STAX SRM-700T Electrostatic Headphone Amplifier, Wired, Silver

Tube warmth. Electrostatic speed. Effortless space.

Experience your STAX earspeakers with the hybrid amplifier designed to reveal everything—micro-detail, lightning-fast transients, and the liquid midrange only great tubes deliver. The SRM-700T blends a low-noise dual FET input stage with a 6SN7 valve output stage to pair electrostatic precision with inviting musicality, all from a beautifully finished silver front panel that feels every bit as premium as it sounds.

Why Audiophiles Choose This Product

• Seductive, spacious sound: Ultra-wideband response from DC to 100 kHz preserves air, depth and delineation; the 6SN7 output adds body and bloom without sacrificing speed. Reviewers highlight expansive staging and “you-are-there realism.”
• Hybrid engineering that matters: Custom low-noise dual FETs at the input feed a high-slew-rate 6SN7 tube output (two valves), inspired by STAX’s flagship topology—voiced for transparency with natural tone.
• Thoughtful, real‑world usability: Dual 5‑pin PRO (580 V) electrostatic outputs on the front, split (concentric) volume for easy channel balance, and a rear “LEVEL CONTROL” bypass for preamp integration. Warm-up indicator LED blinks during tube heat‑up for about 40 seconds, then locks solid—simple and reassuring.
• System-friendly connectivity: Balanced XLR and single‑ended RCA inputs with a rear selector, plus an RCA parallel out for daisy‑chaining to your main system. No built‑in DAC—bring your favorite source.
• STAX heritage, modern refinement: Hand‑selected FETs, non‑inductive resistors, high‑definition film capacitors, EMI‑shielded volume, and vibration‑controlling aluminum feet show the details behind the sound. STAX has led electrostatic innovation since the SR‑1 in 1960.

What’s Included

• Main Product: STAX SRM‑700T hybrid electrostatic headphone amplifier (6SN7 x2 pre‑installed) in Silver.
• Primary Accessory: AC power cable.
• Secondary Items: Stereo RCA interconnects (starter grade) for quick setup. No adapters are included; use STAX‑standard 5‑pin PRO‑bias earspeakers.
• Documentation: User manual and warranty card. The manual covers “LEVEL CONTROL” Internal/External (Bypass) operation and warm‑up indicator behavior.

Technical Specifications

Practical note: the SRM‑700T runs warm by design; allow ventilation above and around the chassis.

Professional Recognition

• Awards: AudioKey Reviews honored the SRM‑700T with its Golden Keynote Award for “beguiling musicality… exceptional detail and resolution, and incredible spaciousness.”
• Reviews: Audiophile Style praised the 700T/SR‑009S combo for delivering “the widest, deepest soundstage that I have ever heard from headphones.”
• Heritage: STAX has been synonymous with electrostatic “Earspeakers” since introducing the SR‑1 in 1960—pioneering reference‑grade listening for over six decades.
• Innovation: Hybrid topology derived from the SRM‑T8000 flagship, EMI‑shielded volume control, and high‑grip vibration‑damping insulators reflect STAX’s continuous refinement.

The Bottom Line

If you love the immediacy and inner detail of electrostatics but crave a touch of tube warmth and dimensionality, the SRM‑700T delivers a rare balance: speed without sterility, tone without haze. With balanced and single‑ended inputs, dual PRO outputs, and easy preamp integration via level bypass and parallel out, it anchors a modern STAX system with confidence—backed by precise engineering and a legacy that defined the category. Pair it with your favorite DAC and PRO‑bias earspeakers, give it a minute to warm, and settle in for hours of effortless, fatigue‑free listening.

Notes for buyers:

• The SRM‑700T is designed exclusively for electrostatic headphones (STAX‑standard 5‑pin, 580 V PRO bias). It does not drive dynamic or planar magnetic headphones.
• For maximum headroom with the most demanding earspeakers, STAX’s solid‑state sibling SRM‑700S offers a higher 450 Vrms ceiling; choose your voicing (tube vs. solid‑state) to taste and system needs.

Research Sources: Official specifications and design details from STAX; user manual for operating behavior; professional reviews for listening impressions and awards; and community consensus on connection standards.