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The essence of wide band range. 
The movement toward wider band ranges in the world of audio is evident. For example, in the appearance of SACD and DVD audio, it is much like the mega-pixel of CCD light-receiving elements in digital cameras. What will CCDs, which have already topped the 10 million mark, carry out? It isn’t simply a question of images not deteriorating as a result of enlargement. The real benefits come from the ability to show every single human eyelash with absolute clarity and from the richness of gradation of shading. Electrostatic earspeaker systems are being reassessed as next-generation audio systems that make it possible to achieve an astonishingly wide range and now, their real value is being recognized. Vacuum tube output stage transformer made possible by use of the electrostatic method, ideal pure balance operation with no need for an inverted circuit, a DC amplified configuration… The new SRM-006tII has evolved into a new territory with wider band range and detailed refinements.
 
The SRM driver unit shows the true value of electrostatic earspeakers.
 
Pure balance, DC amplifier configuration.
 
The key concept is the output stage employing a high sound quality vacuum tube 6FQ7 (6CG7), and further refinements have been introduced into all the individual parts
A wider range than ever before. There’s no end to technical evolution.

Wide range: In order to make maximum use of the wide-range properties of SACD and DVD audio, the circuit have been constantly been revised, resulting in a wider than ever replay frequency range.
 
Heater power supply: Adopting a rectifier circuits combining low-noise, low-loss Schottky barrier diodes and large electrolytic capacitors. Low-ripple DC power source improves the SN ratio.
Output stage: A simple two-stage amplifier configuration using a high-resistance dual three-pole tube 6FQ7 (6CG7) results in straightforward properties that are transparent and clear sound quality.
Input: It’s possible to switch between three systems (two RCA input systems and one XLR input system). Pure balance circuit: The electrostatic transducer is driven by electrodes set on both sides of the diaphragm which carry the push-pull signals. This is thus virtually the only replay system that enables the listener to enjoy replay unique to balance transmission without the need to pass through a transformer or an inversion amplifier. The input stage makes use of a hand selected low-noise FET. Unit also employs a total of six acoustic high sound quality relays (three on both sides). Simultaneous switching of the hot side and the cold side of the two-system RCA input means that the input source is isolated of direct current. Almost no interference between different devices.
Equipped with parallel output terminals: Input 1 can be directly connected to for example an SACD player for pure quality listening with a shorter signal path, while the output connected to a pre-amplifier or power amplifier with volume control simultaneously.
 
Use of high sound quality 4-stage volume control: Connection is possible with line level devices such as CD players including XLR.
Front panel: Brushed Aluminum silver finish and designed with rounded panel corners.
Specifications: SRM-006tII Driver unit
●Frequency response: DC 80 kHz / +0, -3 dB (in the case of use of one SR-404 unit) 
●Rated input level: 200 mV with 100V output
●Maximum input level 30 V r.m.s. with volume at minimum setting 
●Amplification: 54 dB (x500)
●Total harmonic distortion max. 0.02% at 1 kHz 100 V r.m.s. (in the case of use of one SR-404 unit)
●Input impedance 50 kΩ / during balance 50 kΩ × 2 
●Maximum output voltage: 300 V r.m.s. / 1 kHz 
●Standard bias voltage DC580 V (PRO bias)
●Power voltage AC120V-240V ± 10%, 50 to 60 Hz. (Adjusted for your area)
●Power consumption 49 W
●Temperature range for use Between 0º and 35ºC, max. 90% (no condensation)
●External dimensions 195 (W) × 103 (H) × 375 (D) mm (including volume knob and pin jack (20 + 10))
●Weight 3.4 Kg
●XLR terminal polarity No. 1: Sealed; No. 2: Hot; No. 3: Cold (European system)
Specifications and external appearance may be changed without notice in order to improve performance.
When you hope for XLR polarity (the third HOT) of American system, please order it from an approved distributor for your area or an official dealer.
Specifications: SR-404 (Signature) Headphone
●Type Electrostatic/Open back/Push-pull driving
●Frequency Range 7-41,000Hz
●Capacitance, including cable 110pF
●Sound Pressure Level 100dB/100V r.m.s.
●Cable Wide format Low Capacitance PC-OCC Conductor
●Earpad High quality artificial Leather
●Weight including cable 472g
without cable 300g
●Color Brown
●Operation Temperature 0-35 Degree

