Singxer American Version SA-1V2 Fully Balanced Discrete Class A Headphone Amplifier High Performance Preamplifier

Singxer American Version SA-1V2 Fully Balanced Discrete Class A Headphone Amplifier High Performance Preamplifier

Description:
- 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.
- The amplifier circuit adopts the class AB architecture developed by ourselves. The differential input tube adopts for ROHM ultra-low noise audio dedicated tube. The tubes are purchased in large quantities and then selected by manual precision matching to ensure the consistency of the differential tube. For other tubes, we use SMD twin tubes with excellent consistency to ensure better performance.
- 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 tube to output in parallel to ensure low enough internal resistance and strong driving force; it can be done calmly even in large dynamics.
- 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.
- SA-1 is a high-performance fully balanced, fully discrete Class A amp/preamp.
- Support global voltage AC100V-240V, no need to switch.

Ultra-low Distortion:
- THD+N -120db at 1khz A-weighted 20-22khz
- When outputting 50mv at low gain, THD+N still has -96db at 1khz A-weighted 20-22khz.

Ultra-low Noise:
- At low gain, the bottom noise is 300nV RMS A-weighted 20-22khz (tested after amplification by LNA), the direct test value of AP2522 is 0.66uV.
- At maximum output, SNR and DNR are 147db.

Multi-function and Multiple Play Methods:
- Support single-ended balanced input, free switching.
- 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 pre-mode.
- Support high and low gain design, when the gain is low, you can easily connect various earplugs, ultra-high sensitive earplugs, etc. (still can maintain inaudible bottom noise). When the gain is high, you can push a variety of big food headphones, including a variety of high resistance coils, low resistance flat panels, and even ultra-low sensitivity headphones such as KK.
- Support high and low impedance output, suitable for high-impedance headphones when high-impedance, low-impedance headphones that require high current can be pushed; freely switch, you can enjoy powerful driving and control sound, you can also try the relax and calm analog flavor.

Balanced Output Power:
- 16ohms: 10000mW
- 32ohms: 5500mW
- 68ohms: 3100mW
- 120ohms: 2000mW
- 600ohms: 380mW

Single-ended Power:
- The corresponding balanced output power divided by four.

SA-1 Class A Mode:
- Balance 16ohms load: below 500mW
- Balance 32ohms load: below 1000MW
- Balance 68ohms load: below 3000MW
- Balance loads above 68ohms: almost all power is Class A

SA-1 Headphone Amplifier Gains:
- Single ended input, single ended output: low gain is 0dB, high gain is 11dB.
- Single ended input, balanced output: low gain is 6dB, high gain is 17dB.
- Balanced input, single ended output: low gain is -6db, high gain is 5db.
- Balanced input, balanced output: low gain is 0dB, high gain is 11dB.

LOW-Z (low resistance mode), HI-Z (high resistance mode):
- The low impedance output impedance is 0.25ohms (balanced) and 1.1ohms (single ended).
- The high impedance output impedance is 10ohms (balanced) and 11ohms (single ended).
- When outputting the front-end, the single ended impedance is 22ohms and the balanced impedance is 45ohms.

Specification:
- Product size: 234 x 170 x 46mm
- Net weight: 1.8kg

Precaution:
- Based on the SA-1 ear amplifier design concept of full balance, the maximum optimization of full balance has been made. Therefore, it is recommended that the optimal usage method is: balanced input, balanced output, followed by single ended input, balanced output.
- If single ended input is required, it is recommended to also use single ended input; It is not recommended to use balanced input and single ended output.
- For high sensitivity headphones such as earplugs, it is not recommended to use high gain mode.

Package Included:
- 1 x Headphone Amplifier
- 1 x Power Cable