STAX SRM-007TII Earspeaker Driver / Headphone Amplifier

SKU: FM883
Price: US$ 1989.98
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  • Have transparent and clear sound quality
  • Adopt a rectifier circuits combining low-noise
  • Improved circuit raises the frequency response
  • Low-ripple DC power source improves the SN ratio

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The operational principle of the electrostatic condenser Earspeaker /Headphone type is based on a system whereby plus and minus output signals are input by push-pull into two electrodes sandwiching a diaphragm with a high level of accuracy and equidistantly, resulting in the vibration of an ultra-thin membrane through the repulsive force and suction force of static electricity, which is then converted into sound. The balance method, which is considered to be the ideal for amplification, is thus extended to speakers. The electrostatic system entails input by balance, output by balance, and sound conversion by balance, and, in realizing all these features, constitutes the perfect balance system. It is the only system that makes it possible to listen to sound in the ideal manner permitted by the balance system. The new SRM-007tII is our flagship model of a driver unit intended exclusively for earspeakers characterized by their wide range, high dynamic range and outstanding operating features with full allowance made for SACD and other new-generation high-density formats. The ultra-light polymer film, only a few microns thick, realizes unprecedented response and a high degree of resolution. Since it is driven on all sides, there is almost no partitioned vibration and there is no phase distortion. Nor is there any imbalance in the sound quality of the unit or distortion caused by the network. Electromagnetic distortion also does not occur. It opens up on the world of high sound quality that is the mark of headphone listening, a world characterized by the absence of need for large output, the high degree of freedom permitted by the use of high sound quality elements for use with small signals, and the even balance between left and right unaffected by acoustic conditions in the listening room.


IMPROVED FREQUENCY RESPONSE Newly improved circuit raises the frequency response to 100kHz (from 70kHz) to accommodate newer generation audio formats such as SACD and DVD-A.

PURE BALANCE AMPLIFIER 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 inversion amplifier.

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 high-voltage dual triode tube 6FQ7(6CG7) delivers straightforward properties that are transparent and clear sound quality.

INPUT STAGE Employs Hand pick low noise FET and 6 acoustic high sound quality relays. Simultaneous switching system adopted from SRM-T2 , input source is isolated of direct current and no interference between different devices.

HIGH QUALITY VOLUME CONTROL High sound quality quadruple volume unit which makes XLR inputs as well as any analog line level inputs possible





:Vacuum tube output stage Low noise dual FET input Class A operation, Pure balance DC amplifier configuration Earspeaker driver unit
Vacuum Tube    :4 (6FQ7 / 6CG7)
Frequency Response    :D C to 100,000Hz +0,-1.5dB w/ SR-007 or SR-404
High Harmonic Distortion    :Max. 0.02% (with 1kHz, 100V r.m.s. )
Gain    :54dB (x500)
Input Terminal    
:3 ( XLR x 1, RCA x 2) with 1 RCA parallel out
Rated Input Level    :200mV / 100V Outputs
Max. Input Level    :30V r.m.s. at min. volume
Input Impedance    :50Kohm, 50kohm x 2 during balance
Max. Output Voltage    :340V r.m.s. (1kHz)
Standard Bias Voltage    :P RO 580V x 2
Power Voltage Frequency    :117V (50Hz / 60Hz)
Power Consumption    :55W
Temperature & Humidity    :0 to 35ºC / 90% max. without condensation
Dimensions    :7.7 (W) x 4.1 (H) x 16.5 (D) in
Weight    :10.4lbs



Condition: Brand new
Technical Specifications:
Type: Push-pull electrostatic circular sound element
open-air type enclosure
Impedance: 145k Ohms (10kHz)
Frequency Response: 5 - 42,000 Hz
Sensitivity: 101dB / 100V r.m.s. 1 kHz
Maximum sound pressure level: 118dB/400Hz
Bias Voltage: 580V DC
Left & Right Channel Identification: Left (L) and Right (R) indicators are provided at the cable arc part (left). Left channel cable is marked with a solid gold line. Right channel is marked with a dotted Line.
Ear Pads: Genuine leather (Lamb)
Cable: Silver-plated 6N (99.99999%) OFC low-capacity wide cable 2.5m
Ambient Temperature & Humidity: 0 to 35 celcius / 90% max. without condensation
Cord Length: 2.5 meters / 8.2ft
Weight: 454gr without cable / 596gr with cables
Recommended Driver: STAX SRM-007Ta, STAX SRM-727a, STAX SRM-600LIMITED
Warranty: 1 year Japan warranty



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 (R) 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 specification and appearance of the product may be changed without prior notice in order to make improvements.
Repairs of the product should be entrusted to the official dealer from whom it was purchased or to an official distributor.
*The specification and appearance of the product may be changed without prior notice in order to make improvements.
*Repairs of the product should be entrusted to the official dealer from whom it was purchased or to an official distributor.

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