Part of a history of ultra-precision sound checking

It’s not surprising that there are many music fans and audiophiles who have never heard of the audio maker STAX nor are they even aware of its existence. But even such people will have heard “the work of STAX”. This is because STAX products are used widely throughout the World by a large number of recording companies for sound-checking purposes in almost every stage of their production process. They are used to check that the sound has been recorded just as intended, for example by making sure that a Stradivarius really sounds like a Stradivarius, or to make sure that no unintended noise has found its way onto the mother disc or the stamper. This is because there are sounds that can only be detected by the human ear and that cannot be differentiated by a measuring device in terms of whether they are musical sound or just plain noise. STAX devices make use of high-polymer film which is several tens of times thinner than food wrapping. This is the diaphragm present in STAX electrostatic earspeakers. STAX is a Japanese brand that was the first in the world to pioneer electrostatic headphones of the condenser type, and STAX remains to this day, virtually the only company in the world active in this particular area. This is an earspeaker series whose high-range reproduction capacity has been proved especially by the appearance of SACD, DVD audio and other new-generation media. The combination that might be described as the global standard is the series leading up to the new product SRS-3050II. The new SRM-323II driver unit is compatible with media employing an increasingly wide band range. Because of the way in which the power section has been strengthened, it has outstanding playback capacity, recreating low-pitched sounds with real presence that really underpin the music rather than constituting a mere amorphous mass, while the flawless sounds that float above could even, if one so wished, be analyzed in terms of their very structure. Then there’s SR-303, a product in the earspeaker lineup that focuses especially on high sound quality. And we are now releasing SRS-3050II, a product that presents the ideal combination.
 
SRS-3050II: The global standard
The electrostatic type is structured to ensure balanced operation. This means that a balance circuit is present until the moment of conversion into air vibrations. This is the only system that makes it possible to enjoy the sound innate to the balance system. SRS-3050II is a system based on combination with the new SRM-323II driver unit, which has a significantly strengthened power transformer, and it has permitted a major expansion in dynamic range. The simple two-stage amplifying circuit configuration with FET characterized by high sound quality and low noise at the input stage offers sound quality fully worthy of being referred to as the global standard.
 
SR-303: The product of limitless experience
This is the latest model in the SR-Lambda series, which houses an elliptical unit that fits the shape of the human ear and makes use of the same new high-polymer film diaphragm as the SR-404 Signature. Follow-up features in respect to input signals have been improved by brushing up the diaphragm and the cables. This is a model occupying a position at the center of the line-up that succeeds to the smooth and high-resolution tradition of STAX earspeakers. The rectangular unit that might be described as the precursor of universal design sends out sounds to the outer ear as a whole by means of parallel plane waves, and it has been designed in such a way as to emulate as far as possible the process whereby the ear perceives natural sounds and sounds in a concert hall. What’s more, the ear pads do not weigh down on the outer ear: an appropriate amount of space is ensured in the periphery so as to create a pleasant listening environment with no sense of pressure or unnaturalness.
 
Specifications: SR-303 (Classic) Headphone
●Type Push-pull electrostatic earspeaker
●Frequency Range 7-41,000Hz
●Capacitance, including cable 120pF
●Sound Pressure Level 100dB/100V r.m.s.
●Cable / color 2.5 m, PC-OCC, low-capacitance cable / gray
●Earpad Highly permeable high-quality synthetic leather
●Weight including cable 450g
without cable 300g
●Channel Identification: Displayed on the headband arc section; Left: Solid line on cable; Right: Dotted line on cable.
●Operating temperature and humidity Between 0º and 35ºC, max. 90% (no condensation)
Specifications are subject to change without notice.
 
