-back audiophile headphone built around electrostatic panel technology, a design radically different from that of traditional dynamic headphones. The emissive surface of its diaphragms, larger than in conventional transducers, allows for a particular sound diffusion that Stax positions as the pinnacle of its range.
This model stands out for diaphragms presented as the thinnest and most conductive in the Stax range. Their uniformity aims for an even distribution of the signal, reducing distortion and therefore resonances liable to alter sound reproduction. Compared with the original SR-007, the MK2 brings increased dynamic capability while maintaining high linearity. The modulation cable has also been revised, with a significantly reduced inductance compared with the previous version.
When listening, these developments translate into a sought-after transparency across the entire audio spectrum and a bass reproduction without excessive trailing, according to the manufacturer's description.
These headphones are aimed at passionate, demanding audiophiles who already have a quality hi-fi system. Electrostatic technology indeed requires a dedicated amplifier, specifically designed to power this type of transducer; Stax recommends pairing the SR-007 MK2 with its own amplifiers to fully exploit its potential.
Technical specifications
| Type | Open-back push-pull electrostatic headphones |
| Impedance | 170 kΩ (at f = 10 kHz) |
| Sensitivity | 100 dB / 100 V r.m.s. at f = 1 kHz |
| Length | 2.5 m (cable) |
| Weight | 365 g (body only), 512 g (with cable) |
What to check before buying used
The electrostatic circuit and its matching transformer are the sensitive components of these headphones: a hiss, crackling, or channel loss when listening indicates a charge leak or a tired solder joint on one of the diaphragms. The foam on the self-adjusting headband and the padding on the ear cushions compress or tear with age, which affects comfort and acoustic sealing. The high-voltage cable dedicated to Stax amplifiers should be checked at both the connector and the sheath, as any play or oxidation on the pins can cause arcing or signal cuts.
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