Stax SRS 5100 System


Brand Stax

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SRS-5100 (SR-L500 + SRM-353X)

The first SR-Lambda series was introduced 36 years ago and it has further developed into a new-generation SR-Lambda with its newly designed enclosure - the new SR-L500 advanced Lambda series Earspeaker.

Hand selected thin-film diaphragm as well as tough stainless fixed electrodes has been employed for the SR-L500. Thus, rich deep bass response, delicate high frequency and soothing mid-range has been achieved in a balanced manner.

The headband (ARC) assembly of the SR-L500 is equipped with 10-click slider mechanism for head pad height adjustment adopted from SR-009 and SR-507. Once adjusted, the slider always maintains its optimal position to make readjustment unnecessary. This enables you to enjoy hours of pleasant music listening with utmost comfort.

High performance pure copper HiFC™ developed by Hitachi employs the core wires. HiFC has various advantages, including similar sonic characteristics as used in SR-009 and SR-L500 6N high purity 99.99999% copper wires. The entire cable are then arranged in a flat, wide format configuration to lower the capacitance between each wires and finished with the most suitable structure to drive the earspeaker. 

New earpad design is carefully hand crafted with high quality synthetic leather for utmost comfort for hours of music enjoyment as well as sound performance.


The SRM-353X is the exclusive driver unit (amplifier) produced to drive STAX electrostatic Earspeaker headphones.  

Carefully hand selected high quality parts of audio grade further improves tonal quality, and achieved wider frequency response from re-examination of circuitry.  Newly added XLR input terminal enables connection of balanced outputs of audio equipment taking full advantage of its superior performance. 


-Original low noise dual FET at first stage as well as all stage direct coupling Class A DC amplifier configuration with no coupling capacitor has realized natural tone quality with large amount of information.

-Further improved emitter follower at output stage has enabled wide range reproduction resulting in both the extended dynamic range at high frequency and improved over all tonal quality.

-In addition to RCA input terminal, XLR balanced input terminal has been added to provide connection to wide range of audio equipment.

-Custom made 2 axis 4 gang volume control

-Extravagant non-magnetic aluminum alloy chassis

-Components with little aging characteristics are hand selected for tonal quality and performance


Type :Push-Pull Open Back Oval Electrostatic Earspeaker Headphone
Frequency Response :7 - 41,000Hz
Electrostatic Capacitance :110pF (including cable)
Impedance :145k Ω (including cable, at 10kHz)
Sound Pressure Sensitivity :101dB / 100V r.m.s. 1 kHz
Maximum Sound Pressure :118dB / 400Hz
Bias Voltage :580V DC
Left & Right Identification
:"L" and "R" indicated on the arc assembly
Left channel cable is marked with a solid line.
Right channel is marked with a dotted line.
Ear Pads :High quality synthetic leather
Cable :HiFC parallel 6-strand, low-capacity special wide copper cable, 2.5m full length
Weight :0.75lb without cable / 1lb with cable



:All-stage semiconductors, Low-noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
Frequency Response   :DC to 90,000Hz (with 1 SR-L series Earspeaker)
High Harmonic Distortion   :Max 0.01% (1kHz at 100V r.m.s. with SR-L500)
Gain   :60dB (x1000)
Input Terminal  
:1 RCA with 1 RCA parallel out and XLR 
Rated Input Level   :100mV / 100V Outputs
Max. Input Level   :30V (at minimum volume level)
Input Impedance   :50KΩ(RCA) 50KΩx2(XLR)
Max. Output Voltage   :400V r.m.s. (1kHz)
Standard Bias Voltage   :PRO 580V x 2
Power Voltage Frequency   :117V (50Hz / 60Hz)
Power Consumption   :30W
Temperature & Humidity   :0 to 35ºC / 90% max. without condensation
Dimensions   :5.9 (W) x 3.9 (H) x 14.2 (D) in
Weight   :6.6lbs
Color   :Silver
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