STAX SRM-700S

The STAX SRM-700S is STAX's premier all-stage FET electrostatic driver, a fully discrete J-FET amplification design with hand-selected matched components, EMI-shielded volume control, bypass volume switch for direct preamplifier use, and 450V RMS maximum output. Built for SR-009S and SR-X9000 owners who want solid-state precision at its highest.

Type and Technology

All-stage FET DC amplification electrostatic driver. STAX custom-made low-noise dual J-FET in the amplification stage. Large-current emitter follower output circuit for low noise and accurate reproduction. High-definition film capacitors throughout. EMI-shielded volume control. Bypass volume control switch for use with an external preamplifier. Hand-selected matched FET pairs. Large power transistor array with effective heat dissipation via large-sized heatsink. Newly developed large-sized aluminum insulator with vibration-proof material for isolation. RCA and XLR inputs (mutual exclusion). RCA parallel output. 450V RMS maximum output voltage. 60dB gain.

Sound Character

Highly resolving, fast, and tonally neutral, the J-FET all-stage configuration delivers exceptional low noise, outstanding bass definition and transient response, and a precise, accurate presentation that extracts the full capability of the SR-009S and SR-X9000. The volume bypass switch makes it an excellent choice for those integrating the SRM-700S into a high-end source system with a dedicated preamplifier.

Build and Finish

Larger than the 400S/500T at 240 x 103 x 393mm and 6.3kg, reflecting the more extensive power supply and heatsink arrangements. Clean, well-built chassis with STAX's characteristic functional aesthetic.

Best For

SR-009S and SR-X9000 owners who want STAX's best solid-state driver for reference-level electrostatic listening, and those who prefer the objective precision of an all-FET design over tube amplification.

Specifications