Overview

The STAX - SRM-700S Semiconductor Driver Unit Review marks a milestone in electrostatic headphone amplification. Boasting an all FET configuration with a custom-made low-noise dual FET input stage and a pioneering J-FET second stage, the SRM-700S elevates every nuance of your music. Whether you’re into delicate chamber ensembles or thunderous orchestral crescendos, this driver unit delivers unrivalled clarity across DC – 100 kHz. Discover the SRM-700S on our site or speak with our experts to see how it can transform your listening sessions.

Key Features

• All-stage FET configuration with custom-made low-noise dual FET and J-FET circuitry
• Frequency response: DC – 100 kHz (with SR-009S)
• Gain of 60 dB with <0.01% THD at 1 kHz / 100 Vrms output
• Maximum output voltage of 450 Vrms for effortless drive of demanding earspeakers
• Low-noise, large-current emitter follower circuit for precise detail retrieval
• Versatile connectivity: RCA & XLR inputs, parallel RCA output
• Compact footprint: 240 W × 103 H × 393 D mm; lightweight at 6.3 kg

Sound Performance

The SRM-700S stands out for its ultra-low distortion and immense power delivery. With an impressively low noise floor courtesy of the J-FET second stage, you’ll hear micro-details previously masked by lesser amplifiers. The extended bandwidth ensures that supertweeters like the SR-009S sing with crystalline highs, while the strong current drive renders bass-lines with taut authority and control. Audiophiles will appreciate the sheer transparency and neutrality, making this unit an ideal partner for revealing high-resolution recordings.

Design & Build Quality

Encased in a robust aluminium chassis, the SRM-700S combines minimalist aesthetics with functional design. The front panel’s clean layout places input selector and level control at your fingertips, while the rear features solid RCA and balanced XLR connectors. At just 6.3 kg, it integrates seamlessly into any hi-fi rack, ready to complement your existing setup.

Who Should Choose the SRM-700S?

If you own or plan to invest in high-end electrostatic earspeakers like the STAX SR-009S or SR-007A, the SRM-700S is a no-compromise driver unit. It’s designed for the discerning listener who demands precision, speed and fidelity. Home-studio engineers and critical listeners will relish its ability to expose recording nuances, while classical and jazz enthusiasts will enjoy its lifelike rendition of acoustic instruments.

Pros & Cons

• Pros:
  • Exquisite detail and transparency
  • Ultra-wide frequency response (DC–100 kHz)
  • Low distortion (0.01% or less)
  • High output voltage (450 Vrms) for demanding headphones
  • Solid build quality in a compact chassis
• Cons:
  • Premium price point reflects its flagship status
  • Exclusive to electrostatic headphones only

Elevate Your Listening Experience

The STAX SRM-700S Semiconductor Driver Unit is more than just an amplifier; it’s a gateway to deeper musical immersion. Ready to experience its clarity and power firsthand? Contact our team at 1300 308 711 or email sales@theaudiotailor.com.au. Our audiophile experts are on hand to help tailor the perfect setup for your listening room.