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Product description Literally Plug and Play Fosi Audio Q4 DAC & Headphone Amplifier A compact and lightweight, user-friendly desktop audio device. Operation Systems: XP/Win7/Win8/Win10/Win11/MAC/Linux Your Sound Perception Will be Revolutionized Q4 is an entry-level all-in-one DAC and headphone amplifier. It is plug-and-play and does not require any driver. It has the characteristics of high signal-to-noise ratio and low distortion. PC-USB Sampling Frequency: 24bit/96kHzOptical/Coaxial Sampling Rates: 24bit/192kHzSNR: >105dB; THD: 0.01%; Bass and Treble Range: ±6dB Input: PC-USB/Optical/Coaxial; Output: 3.5mm Headphone/RCA Previous page Accommodate Various Home Audio Systems Equipped with USB/Optical/Coaxial inputs and RCA/Headphone outputs for diverse connection needs. DAC + Headphone Amplifier A compact, lightweight, and user-friendly desktop device that adapts to your varied needs. Perfect for Gaming Low latency and an outstanding sound stage provide an incomparable feeling of immersion. A Little Gem for Music Lovers SNR up to 105dB keeps the sound clear and pure at all times and effectively resists interference. Next page 1 Home Audio System 2 Desktop Device 3 Low Latency 4 Anti-Interference Previous page Next page 1 Bass & Treble Controls 2 Audio Ports 3 Corner Design Can Q4 output analog stereo audio through both the 3.5mm headphone jack and the RCA red/white jacks at the same time? Q4 will mute the RCA output when headphones are plugged in. How do I connect Q4 to my computer with USB input? Your other USB cables must support OTG function. -For iPhone: Use a USB B to Lightning OTG Cable. -For Android: Use a USB B to TYPE C Cable. Where is the 0db position (Q4)? The 0db position is at 12 o'clock on the knob. Does Q4 support PS5? Yes, it supports PS5. Can RCA output be connected to a soundbar (e.g., AUX input) (Q4)? Yes, it can work. Quick Troubleshooting Guide 1. Common Audio Issues - One Channel Has Sound or Unbalanced Output: Ensure all cables are securely connected. Test with different cables and input modes. For RCA output, check speaker connections. For headphones, ensure the jack is fully inserted and try different headphones. - No Sound from USB: Use different USB cables and ports. Restart your computer and select the correct sound output device (e.g., HIFI Audio). Update or reinstall the USB driver. - White Noise or Static: Set the volume to 50% or lower. Ensure all cables are securely connected and test for interference from nearby devices. Use well-shielded cables and try different input modes. For headphones, use high-impedance headphones to reduce noise. 2. Connection and Compatibility - Connecting to a Computer: Ensure your USB cables support the OTG function. For iPhone, use a USB B to Lightning OTG Cable. For Android, use a USB B to Type-C Cable. Follow the setup guide for detailed instructions. - Connecting to a TV: Use a coaxial or optical cable. Ensure the TV is set to PCM/RAW mode and disable Dolby or DTS sound. Follow the setup guide for detailed instructions. - Power Issues: Ensure a stable power supply. Replace the power cable or adapter if necessary. Refer to the tutorial video for guidance. 3. General Tips: Driver Updates: If you encounter driver errors, update to the latest Microsoft driver (KB5050094) for compatibility. Volume Control: The TV remote cannot control the Q4 volume when connected via optical or coaxial. Use the Q4 volume knob instead. PS: Regarding the cables included in the package, there is a USB charging cable, an optical cable, and a PC-USB cable. Your Guide to Choosing the Right Headphone Amplifier Q4 Add to Cart K5 Pro Add to Cart SK01 Add to Cart SK02 Add to Cart PH04 Add to Cart PH05 Buying Options DS2 Add to Cart Customer Reviews 4.4 out of 5 stars 3,319 4.2 out of 5 stars 1,722 4.3 out of 5 stars 497 4.5 out of 5 stars 362 4.4 out of 5 stars 690 4.7 out of 5 stars 140 4.4 out of 5 stars 455 Price $69.99$69.99 $79.99$79.99 $71.99$71.99 $99.99$99.99 $32.99$32.99 — $59.99$59.99 Type DAC+Headphone Amp DAC+Headphone Amp Headphone Amplifier/Preamp DAC+Headphone Amplifier/Preamp Headphone Amp Headphone Amp DAC+Headphone Amp MAX Power Output - - 2400mW@32Ω(High Gain) 3.5mm: 280mW,4.4mm: 1100mW@32Ω 40mW@100 Ohm 310mW@32Ω 120mW@32 Ohm(SE) Input PC-USB+OPT+COA USB-C+OPT+COA+3.5mm Microphone 3.5mm line in USB + Optical 3.5mm AUX 3.5mm AUX Type C+ USB A Output RCA + 3.5mm Headphone RCA + 3.5mm Headphone line out, 3.5/6.35mm headphone 3.5/4.4mm Headphone, AUX/OPT 3.5mm Headphone ×4 3.5mm Headphone ×5 3.5mm & 4.4mm Headphone Treble & Bass Control ✔ ✔ ✔ ✘ ✘ ✘ ✘ THD ≤0.01% <0.003% <0.001% <0.001% - <0.001% <0.0001% SNR ≥105dB >110dB ≥108dB ≥120dB - ≥105dB ≥130dB Terminating Impedance 16-200 Ohm 16-300 Ohm 16-300 Ohm 16-300 Ohm 15-150 Ohm 16-300 Ohm 16-300 Ohm Work Voltage DC 5V USB-C/DC5V USB-C/DC5V USB-C/DC5V 12V/1.5A - -
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