The first SR-Λ (lambda) series was introduced 30 years ago, and now the SR-307 (and SR-407) have adopted the same sounding body (sound element) as that of the top model SR-507.
The conventional sound element has employed simplest structure so that as wide film diaphragm area as possible can be effectively used in comparison with its external size. Taking advantage of the conventional feature, the new sound element has been packaged in a tough resin case. Thus the new sound element has realized cleaner sound and better reliability. Also a new thin-film material (super engineering plastics) almost free from stretch through temperature or humidity has been adopted, enabling both the rich, deep low frequency and the delicate high-frequency sound.Specifications
Type: Push-pull electrostatic oval sound element, open-air type enclosure
Frequency response: 7 - 41,000Hz
Electrostatic capacitance: 120pF (including cable)
Impedance: 132kΩ (including cable, at 10kHz)
Sound pressure sensitivity: 101dB / 100Vr.m.s.
Bias voltage: 580V DC
Right/left channel indication: 'L' and 'R' indicated on the arc assembly, solid line (left) and dotted line (right) on cable
Ear pad: High-quality artificial leather (replacement part: EP-234GR)
Cable: PC-OCC parallel 6-strand, low capacity cable, 2.5m full length
Operating temperature/ humidity: 0 to 35 degrees C/ less than 90% (non-condensing)
Weight: 490g (including cable), 340g (without cable)
Body color: Gray
The SR-507 is the first to employ the new sounding body (sound element) since the original Lambda series. The conventional sound element has employed simplest structure so that as wide film diaphragm area as possible can be effectively used in comparison with its external size. Taking advantage of the conventional feature, the new sound element has been packaged in a tough resin case. Thus the new sound element has realized cleaner sound and more accurate sound image.
Also new thin-film material almost free from stretch through temperature or humidity has been adopted, enabling both the rich, deep low-frequency and the delicate high-frequency sound.Specifications
Type: push-pull electrostatic, oval sound element, open-air back type enclosure (case)
Frequency response: 7 - 41,000 Hz
Electrostatic capacitance: 110pF (including attached code)
Impedance: 145kΩ (including attached cable, at 10kHz)
Sound pressure sensitivity: 100dB / input 100Vr.m.s. / 1kHz
Maximum sound pressure level: 118dB / 400Hz
Bias voltage: 580V DC (standard)
Right/left channel indication: 'L' and 'R' indicated on the arc assembly (inside head spring), solid line (left) and dotted line (right) on cable
Ear pad: genuine leather (skin-touching portion), high-class artificial leather (circumference portion:)
Code: parallel 6-strand, 2.5m full length, low-capacity special wide cable, 6N(99.9999%) OFC with silver plating
Weight : 533g (including attached code), 388g (without cable)
SR-007 MK2 is our flagship model that aims to achieve the peak among STAX electrostatic speakers. Possessing strong drive power in respect to the diaphragm due to the provision of an area in which there are no holes whatsoever on the outer ring of the electrodes (fixed poles). This was completed after an extended process of design and productions of prototypes. After attaching to a thick insulated resin case, they are placed in a strong aluminum machined enclosure to shut out unwanted vibrations. The cable is designed with the most appropriate structure for transmitting signals to the electrostatic transducer. STAX original cables employs high-purity PC-OCC conductors that achieve outstanding sound quality due to their extreme thickness and low capacity. The SR-007 MK2 features improvements to the connection between the unit and the cable, achieving further improvements in transmission capacity and reliability. The mechanism is unique to the SR-007 series whereby the enclosure and the ear pads rotate independently making it possible to achieve a good fit to each individual listener. Specifications
Type: Push-pull electrostatic open-air type headphone
Frequency response : 6 to 41,000 Hz
Impedance : 170 KΩ (at f = 10 KHz)
Capacitance : 94pF (including cable)
Sensitivity : 100 dB / 100 V r.m.s. at f = 1 KHz
Bias voltage : 580 V / DC
Left & Right Channel identifications :
Left (L) and Right ® indicators are provided at the cable en trance points on the Earspeakers.
The left channel cable is marked with a solid Line.
The right channel is marked with a dotted Line.
Ear pads : Real leather (Lamb) used on a part coming into contact with the skin.
High-quality leather used for the surrounding part.
Cable : 2.5m, PC-OCC, wide, low capacitance cable
Weight : 365 g (Body) , 512g (Including cable)
Operating temperature range: 0 to 35
Humidity range for use: Less than 90% (without condensation)
The SR-009 is the product of the repeated research of technology and material without deviating from our stance to return to live sound and music with refined sensitivity.
It will be as a result of "work" each predecessor gathered up with "pride". Clearly, the way of life we live now is to inherit it and to bear "enhancement" and "evolution." This is proven by the fact that state-of-the-art technologies in the world exist intensively in present-day Japan. Making new things by skillfully taking advantage of these technologies has given birth to a "millennium" earspeaker (electrostatic headphone).
The newly developed sound element adopted in the SR-009 features a new high polymer ultra-thin film material called super engineering plastics for the diaphragm. Materials superior especially in tone quality have been selected to attain the extremely excellent frequency characteristic from low to super-high as well as the vast dynamic range.
New electrodes named MLER (Multi Layer ElectRodes) have also been developed to realize the plane drive of the whole film diaphragm surface. While thinness and flatness are required for the fixed electrodes, they simultaneously need to have other characteristics such as low resonance, high sound wave transmission and so on. These new electrodes have been completed through the unification of metal plates processed with ultra-precision photograph etching that utilizes high-tech heat diffusion combination on the atomic level.
Aluminum is a metal good for sound and suitable material for audio equipment. It is abundantly used, e.g. at the frame supporting the appearance and sound element, to achieve high-quality sound, rigidity and lightweight. Almost every part of the SR-009 is manufactured through precise machine processing.
High-purity copper developed from the necessity of wiring large-scale integration circuits is also known as high-quality audio cables. High-purity copper wire of 99.9999% (6Nines) purity adopted for the cable is further silver-coated and finished with the most suitable structure to drive the earspeaker.
Earpad of a new design enables hours of comfortable listening and is carefully made by a craftsman's hand and features both the real leather with good humidity environment and the cushion material with moderate elasticity.
The arc is equipped with a position adjustment mechanism of 10-step slider and corresponds to the wide range of cranial form with individual difference.Specifications
Type: push-pull electrostatic circular sound element, open-air type enclosure
Frequency response: 5 - 42,000Hz
Electrostatic capacitance: 110pF (including cable)
Impedance: 145kΩ (including cable, at 10kHz)
Sound pressure sensitivity: 101dB / input 100Vr.m.s. / 1kHz
Maximum sound pressure level: 118dB / 400Hz
Bias voltage: 580V DC
Right/left channel indication: 'L' and 'R' indicated on the arc assembly (inside head spring), solid line (left) and dotted line (right) on the cable
Earpad: real leather (skin touching portion), high-quality artificial leather (surrounding portion)
Cable: silver-coated 6N (99.9999%) OFC parallel 6-strand, low-capacity special wide cable, 2.5m full length
Weight: 596g (including cable), 454g (without cable)
SRM-007T2This post has been edited by Clem1982: Jan 23 2015, 03:11 PM