Fosi Audio Q4 Mini Gaming DAC & Headphone Amplifier

Digital Inputs

Headphone Output

Stated Headphone Range

Separate Power Requirement

Connect your preferred digital source

Use PC-USB for audio up to 24-bit/96 kHz, or optical and coaxial inputs for up to 24-bit/192 kHz. Choose the input for your setup and connect the Q4 to its separate 5 V power supply.

Adjust the sound at your desk

Dedicated bass and treble controls let you tune the tonal balance without opening software. The front volume control and headphone socket keep everyday listening adjustments within reach.

Keep the Exact Model and Signal Path Clear

Q4 accepts PC-USB, optical or coaxial digital input and needs separate 5 V power. USB audio is up to 24-bit/96 kHz; optical/coaxial are up to 24-bit/192 kHz. Its stated headphone range is 16–200 ohms.

Choose the Connected Equipment for Its Actual Role

Match the product’s stated input and output connections to the source and destination. Keep microphone preamps, digital converters and headphone amplifiers in their appropriate roles, checking cable wiring and power requirements before completing the recording or listening chain.

Plan Power and Gain for the Complete Setup

Use the model’s stated power arrangement and supported control settings for the connected devices. Choose sufficient recording headroom or a comfortable listening level, checking the source and destination rather than treating a connector shape as proof of every function.

Which signal path and version should I plan for?

Q4 accepts PC-USB, optical or coaxial digital input and needs separate 5 V power. USB audio is up to 24-bit/96 kHz; optical/coaxial are up to 24-bit/192 kHz. Its stated headphone range is 16–200 ohms.

Can it drive passive loudspeakers directly?

Use a suitable headphone output for headphones, or a line/preamp output into compatible powered speakers or a separate amplifier. RCA line connections do not provide a passive-speaker power amplifier.

What should I check for headphone cables?

Match the actual headphone output socket, wiring and cable. A plug adapter does not convert a single-ended headphone into a balanced connection; Atom Amp 2’s 4.4 mm socket remains single-ended.

Does the highest format apply to every input?

Use the format supported by the selected input, source, driver and application. USB, optical and coaxial paths may have different limits; an advertised maximum is not the format of every recording or music file.