SRM-1mk2 vs SRM-353X
The SRM-353X's thd is 0.010% against the SRM-1mk2's 0.020%. Both share input sensitivity (0.1V RMS), input impedance (50Ω), and class (A).
Both turn up in the same documented systems.
AI-generated product photo — not official manufacturer imagery.
AmplifiersHeadphone AmplifiersDiscontinued
About the SRM-1mk2
The Stax SRM-1 MK2 is a professional-grade electrostatic headphone driver unit released in 1982 as the Mark II version of the original SRM-1. It represents a significant upgrade from its predecessor by adding support for Professional (Pro) bias earspeakers in addition to Standard bias models, making it compatible with virtually all Stax earspeakers from 1959 onwards. The amplifier employs pure class-A AC-coupled amplification with complementary output devices in a non-magnetic case design to prevent magnetic coupling interference. This vintage Japanese-made energizer is highly regarded in the audiophile community for its clean signal path and ability to drive Stax electrostatic headphones with precision. The unit requires standard RCA line-level inputs and features rear-panel voltage selection for international use. Due to its age and the advancement of newer Stax amplifier models, the SRM-1 MK2 is no longer in production, though it remains sought after by vintage audio enthusiasts and Stax earspeaker users.
Specifications
Analog Output
Analog signal output specifications
- THD
- 0.020%
- Output Voltage
- 0.3V RMS
- Max Output Voltage
- 300.0V RMS
Connectivity
Input and output connections
- Bluetooth
- No
- Wi-Fi
- No
- Ethernet
- No
- Digital Inputs
- RCA
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 195 × 103 × 375 mm (W × H × D)
- Weight
- 3.9 kg (9 lbs)
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions