SPECIFICATIONS
SA-2 Class A Mode:
Balanced 16-ohm load: Below 400mW;
Balanced 32-ohm load: Below 800mW;
Balanced 64-ohm load: Below 1600mW;
Balanced loads above 64 ohms: Nearly all power is Class A

SA-2 Gain Settings:
1. Single-ended input to single-ended output: Low gain = 0dB, High gain = 12.8dB;
2. Single-ended input to balanced output: Low gain = 6dB, High gain = 18.8dB;
3. Balanced input to single-ended output: Low gain = -6dB, High gain = 6.8dB;
4. Balanced input to balanced output: Low gain is 0dB, high gain is 12.8dB

Input impedance:
Single-ended: 33K ohms
Balanced: 20K ohms

Input sensitivity:
Balanced input to balanced output:
High gain: 4.2V RMS
Low gain: 18V RMS
Single-ended input to balanced output:
Low gain: 9V RMS
Single-ended input balanced output: High gain: 2.1V RMS

Headphone Output Impedance:
Switch LOW-Z is low-impedance mode, HI-Z is high-impedance mode;
Low-impedance output impedance: 0.15 ohms (balanced) and 1.1 ohms (single-ended);
High-impedance output impedance: 10 ohms (balanced) and 11 ohms (single-ended);
Preamp Output: Single-ended impedance 75 ohms, balanced impedance 150 ohms

Dimensions of the chassis: 234mm × 170mm × 46mm, excluding the height of the chassis feet and protruding connectors at the rear.
Unit weight: approximately 1.8kg
Carton dimensions: 350mm × 230mm × 110mm
Shipping package weight: approximately 2.3kg

Upgrade specs:
1. Output power increased from SA-1's 5.5 watts into 32 ohms to 10 watts into 32 ohms, with a maximum of 15 watts into 20 ohms; supports headphones down to 8 ohms minimum impedance.
2. Circuit optimization maintains ultra-low distortion even at high power output.
3. Enhanced thermal management with a copper block + aluminum alloy heatsink design;
4. Reduced impedance at the balanced headphone output, boosting current drive capability for greater pushing power;
5. Optimized PCB routing, adjusted DC bias circuitry, added DC servo design, and incorporated a GND/LIFT mode switch;
Supports global AC voltages 100V-240V without switching; identical hardware for China, Europe, US, and UK versions, differing only in included power cords.