Headphones amplifiers — Stax SRM-700S

The SRM-700S is a genuinely accomplished fully semiconductor high-end driver amplifier from Stax, the world-renowned manufacturer of electrostatic equipment, incorporating a number of firsts for the brand alongside its traditional solutions. The SRM-700S brings Stax's most storied electrostatic-driver expertise to a serious, all-transistor amplification format.

Key specs that matter

Frequency response extends up to an exceptional 100,000Hz, with gain at 60dBu. THD is a genuinely low 0.01% at 1V RMS into 300 ohms. At 240 x 103 x 393mm and 6.3kg, the SRM-700S maintains a genuinely substantial electrostatic-amplifier chassis reflecting Stax's most accomplished current all-semiconductor engineering.

Sound and use context

Expect exceptionally clean, low-distortion amplification reflecting the exceptional 100kHz bandwidth combined with the low 0.01% THD figure, with the fully semiconductor design incorporating solutions never previously used in Stax's proprietary equipment.

Pairing

The SRM-700S 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-700T offers a hybrid tube-and-transistor alternative sharing similar chassis dimensions within the same broader T-line 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.