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The Singxer SA-1 V2 stands as a comprehensive and high-performance headphone amplifier and preamplifier, utilizing Class A architecture and fully symmetrical discrete circuits. In its second iteration, the Singxer SA-1 V2 boasts an enhanced circuit design, resulting in reduced output impedance and increased driving force.

SINGXER SA1 V2 Balanced Headphone Amplifier Class A
The Singxer SA-1 V2 is a complete, high-performance headphone amplifier and preamplifier based on Class A architecture and fully balanced discrete circuits. Version 2 of the Singxer SA-1 features an optimized circuit design for lower output impedance and greater thrust.

Full analog headphone amplifier
Completely analog, no EMI interference caused by digital control disturbs the audio signal. ROHM input transistors ensure very low noise and excellent performance. The output stage uses multi-stage current amplification, similar to that found in a high-power amplifier. Each channel incorporates 2 pairs of ON Semiconductor 4A transistors to ensure sufficiently low internal resistance and high output power. These circuits also incorporate comprehensive protection against overcurrent, overload and short-circuit, as well as thermal protection, DC protection and turn-on time delay.

Verious inputs and outputs
The SA-1 V2 also features a full range of connectors. Inputs include unbalanced RCA and balanced XLR. For headphone outputs, the amplifier offers balanced 4.4mm jack and 4-pole XLR, and unbalanced 6.35mm jack. On the preamplifier output side, the SA-1V2 offers an unbalanced RCA output and a balanced XLR output.

Special Features
To adapt to all types of headphones, whether high-sensitivity or high-impedance models, the SA-1 V2 offers impedance selection (low or high) via a bipolar switch on the front panel. A second switch selects the source (RCA or XLR). A third switch selects the impedance resistance mode for headphone outputs: LOW-Z is low resistance mode, HI-Z is high resistance mode. On the preamplifier outputs, the unbalanced output impedance is 22.5 ohms and the balanced output impedance is 45 ohms.

An analog amp from a digital heavyweight
Since 2011, Singxer has operated as an ODM and OEM in the audio industry as well as developed their own DACs and digital interfaces. Best known for their work in digital audio, they’ve made technical achievements in clock systems, phase-locked loop technologies, and more. In a bit of a departure for a company that so heavily favors digital products, Singxer has now released the SA-1, a fully balanced pure analog class A amplifier.

Call it beginner’s luck or pure talent: Singxer has knocked this one out of the park. The SA-1 offers superb amplification, vanishingly low noise floor, and nominal distortion. It’s a great choice for anyone looking to graduate to a high-end balanced amplifier that can double as a preamp.

Fully independent Class A analog amplifier
The Singxer SA-1 is a class A pure analog amplifier. Using simple circuits that draw the same amount of current and consume the same amount of energy whether receiving a signal or not, this is the most straightforward of amplifier types. It isn’t subject to electromagnetic interference caused by digital components, so its total harmonic distortion and signal-to-noise ratio are exceptionally low.

Seven inputs and outputs
The Singxer SA-1 can be used as a headphone amplifier or preamplifier. As a headphone amplifier, it supports balanced XLR input, RCA input on the back panel, and three outputs on the front panel: 4-pin balanced XLR, balanced 4.4, and single-ended 6.35. As a preamplifier, it supports balanced XLR input, RCA input, and two outputs: balanced XLR and RCA.

Product highlights
Fully independent class A analog amp
Super clean output with low distortion and low noise floor
Seven inputs and outputs
Fully balanced architecture
Headphone amplifier and preamplifier
Amplification type: Class A
Two gain modes: low/ high
Version two includes upgrades to the PCB routing and DC performance.
Specs
Inputs: Balanced XLR, RCA
Outputs: Balanced XLR, RCA, Balanced 4.4mm, Balanced 4-pin XLR 4, Single-ended 6.35mm
SNR: 126dB
Dynamic range: 147dB A-wt
THD+N:
0.000078% balanced input and no output load
0.000128% balanced input and 33Ω output load
Noise level:
0.66µV Max output, SNR / DNR 147dB
300nV RMS Low gain, A-Weighting, 20Hz-22kHz
Output power
6480mW 32Ω
2000mW 120Ω
380mW 600Ω
Power supply: 100-240V AC, 50/60Hz
Low-resistance output impedance: 0.25Ω (balanced), 1.1Ω (single-ended)
High-resistance output impedance: 10Ω (balanced), 11Ω (single-ended)
Dimensions: 9.2 x 6.6 x 1.8” (234 x 170 x 46mm)
Housing material: Aluminum
Color: Black
Weight: 3.9lbs (1.8kg)
What’s included
1x Singxer SA-1
1x Power cable