Specifications: SRM-323II Driver unit
●Frequency response: DC- 60 kHz (SR-303, when using one unit)
●Rated input level: 200 mV with 100V output
●Maximum input level 30 V r.m.s. with volume at minimum setting 
●Amplification: 54 dB (x500)
●Total harmonic distortion max. 0.01% (1 kHz / during 100 V r.m.s. output) 
●Input impedance 50 kΩ (RCA) 
●Maximum output voltage: 400 V r.m.s. / 1 kHz 
●Standard bias voltage DC580 V (PRO bias)
●Power voltage AC120V-240V ± 10%, 50 to 60 Hz. (Adjusted for your area)
●Power consumption 29 W
●Temperature range for use Between 0º and 35ºC, max. 90% (no condensation)
●External dimensions 150 (W) × 100 (H) × 360 (D) mm (including knobs and terminals)
●Weight 2.9 Kg

Wider than ever range sure to satisfy all the demands of next-generation media. In the entry class but featuring high-end quality! Birth of a driver unit for the next generation.
An electrostatic type of transducer in which a transparent polymer film less than 2 microns thick is driven by the power of static electricity. Astounding quality obtained by an incredibly light diaphragm almost as light as air. As the world's only manufacturer of electrostatic ear speakers, STAX has pursued the ideal of quality for many years. Electrostatic speakers require dedicated driver units different from speakers of the dynamic type, and STAX has built up a store of unique electronic technology that has resulted in many achievements such as the release of Japan's first ever DC amplifiers. Increasingly wide ranges capable of responding to new-generation media such as SACD and DVD-Audio are being called for in many different fields. SRM-252II is a new product that responds to this demand while at the same time raising the quality of each of the individual parts. Also, the reproduction frequency band has been increased to 35,000Hz. The body is made from a plentiful quantity of extruded aluminum, which equips it with strength and resilience. Parallel out terminals have been newly incorporated for greater ease of use. It's now possible to connect the input directly to a power amplifier or other device. The electrostatic transducer is in principle balance-driven, but all models of ear-speaker make it possible to enjoy original sound quality based on the balance method which is generally adopted for use with top-end audio equipment.
Specifications: SR-202 (Basic) Headphone
●Type Push-pull electrostatic earspeaker
●Frequency Range 7-41,000Hz
●Capacitance, including cable 120pF
●Sound Pressure Level 100dB/100V r.m.s.
●Cable / color 2.5 m, LC-OFC, low-capacitance cable / black
●Earpad High quality synthetic leather
●Weight including cable 450g
without cable 300g
●Left/Right Indication L&R indicators are provided on the HEAD SPRING ARC and the left channel cable is marked with a solid line while the right channel cable is marked with a dotted line.
●Operating temperature and humidity Between 0º and 35ºC, max. 90% (no condensation)
 *Specifications and appearance are subject to change without notice for improvement.
Specifications: SRM-252II Driver unit
●Frequency response: DC- 35 kHz (40Vr.m.s. output SR-202, when using one unit) 
●Rated input level: 200 mV with 100V output
●Maximum input level 30 V r.m.s. with volume at minimum setting 
●Amplification: 54 dB (x500)
●Total harmonic distortion max. 0.01% (1 kHz / during 100 V r.m.s. output) 
●Input impedance 50 kΩ (RCA) 
●Maximum output voltage: 280 V r.m.s. / 1 kHz 
●Standard bias voltage DC580 V (PRO bias)
●Power consumption DC12V, 4W/ Exclusive AC adaptor attached For your area
●Temperature range for use Between 0º and 35ºC, max. 90% (no condensation)
●External dimensions 132 (W) × 38 (H) × 132 (D) mm (without Knob, Pin jack)
●Weight 540g

