Stax SRS-3100 Plus Electrostatic Earspeaker System (+ iFi iPower X)

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The SRS-3100 Plus Electrostatic Earspeaker System by STAX Audio consists of the SR-L300 Earspeakers (headphones), the SRM-252S Energiser (headphone amplifier), plus the iFi Audio iPower X Ultra-Low Noise-Cancelling Power Supply.

The SR-L300 earspeaker employs new hand selected thin film diaphragm and tough stainless fixed electrodes. Rich deep bass response, delicate high frequency and soothing mid-range has been achieved in a balanced manner.

The SRM-252S is an exclusive driver unit (amplifier) for driving STAX ear speakers with PRO-bias 5 pins. Its line input can directly connect to the audio output terminal of CD player, portable audio player and PC. The SRM-252S has a simple design that excels in sound quality employing the carefully selected newest high-voltage transistors and low-noise FETs. The output stage featuring the emitter-follower configuration reinforces the driving performance and also realized the smooth sound quality. Moreover, the class-A amplification throughout the stages with no coupling capacitors reproduces exhaustively the finest nuance of music. Although the SRM-252S includes a class-A DC amplifier in a compact CD jacket size case, the internal heat is effectively dissipated through the chassis of aluminum extrusion material to improve the reliability over a long period of time. Also, the parallel output terminal was added to distribute the source signal so that a loud speaker may also be simultaneously used when source equipment has only a pair of output terminals.

The new iPowerX from iFi Audio uses the latest solid organic capacitors for better suppression of high-frequency noise. And the leakage capacitance is some 20x lower than your normal SMPS. In a nutshell, there is no escape for unwanted noise. iPower X will give you 20% more power than the original iFi iPower and increased amperage, too.


  • SR-L300 Earspeakers
    • Type : Push-Pull electrostatic oval sound element, Open-Air type enclosure
    • Frequency Response : 7 - 41,000Hz
    • Capacitance : 110pF (including cable)
    • Sensitivity : 101dB / 100V r.m.s. 1 kHz
    • Bias Voltage : 580V DC
    • Left & Right Channel Identification : 'L' and 'R' indicated on the arc assembly, solid line (left) and dotted line (right) on cable
    • Ear Pads : High-quality synthetic leather
    • Cable : OFC parallel 6-strand, low-capacity wide cable, 2.5m full length
    • Weight : 11.4oz without cable / 15.8oz with cable
  • SRM-252S Energiser / Driver
    • Type : All-stage semiconductors, Low-noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
    • Frequency Response : DC to 35,000Hz with SR-207 (with SR-207)
    • igh Harmonic Distortion : Max 0.01% (1kHz at 100V r.m.s. )
    • Gain : 58dB (x800)
    • Input Terminal : 1 RCA with 1 RCA parallel out
    • Rated Input Level : 125mV / 100V Outputs
    • Max. Input Level : 30V (at minimum volume level)
    • Input Impedance : 50KΩ(RCA)
    • Max. Output Voltage : 280V r.m.s. (1kHz)
    • Standard Bias Voltage : PRO 580V x 1
    • Power Voltage Frequency : 117V (50Hz / 60Hz)
    • Power Consumption : 4W DC12V
    • Temperature & Humidity : 0 to 35ºC / 90% max. without condensation
    • Dimensions : 5.2 (W) x 1.5 (H) x 5.2 (D) in
    • Weight : 1.2lbs
    • Color : Silver

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Headphone Features

Transducer Type:
Ear Cup:
Open Back
Headphone Type:
  • Electrostatic Headphones
  • HiFi Headphones
Frequency Range:
7 - 41,000
Cable Length (m):


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