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.
NEW THIN-FILM "SUPER ENGINEERING PLASTICS" MATERIAL
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.
The emitter-follower circuit with high-voltage bipolar transistors adopted for the output stage of the SRM-323S enabled low output impedance resulting in increased drivability and wide high-frequency dynamic range. Moreover, the power transformer equal to that of the SRM-006tS has been adopted to achieve more powerful derivability. One simple RCA input is equipped with a parallel-out terminal directly providing the incoming signal. Two 5-pin output sockets are connectable to all pro-bias compatible earspeakers. The SRM-323S employs a double-axis volume controller to control left-and -right channel volume level independently without using a balance volume controller.
| Type || :Push-Pull electrostatic oval sound element, Open-Air type enclosure |
| Frequency Response || :7 - 41,000Hz |
| Capacitance || :120pF (including cable) |
| Impedance || :132k Ω (10kHz) |
| 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 || :PC-OCC parallel 6-strand, low-capacity cable, 2.5m full length |
| Ambient Temperature & Humidity || :0 to 35ºC / 90% max. without condensation |
| Weight || :12oz without cable / 1.1lb with cable |
| Type || |
:All-stage semiconductors, Low-noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
| Frequency Response || :DC to 60,000Hz (with 1 SR-307) |
| High Harmonic Distortion || :Max 0.01% (1kHz at 100V r.m.s. ) |
| Gain || :60dB (x1000) |
| Input Terminal || |
:1 RCA with 1 RCA parallel out
| Rated Input Level || :100mV / 100V Outputs |
| Max. Input Level || :30V (at minimum volume level) |
| Input Impedance || :50KΩ(RCA) |
| Max. Output Voltage || :400V r.m.s. (1kHz) |
| Standard Bias Voltage || :PRO 580V x 2 |
| Power Voltage Frequency || :117V (50Hz / 60Hz) |
| Power Consumption || :30W |
| Temperature & Humidity || :0 to 35ºC / 90% max. without condensation |
| Dimensions || :5.9 (W) x 3.9 (H) x 14.2 (D) in |
| Weight || :6.4lbs |
| Color || :Silver |
Specifications and appearance are subject to change for improvement.