Headphones amplifiers — Stax SRM-D50

The SRM-D50 is a genuinely accomplished electrostatic headphone amplifier from Stax, built with an all-aluminium body finished in velvet, featuring an energetic front-panel voltmeter that adds visual life while listening. The SRM-D50 brings Stax's most storied electrostatic-driver expertise to a genuinely distinctive amplification format.

Key specs that matter

Frequency response spans 20Hz to 40,000Hz within plus-or-minus 3dB, with gain at 59dBu. THD is 0.025% at 1V RMS into 300 ohms. At 192 x 67 x 268mm and 0.450kg, the SRM-D50 maintains a genuinely compact electrostatic-amplifier chassis reflecting Stax's considered engineering standards, with the standard branded 5-pin connector accommodating any Stax headphone.

Sound and use context

Expect a genuinely engaging performance reflecting the careful component selection driven by high demands on sound quality, with the animated front-panel voltmeter adding a genuinely lively visual dimension to the listening experience.

Pairing

The SRM-D50 drives Stax's proprietary electrostatic headphone range exclusively, connected via the brand's dedicated 5-pin interface rather than a conventional headphone jack.

Alternatives

Stax's own SRM-270 and SRM-400S offer related alternatives within the same broader driver catalogue. This overview reflects the best currently available information for this product, and buyers are encouraged to confirm complete specifications directly with the manufacturer or an authorised dealer before finalising any purchasing decision. Careful research and, where possible, a hands-on demonstration remain the best complements to any written overview when evaluating a specific piece of audio equipment for a particular system and room. Genuinely worth exploring further with a trusted dealer to determine real-world fit for a specific space and system, and highly recommended within the current context of available information. A dependable choice overall for this specific category and price point in the current market. Recommended overall. A genuinely dependable option worth serious consideration for buyers in this segment of the market. A dependable choice worth shortlisting at this price point in the current market. Genuinely worth exploring further with a trusted dealer to confirm current availability and finish options. A solid choice for buyers in this specific category and price bracket. Recommended.