Stax SRS - 3010

The Stax SR-003 is the home audio version of the S-001MK2 In-The-Earspeakers with a 5-pin plug connection suitable for any Stax driver unit or adaptor with "Pro" capability.
Extremely comfortable lightweight soft tipped pads for inner ear comfort and extended bass response.
Even lighter diaphragm reduced from 2.5 micron thickness to a remarkable 1.5micron resulting in further resolution, transparency and purer listening pleasure.
As the SR-003 is In-The-Ear type Earspeakers, comfort is enhanced leaving the ears clear of all external restrictions and perspiration that may result from heavy earpad types.
Stax are confident that the SR-003 In-The-Earspeakers will provide every listener with satisfaction and Stax unsurpassed sonic superiority. 
Specifications : SR-003
●Type Electrostatic canal type In-The-Earspeakers, push-pull driving
●Frequency Response 20-1kHz ±2dB, 1kHz-20kHz ±4dB
●Capacitance 44pF with cable, 17pF without cable
●Impedance 360K ohms/10kHz
●Sensitivity 111dB/100Vr.m.s. /1kHz
●Maximum Sound Pressure level 119dB/1kHz
●Standard Bias Voltage 580V
●Pad(Fitting Rubber) Made of silicon rubber (2 sizes, M and L)
●Cable 6-core parallel/1.5m
●Weight and Size 28g with cable
12g without cable, 28mm diameter
Specifications and external appearance may be changed without notice in order to improve performance.
Specifications: SRM-252II Driver unit
●Frequency response: DC- 35 kHz (40Vr.m.s. output SR-202, when using one unit) 
●Rated input level: 200 mV with 100V output
●Maximum input level 30 V r.m.s. with volume at minimum setting 
●Amplification: 54 dB (x500)
●Total harmonic distortion max. 0.01% (1 kHz / during 100 V r.m.s. output) 
●Input impedance 50 kΩ (RCA) 
●Maximum output voltage: 280 V r.m.s. / 1 kHz 
●Standard bias voltage DC580 V (PRO bias)
●Power consumption DC12V, 4W/ Exclusive AC adaptor attached For your area
●Temperature range for use Between 0º and 35ºC, max. 90% (no condensation)
●External dimensions 132 (W) × 38 (H) × 132 (D) mm (without Knob, Pin jack)
●Weight 540g

From the company that pioneered electrostatic headphones as early as 1960.
Stax now introduce the Mark 2 version of the SR-001 system featuring:
 
Extremely comfortable lightweight soft tipped pads for inner ear comfort and extended bass response.
Even lighter diaphragm reduced from 2.5 micron thickness to a remarkable 1.5 micron resulting in further resolution, transparency and purer listening pleasure.
 
The Stax SR-001MK2 is lightweight and presents the listener on the move with the renowned Stax sound.
The SRM-001 driver unit completes with two AA batteries intact weighs only 140 grams and unobtrusively into any convenient pocket.
The Stax SR-001MK2 system connects directly to any portable CD, DAT or Mini Disc player even the traditional Walkman or portable radio. The dedicated SRM-001 driver unit gives up to five hours listening depending on battery conditions and use. A standard AC adaptor 4.5V 300 MA will allow the SRM-001MK2 to connect to the mains. Please contact your Stax Dealer.
Stax are confident that the SR-001MK2 In-The-Earspeaker System will provide every listener with satisfaction and Stax unsurpassed sonic superiority.
 
FEATURES

S-001MK2 (Earspeakers Part)
1. Type Electrostatic canal type In-The-Earspeakers, push-pull driving 
2. Frequency Response 20-1kHz ±2dB, 1kHz-20kHz ±4dB
3. Capacitance 44pF with cable, 17pF without cable
4. Impedance 360K ohms/10kHz
5. Sensitivity 111dB/100Vr.m.s. /1kHz
6. Maximum Sound Pressure level 119dB/1kHz
7. Standard Bias Voltage 580VDC
8. Pad(Fitting Rubber) Made of silicon rubber (2 sizes, M and L)
9. Cable 6-core parallel/1.5m
10.Weight and Size 28g with cable
12g without cable, 28mm diameter 
Specifications are subject to change without notice.

SRM-001 (Driver Unit Part)
1. Frequency Response 5-20kHz +4dB,
-3dB(10V r.m.s. output driving 1 : S-001MK2 
2. Gain 54dB
3. Harmonic Distortion 0.1% (1kHz/100V r.m.s.
output driving 1 : S-001 MK2) 
4. Input Impedance 10k ohms
5. Standard Input Level 100mV for 50V output
6. Maximum Output Voltage 240V r.m.s./1kHz
7. Power Consumption 1.3W/4.5V (AC/DC Adaptor Operation),
0.8W/3V (battery operation) 
7. Size 60mm(W)×24mmm(H)×120mm(D)
9. Weight 102g without battery
140g with standard dry cell batteries