SRM-400S vs SRM-500T
The SRM-500T matches the SRM-400S on thd (0.010%), input impedance (50000Ω), weight (3.4 kg (7 lbs)), and width (195 mm).
AI-generated product photo — not official manufacturer imagery.
AmplifiersHeadphone Amplifiers
Estimated price (community-sourced)
$850 - $1,299
Around — community and catalog average, updates slowly
About the SRM-400S
The STAX SRM-400S is a semiconductor driver unit for STAX electrostatic earspeakers and the successor to the SRM-353X. It uses an all-stage FET DC amplification design with custom low-noise dual FETs in the first stage and is positioned as a middle-class model intended for users moving up from entry-level systems or pairing with advanced Lambda series headphones. It emphasizes high-resolution sound, dynamic low-range reproduction, and balanced tonal performance.
Specifications
Analog Output
Analog signal output specifications
- THD
- 0.010%
- Max Output Voltage
- 400.0V RMS
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Analog Inputs
- RCA, XLR
- Analog Outputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 195 × 102 × 376 mm (W × H × D)
- Weight
- 3.4 kg (7 lbs)
- Available Colors
- black chassis with silver faceplate
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions