Headphones amplifiers — Stax SRM-270

The SRM-270 is a genuinely accessible electrostatic headphone amplifier from Stax, equipped with input stages built on selected FET transistors and output stages using an emitter-follower circuit topology. The SRM-270 brings Stax's most storied electrostatic-driver expertise to an entry point into the brand's amplifier range.

Key specs that matter

Frequency response extends up to 35,000Hz. THD is 0.01% at 1V RMS into 300 ohms. Nominal input level is 125mV with an output voltage of 100V, with gain at 58dB. At 132 x 38 x 153mm and 5.4kg, the SRM-270 maintains a genuinely compact electrostatic-amplifier chassis reflecting Stax's considered accessible-tier engineering standards.

Sound and use context

Expect a genuinely clean, accurate performance reflecting the FET-transistor input stage combined with the low 0.01% THD figure, representing an accessible entry point into Stax's celebrated electrostatic headphone ecosystem.

Pairing

The SRM-270 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-400S and SRM-500T offer more accomplished 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. A well-rounded overall proposition.