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STAX SRS-005S MK2 (SR-003 MK2 + SRM-252S combo package) Electrostatic Earphone and Electrostatic Energizer

SRS-005S MKII combo consists of SRM-252S Amplifier and SRM-003 MK2 Earphone

+ SR-003 MK2 is a 5-pin PRO bias type in-the-ear Ear speaker
+ SRM-252S is an exclusive driver unit (amplifier) for driving STAX ear speakers with PRO-bias 5 pins

The SR-003MK2 is a 5-pin PRO bias type in-the-ear ear speaker and can be used by connecting to a driver unit having 5-pin PRO bias output socket.
The redesigned ear canal type structure of the SR-003 enables you to enjoy excellent electrostatic sound quality without covering your ears.
The SR-003MK2 connects to STAX driver units or adapters equipped with 5-pin type PRO bias output.
LIGHTER DIAPHRAGM 15% lighter than the S-001/MK2 results in further resolution, transparency and purer listening pleasure.
The SRM-252S is an exclusive driver unit (amplifier) for driving STAX ear speakers with PRO-bias 5 pins.
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.

SR-003 MKII SPECIFICATIONS:

Type: push-pull electrostatic, canal-type in ears
Frequency response: 20 - 20 kHz (±4dB)
Static capacity: 44pF (including attached code)
Sound pressure sensitivity: 110dB/100V r.m.s. / 1kHz
Bias voltage: 550V – 580V
Ear tips: L/M/S size made of silicone rubber (M size equipped at factory shipment)
Cord: 5-pin for STAX PRO bias, 6-core parallel, total length 1.5m
Weight: 38g (including code), 12g (main part only)
Dimension: 28mm (diameter)
Overhead arc weight: 15g

SRM-252S (Energizer) SPECIFICATIONS:

Frequency response: DC - 35kHz
Rated input level: 125mV (at 100V output)
Gain: 58dB
Harmonic distortion: 0.01% or less (at 100Vr.m.s. / 1kHz output) Input impedance: 50kΩ(RCA)
Input terminal: RCA x 1
Maximum output voltage: 280Vr.m.s. / 1kHz
Standard bias voltage: DC580V
Power consumption: 4W
Operating temperature / humidity: 0 to 35 degrees C / less than 90% (non-condensing)
Dimension: 132mm(W) x 38mm(H) x 132mm(D) (protruding portion not included)
Weight: 540g