It had been packed and stored for a long time. At that time, it was considered a famous instrument with good quality of mid and high tones.


Condenser speakers are characterized by good sound quality with low distortion and good separation in the mid-range and wide-range because there is no split vibration in principle (bass and loud volume and large amplitude are not good).
They are also lightweight due to the absence of a magnetic circuit. It is ideal for long-time use in a nest egg.
The tone control slightly enhances the bass, making it ideal for low volume, long duration applications.
It is also high-impedance, so it may produce residual hum (boomy sound) depending on home power supply conditions. Please select the outlet polarity.
The earpads have been disinfected with alcohol.
(For better sound quality, three film capacitors were added to the SRD5 power supply. (For better sound quality, three film capacitors have been added to the SRD5 power supply section, making it equivalent to SRD6.)

https://www.kenrockwell.com/audio/stax/new-sr-3.htm
Impedance: around 130 k Ohms at 10,000 Hz.
Capacitance: around 120 pF.
Sensitivity: around 95-100 dB at 100 V RMS.
Frequency Range: 30 - 25,000 Hz, but I had no problems getting 20 Hz out of it.



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