LEAUDIO SINGXER SA2 Class A Fully Balanced Discrete Headphone Amplifier & Preamplifier

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.

• The SA-2 employs a true quad-channel, fully independent, all-discrete Class A amplifier circuit design. Its pure analog amplification and control circuitry eliminate EMI interference from digital control, ensuring faithful reproduction of music's analog character.
• Supports single-ended and balanced inputs with seamless switching;
• Features multiple output interfaces: XLR 4-pin true balanced, 6.35mm single-ended, and 4.4mm balanced connectors; also functions as a preamp with single-ended and balanced outputs;
• Offers high/low gain settings—low gain effortlessly drives in-ear monitors and ultra-sensitive earphones (while maintaining inaudible noise floor); High-gain mode drives demanding headphones including high-impedance dynamic drivers, low-impedance planar magnetic drivers, and even ultra-low-sensitivity models like KK.
• Supports high/low impedance output: High impedance suits high-impedance headphones; low impedance drives low-impedance but high-current-demand headphones. Switch freely between powerful, controlled sound and relaxed, analog-flavored audio.