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Place the audio system in a well-ventilated, cool, dry, clean location, away from heat sources, vibration, dust, moisture, or cold.
Use only the specified voltage; using higher voltage is dangerous and may cause fire or damage.
Do not attempt to modify or repair the unit; contact qualified service personnel for any service needs.
Disconnect the power cable from the AC outlet if the unit will not be used for extended periods.
Product quality is guaranteed; 7-day return/repair for defects, free repair for one year under normal use.
Purchase date is based on invoice or receipt date; online purchases can use screenshots.
Excludes damage from human factors, unauthorized modification, non-specified accessories, tampered stickers, or lack of proof of purchase.
Warranty service is mail-in repair, applicable to mainland China; other regions follow local regulations.
Features an ultra-low distortion precision linear feedback circuit (PLFC) with distortion as low as 0.00008%.
Ultra-low noise power supply design ensures output noise is as low as 1.3uV.
Ultra-compact design, ideal for desktop headphone systems.
High precision, low temperature drift resistors ensure performance is unaffected by temperature.
Utilizes high-quality relays with a popless sound design for a smooth user experience.
Features high precision, low noise 256-level relay volume control for accurate adjustments.
Provides 4W output into 16 Ohms and 2W into 32 Ohms.
Offers a wide frequency response from 20Hz to 500kHz.
Features three-stage gain control (high, medium, low) for versatile use.
Headphone amplifier includes comprehensive protection: DC, overvoltage, and thermal protection.
Employs a high-efficiency and ultra-low noise power system for optimal performance.
Supports both balanced (XLR) and unbalanced (RCA) line inputs.
Offers multiple headphone outputs: balanced, 4.4mm balanced, and unbalanced.
Details output power at different impedances: 4W (16Ω), 2W (32Ω), 1W (300Ω), 500mW (600Ω).
Achieves a high Signal-to-Noise Ratio (SNR) of 137dB.
Features extremely low residual noise of 1.3uV.
Total Harmonic Distortion plus Noise (THD+N) is -121dB or 0.00008% at 1kHz/32Ω.
Total Harmonic Distortion plus Noise (THD+N) is -120dB or 0.0001% at 20-20kHz/32Ω.
Total Harmonic Distortion (THD) is less than -125dB or 0.00006%.
Input impedance is 47kΩ.
Output impedance is close to 0Ω.
Frequency response ranges from 20Hz to 500kHz (-3dB).
Details gain settings (L, M, H) for different input/output combinations.
Requires a DC 15V power supply.
Maximum power consumption is less than 30W (EN60065).
Standby power consumption is less than 0.1W.
Unit dimensions are 100x62x195mm (WxHxD).
The unit weighs 0.75kg.
Replace the battery with a new one if the remote control is ineffective even at close range.
Remove the remote control's batteries if it will not be used for an extended period.
Dispose of used batteries in accordance with local environmental regulations.
Details the functions of each button on the remote control for operating the A20h.
Notes regarding battery type (AAA) and initial operation sequence (press B key first).
Identifies controls like the knob, infrared receiver, and display screen.
Details output jacks (6.35mm, 4.4mm), RCA input, and power input (DC 15V).
Specifies balanced and unbalanced input connections.
Lists available headphone output jacks: balanced, 6.35mm, and 4.4mm.
Advises turning down volume before connecting headphones and avoiding long listening times.
Explains how to select between balanced (In1) and unbalanced (In2) inputs.
Describes the gain adjustment options: Low (L), High 1 (H1), and High 2 (H2).
Details the three brightness levels available: Brightness 1 (bL1), 2 (bL2), and 3 (bL3).
General| Input Impedance | 10kΩ |
|---|---|
| Input | RCA |
| Output | 3.5mm |
| Type | Amplifier |
| Frequency Response | 20Hz - 20kHz |
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