New products


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.

SR-407 SR-307
Type push-pull electrostatic oval sound element, open-air type enclosure
Frequency response 7 - 41,000Hz
Electrostatic capacitance: 110pF (including code) 120pF (including cable)
Impedance 144kΩ (including cable, at 10kHz) 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 with moisture-permeability (replacement part: EP-234BR) high-quality artificial leather (replacement part: EP-234GR)
Cable PC-OCC parallel 6-strand, low-capacity wide cable, 2.5m full length 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 515g (including cable), 340g (without cable) 490g (including cable), 340g (without cable)
Body color brown gray
Specifications are subject to change without notice.

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