Stax
STAX SRM-400S Electrostatic Headphone Amplifier
The STAX SRM-400S is a renewed middle-class semiconductor driver unit, succeeding the SRM-353X. It features a new DC amplifier with FETs installed in all stages, including a custom-made low-noise DUAL FET in the first stage. This amplifier utilizes a hybrid chassis of non-magnetic aluminum for enhanced rigidity and reduced environmental noise. It offers both RCA and XLR inputs, a dual concentric volume knob, and RCA parallel out functions. The SRM-400S delivers high-resolution sound unique to semiconductor circuits and dynamic low-range reproduction, making it ideal for upgrading from entry-level systems.
$1299.00
Owner Satisfaction
4.4
/ 5
Category Rank
654
/ 731
#654 in Headphone Amplifiers
Price vs Category Average
-7%
Below average
Weight
3.4
/ kg
Who it's for
- Unrivaled Sonic Clarity
- Perfect System Synergy
- Dedicated Electrostatic Power
Who should skip it
- Exclusive Headphone Compatibility
- Significant Investment
- Desktop-Only Use
Key Specs
Weight
3.4kg
Dimensions
195 (W) x 102 (H) x 376 (D) mm
Frequency Response
DC – 90kHz
Gain
60dB
Total Harmonic Distortion
0.01%
Input Impedance
50kΩ
Maximum Output Voltage
400Vrms
Bias Voltage
DC 580V
Features
- All-stage FET configuration DC amplification driver unit
- Custom-made low noise DUAL FET in the first stage
- Hybrid chassis structure with non-magnetic aluminum
- RCA and XLR inputs with mutual exclusion
- Custom concentric dual volume knob
- RCA parallel output function
- Complete DC amplifier configuration
- No coupling condensers in signal circuit
What customers say
Customers consistently praise the STAX SRM 400S amplifier for its exceptional sound quality and remarkable value within the electrostatic headphone system. Many reviewers highlight its ability to deliver a clear, detailed, and expansive soundstage, perfectly complementing Stax headphones. Users appreciate its solid build and reliable performance, considering it a significant upgrade that unlocks the full potential of their electrostatic setup without requiring a top tier investment. It is seen as a highly competent and essential component for serious Stax enthusiasts seeking an authentic listening experience.
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$1299