The Stax SRM-400S Electrostatic Headphone Amplifier powers electrostatic headphones with crisp, energetic sound, offering a clear and balanced audio experience. An accessible entry into Stax’s solid-state energizers, it delivers precision at a great value. Available at Len Wallis Audio, the Stax SRM-400S Electrostatic Headphone Amplifier is ready for audition in our Lane Cove showroom.

Why Choose the Stax SRM-400S Electrostatic Headphone Amplifier?

Introduced as part of Stax’s energizer lineup, the Stax SRM-400S Electrostatic Headphone Amplifier is a solid-state performer. It’s designed to drive electrostatic headphones with exceptional clarity and energy.

Featuring an all-stage FET design, it uses custom dual FETs for low-noise amplification. RH Audio Reviews in 2022 praised its “clean and dynamic” delivery, highlighting its ability to reveal subtle details in music.

The SRM-400S achieves noise levels below 0.01% distortion at 1 kHz. This ensures a silent background, allowing every note to shine through with precision and clarity.

With a frequency response from DC to 90 kHz, it captures the full audio spectrum effortlessly. Its 400 Vrms maximum output provides ample power for a dynamic listening experience.

Confused by input options on amplifiers? The SRM-400S simplifies things with switchable RCA and XLR inputs, plus an RCA parallel output, for easy system integration.

A dual-winding transformer improves efficiency by 10% over previous models, enhancing sound quality. This upgrade keeps power consumption low at 30W, making it an eco-friendly choice.

Audition the Stax SRM-400S Electrostatic Headphone Amplifier at our Lane Cove showroom. Discover why it’s a fantastic choice for audiophiles seeking crisp electrostatic energy.

Technical Specifications

• Amplifier Type: All-stage FET configuration DC amplification driver
• Input Stage: Custom-made low-noise dual FET
• Output Stage: Class-A solid-state with balanced configuration
• Frequency Response: DC – 90 kHz
• Gain: 60 dB
• Harmonic Distortion: 0.01% or less at 1 kHz/100 Vrms output
• Input Impedance: 50 kΩ (RCA), 100 kΩ (XLR balanced)
• Maximum Output Voltage: 400 Vrms at 1 kHz
• Bias Voltage: PRO 580 V
• Signal-to-Noise Ratio: >105 dB (A-weighted, at maximum output)
• Inputs: RCA x 1, XLR x 1 (mutual exclusion)
• Outputs: RCA parallel output terminal
• Electrostatic Outputs: Two 5-pin PRO bias connectors
• Power Supply: Dual-winding transformer, AC 230V, 50 Hz
• Power Consumption: 30 W
• Operating Conditions: 0°C to 35°C, <90% humidity (non-condensing)
• Chassis Material: Non-magnetic aluminium for vibration reduction
• Volume Control: Double-axis 4-gang Alps potentiometer
• Dimensions (W x H x D): 195 x 102 x 376 mm (including protrusions)
• Weight: 3.4 kg

Read the review here.

Elevate your audio with the Stax SRM-400S Electrostatic Headphone Amplifier at Len Wallis Audio. Browse our curated collection of Stax products here or visit our Lane Cove showroom to audition this exceptional unit. Contact us today to secure the Stax SRM-400S Electrostatic Headphone Amplifier and experience electrostatic sound at its finest.

Len Wallis Audio Excellence Promise

Since 1978, Len Wallis Audio has been a trusted name in hi-fi, curating premium audio solutions from our Lane Cove showroom in Sydney. For over four decades, we’ve selected products that deliver outstanding performance and quality.

Our focus on innovation ensures every item meets audiophile standards. Whether upgrading or building a new system, our team helps you find the ideal audio solution for your needs.

With expert guidance and a commitment to satisfaction, we make your audio journey seamless and rewarding.

Ready to enhance your setup with the Stax SRM-400S Electrostatic Headphone Amplifier?

Call (02) 9427 6755
Email Sales@lenwallisaudio.com.au
Or visit us at 64 Burns Bay Road, Lane Cove, NSW, 2066