STAX SRM – 727II

This SRM-727 II amplifier for Stax electrostatic headphones is compatible with all models from the brand. It has the unique feature of operating in Class A.

Warm sound and true musicality are on full display. The input connectivity includes two RCA lines and one XLR. This amplifier can thus be connected to the best audio sources, with SACD players and high-end DACs leading the pack. Finally, it is equipped with two headphone outputs.

• Tube amplification (ECC 99 × 2).
• DC-coupled Class A output stage without negative feedback.
• Symmetrical signal circuit construction.
• Volume/balance control via four-way potentiometer.

Measurements

• Frequency response: 20 Hz - 115 kHz (+0, -3 dB)
• Input level: 200 mV Gain: 54 dB (× 500)
• Harmonic distortion: < 0.01% (100 Vrms / 1 kHz)
• Input impedance: 50 kOhms (RCA input), 100 kOhms (XLR input)
• Maximum output voltage: 340 Vrms (1 kHz)
• Bias voltage: DC580 V × 2 (PRO bias)

Connectivity

• 1 switchable input on the connection panel.
• Either balanced (3-pin XLR connectors) or unbalanced (RCA/RCA connectors)
• 1 unbalanced output (RCA/RCA connectors)
• 2 headphone outputs

General

• Power consumption: 46 W.
• Dimensions W x H x D: 195 x 100 x 388 (with knob and connectors 477) mm
• Weight: 5.1 kg