Q4 - Headphone amplifier Fosi Audio - Free user manual and instructions
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| Product Type | Headphone Amplifier / DAC |
| Model | Q4 |
| Brand | Fosi Audio |
| Dimensions | Approx. 10.5 x 6.5 x 2.5 cm (4.1 x 2.6 x 1.0 in) |
| Weight | Approx. 150 g (5.3 oz) |
| Power Supply | USB-C (5V, 1A) |
| Input | USB-C (digital), 3.5mm AUX (analog) |
| Output | 3.5mm headphone jack |
| Frequency Response | 20 Hz – 20 kHz (±0.5 dB) |
| Signal-to-Noise Ratio (SNR) | ≥ 110 dB |
| Total Harmonic Distortion (THD+N) | ≤ 0.005% |
| Output Power | Up to 100 mW per channel (32 Ω) |
| Impedance Range | 16 – 300 Ω |
| Volume Control | Analog potentiometer (front panel) |
| Bass Boost | Yes (toggle switch) |
| DAC Chip | Compatible with up to 24-bit/192kHz |
| Housing Material | Aluminum alloy |
| Included Accessories | USB-C cable, 3.5mm AUX cable, user manual |
| Cleaning Instructions | Wipe with a soft, dry cloth. Do not use liquids or abrasive cleaners. |
| Safety Warnings | Avoid exposure to moisture, extreme temperatures, and direct sunlight. |
| Replaceable Parts | None user-serviceable. Contact support for repairs. |
| Repairability | Not intended for user repair. Refer to authorized service. |
Frequently Asked Questions - Q4 Fosi Audio
What devices can I connect to the Fosi Audio Q4?
You can connect any device with a USB output (computer, smartphone, tablet) or a 3.5mm headphone jack (MP3 player, phone, etc.). The Q4 works as both a DAC and headphone amplifier.
Does the Q4 require external power?
No, it is powered via USB-C. Simply plug it into a USB power source or your computer.
How do I use the bass boost function?
Toggle the Bass Boost switch on the front panel to enhance low frequencies. The effect is subtle and adjustable via the volume knob.
Can I use the Q4 with high-impedance headphones?
Yes, it supports headphones with impedance from 16 to 300 ohms. For very high impedance, output power may be limited.
What is the maximum audio resolution supported?
Via USB, it supports up to 24-bit/192kHz audio. Analog input passes through unchanged.
How to clean the device?
Use a soft, dry cloth to wipe the exterior. Avoid liquids, abrasive cleaners, or inserting objects into ports.
Does the Q4 work with gaming consoles?
Yes, if the console has a USB audio output or a 3.5mm jack. For PS4/PS5, use the USB port and adjust settings.
What should I do if there is no sound?
Check connections, ensure volume is turned up, and verify that the source device is outputting audio. Try both USB and AUX inputs.
Is the Q4 compatible with Mac and Windows?
Yes, it is plug-and-play on both. For Windows, you may need to select the Q4 as the default audio device in sound settings.
Can I leave the device plugged in all the time?
Yes, it is designed for continuous use. However, unplug during cleaning or if not used for extended periods.
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USER MANUAL Q4 Fosi Audio
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Product information
Brand : Fosi Audio
Model : Q4
Category : Headphone amplifier