H4 - Headphone amplifier DEERSYNC - Free user manual and instructions
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| Product Type | Headphone Amplifier |
| Brand | DEERSYNC |
| Model | H4 |
| Dimensions (W x H x D) | 110 x 60 x 25 mm |
| Weight | 180 g |
| Power Supply | USB-C (5V/1A) or built-in battery (1500 mAh) |
| Input | 3.5 mm stereo jack |
| Output | 3.5 mm stereo jack / 6.35 mm jack |
| Frequency Response | 20 Hz - 20 kHz |
| Output Power (32Ω) | ≥ 100 mW per channel |
| Signal-to-Noise Ratio | ≥ 110 dB |
| Total Harmonic Distortion + Noise | ≤ 0.001% |
| Impedance Range | 16 - 300 Ω |
| Gain Settings | Low, Medium, High |
| Battery Life | Up to 10 hours |
| Charging Time | Approximately 2 hours |
| Controls | Volume knob, power switch, gain switch |
| Indicators | LED power and charging status |
| Materials | Aluminum alloy case |
| Maintenance | Wipe with dry soft cloth, avoid liquids |
| Safety | Class III equipment, low voltage |
| Compatibility | Smartphones, PCs, DAPs, portable devices |
| Accessories Included | USB-C cable, 3.5mm cable, manual |
Frequently Asked Questions - H4 DEERSYNC
How do I connect the DEERSYNC H4 to my smartphone?
Use the included 3.5mm audio cable to connect your smartphone's headphone jack to the Input port of the H4. For phones without a headphone jack, use a USB-C to 3.5mm adapter. Then connect your headphones to the Output port.
Can I use the H4 while charging?
Yes, the DEERSYNC H4 supports pass-through charging. You can use the amplifier while it is connected to a power source via USB-C.
What is the battery life of the H4?
The built-in 1500 mAh battery provides up to 10 hours of continuous playback under normal volume levels.
How do I change the gain setting?
The gain switch is located on the side of the amplifier. Select Low for sensitive headphones (16-32Ω), Medium for typical headphones (32-150Ω), and High for high-impedance headphones (150-300Ω).
Does the H4 work with wireless Bluetooth headphones?
No, the DEERSYNC H4 is a wired amplifier. It requires a physical connection via 3.5mm or 6.35mm jack. For Bluetooth headphones, use a Bluetooth receiver with the H4.
What is the output power of the H4?
The H4 delivers ≥ 100 mW per channel into 32Ω, sufficient to drive most headphones to high volumes with low distortion.
How do I clean the H4?
Use a soft, dry cloth to wipe the aluminum case. Avoid using liquids or abrasive cleaners. Keep the ports free of dust.
Can I use the H4 with a desktop computer?
Yes, the H4 is compatible with any device that has a 3.5mm audio output, including PCs, laptops, and DAPs. It can also be used as a DAC if connected via USB (check your model).
What headphones impedance range does the H4 support?
The H4 is designed for headphones with impedance between 16Ω and 300Ω. Use the gain settings to match your headphones.
Is the DEERSYNC H4 a portable device?
Yes, the H4 is compact and lightweight, with dimensions 110x60x25 mm and weighing only 180g. It fits easily in a pocket or bag.
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USER MANUAL H4 DEERSYNC
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Product information
Brand : DEERSYNC
Model : H4
Category : Headphone amplifier