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Stax SR-407

The first SR-Λ (lambda) series was introduced 30 years ago, and now the 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 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.

Carefully selected high-quality components of audio grade are employed for the main circuit and greatly improved the tone quality.  High-quality relays are placed close to the input terminal to realize the shortest signal path, and the mutual interference between equipments is eliminated by switching the hot / cold side of the signal simultaneously.  Also the circuit constant has been looked over again in detail.

The balanced input via XLR terminal along with the custom-made double axis 4-gang volume controller enabled a full-balanced operation from input to sound element drive.

Class-A all-stage DC amplifier circuit configuration eliminated coupling capacitors throughout the signal path. High-voltage dual triode 6FQ7 / 6CG7 are employed in the output stage, and the input stage features a simple two-stage amplification using low noise FET that are hand selected.

One stereo XLR input is equipped to connect directly to the XLR balanced output of a high-class CD/SACD player. Also, two pairs of RCA inputs enable the unit to switch between connected source equipments. One of the two RCA inputs has a bypassing output that, for example, can be connected to your integrated amplifier for flexible system-up.

Type :Push-Pull electrostatic oval sound element, Open-Air type enclosure
Frequency Response :7 - 41,000Hz
Capacitance :110pF (including cable)
Impedance :144k 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 with moisture-permeability
Cable :PC-OCC parallel 6-strand, low-capacity wide cable, 2.5m full length
Ambient Temperature & Humidity :0 to 35ºC / 90% max. without condensation
Weight :12oz without cable / 1.1lb with cable


:Vacuum tube output stage Low noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
Vacuum Tube :2 (6FQ7 / 6CG7)
Frequency Response :DC to 80,000Hz +0,-3dB
High Harmonic Distortion :0.01% or less (1kHz at 100V r.m.s. )
Gain :60dB (x1000)
Input Terminal
:3 ( XLR x 1, RCA x 2) with 1 RCA parallel out
Rated Input Level :200mV / 100V Outputs
Max. Input Level :30V (at minimum volume level)
Input Impedance :50KΩ(RCA), 100kΩ (XLR)
Max. Output Voltage :300V r.m.s. (1kHz)
Standard Bias Voltage :PRO 580V x 2
Power Voltage Frequency :117V (50Hz / 60Hz)
Power Consumption :49W
Temperature & Humidity :0 to 35ºC / 90% max. without condensation
Dimensions :7.7 (W) x 4.1 (H) x 15 (D) in
Weight :7.5lbs
Color :Silver

Specifications and appearance are subject to change for improvement.