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V2 Updates:
1. Adjusted the output impedance to enhance the current output capability, low resistance output impedance of 0.25 ohms (balanced) and 1.1 ohms (single-ended); high resistance output impedance of 10 ohms (balanced) and 11 ohms (single-ended); balanced output port has more thrust;
2. Optimized PCB alignment and adjusted the DC bias design of the line to improve DC performance.
Features: 1.Ultra-low distortion: THD+N -120db @1khz A weighting 20-22khz, When outputting 50mv at low gain, THD+N still has -96db @1khz A weighting 20-22khz. 2.Ultra-low noise: At low gain, the bottom noise is 300nv RMS A weighted 20-22khz, the direct test value of AP2522 is 0.66uv, At maximum output, SNR and DNR are 147db. 3.SA-1 adopts a true four-way fully independent fully discrete Class A amplifier circuit design, pure analog amplifier circuit and pure analog control, without EMI interference caused by digital control, in order to faithfully restore the analog flavor of music. 4.The amplifier circuit adopts the class AB architecture developed by ourselves. The differential input transistor adopts ROHM's ultra-low noise audio dedicated transistor. The transistors are purchased in large quantities and then selected by manual precision matching to ensure the consistency of the differential transistor. For other transistor, we use SMD twin transistor with excellent consistency to ensure better performance. 5.The final output circuit uses multi-stage current amplification, similar to the architecture of a high-power amplifier. Each channel uses 2 pairs of ON Semiconductor's 4A mid-power transistor to output in parallel to ensure low enough internal resistance and strong driving force; it can be done calmly even in large dynamics. 6.Perfect protection functions: overcurrent, overload, overheating, short circuit, DC protection, start-up delay, and the output relay can be cut off immediately when shutting down. Multi-function and multiple play methods: 1. Support single-ended balanced input, free switching. 2. Support multi-output interface, XLR 4-pin true balanced, 6.35 single-ended, 4.4 balanced interface; also supports single-ended and balanced output as a front-end mode. 3. Support high and low gain design, you can easily connect all kinds of earplugs, super sensitive earplugs, etc. 4.When the gain is high, you can push a variety of big headphones, including a variety of high-resistance moving coils, low-resistance flat panels, and even ultra-low sensitivity headphones such as KK Earphone. 5.Support high and low impedance output, suitable for high-impedance headphones when high-impedance, and low-impedance headphones that require high current.
6.Large balanced output power:16Ω 10000mW32Ω 5500mW68Ω 3100mW120Ω 2000mW600Ω 380mW Volume: 234MM*170MM*46MM weighT :1.8KG
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