What does an audio interface do?
An audio interface connects microphones and instruments to your computer for recording and sends audio back out to headphones or speakers for monitoring.
Research-based article drawn from our 27 music production reviews. Updated September 2026.
Short answer
An audio interface converts analog sound from microphones or instruments into digital audio your computer can record, then converts computer audio back into sound for headphones or speakers. It also provides input-level controls and microphone amplification. For recording, the practical priorities are suitable connections, enough simultaneous inputs, and stable drivers that keep monitoring delay manageable.
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How an audio interface fits into a recording setup
Think of an audio interface as the connection point between your recording equipment and your computer. A typical recording path is microphone or instrument, then interface, then recording software. For listening, audio travels from the software through the interface to your headphones or powered studio monitors.
The microphone preamp raises a microphone’s low-level signal before conversion. The input gain control lets you set the recording level; it is not the same as the headphone volume control. When setting gain, perform at the loudest level you expect to record and leave headroom rather than letting the input clip.
Connections need to match the source. Microphones, electric instruments, and line-level equipment can require different input settings. Some microphones also need phantom power. Check both the interface and microphone manuals before connecting equipment or enabling power. An interface handles capture and playback, while your recording software handles tasks such as arranging, editing, and mixing.
Why latency and drivers matter more than preamp marketing
Latency is the delay between making a sound and hearing it through your recording system. When you monitor through software, the signal must enter the interface, pass through the computer, and return to your headphones. That complete journey is round-trip latency. Too much delay makes singing or playing along with a track uncomfortable.
Driver quality matters because the driver manages communication between the interface and the computer. Our buying priority is stable drivers and manageable round-trip latency, not claims about preamp character. The Focusrite Scarlett Solo 3rd Gen uses mature, low-latency drivers; the Focusrite Scarlett 2i2 4th Gen also earns credit for consistently low driver round-trip latency.
For setup, use the manufacturer’s recommended driver and select the interface in your recording software. A smaller audio buffer generally reduces delay but increases the computer’s workload. Raise it if you hear clicks or dropouts. Direct-monitoring options and routing vary by model, so check your manual rather than assuming every interface works the same way.
Read the reviews: Focusrite Scarlett Solo 3rd Gen USB, Focusrite Scarlett 2i2 4th Gen USB
Do you actually need a separate audio interface?
A separate interface makes sense when you want to record an XLR microphone, connect suitable instrument sources, or build a setup around dedicated headphone and monitor connections. It is not a prerequisite for every kind of computer music production. If you are arranging sounds entirely inside software, start with your existing playback setup and identify the limitation you need to solve.
A USB microphone offers another route. The Logitech Creators Blue Yeti connects directly over USB and does not have an XLR audio interface connection. Our review finds it practical for spoken content, but software-monitoring latency can become an obstacle during vocal recording.
For an XLR example, the Audio-Technica AT2020 requires an audio interface with 48V phantom power. The Shure SM58 instead highlights the importance of adequate clean preamp gain. Neither purchase eliminates the need to consider your room: the AT2020 exposes room reflections, while our review finds the SM58 more forgiving in untreated spaces. Choose the recording approach before buying the interface.
Read the reviews: Logitech Creators Blue Yeti USB Microphone for PC, Audio, Shure SM58 Pro XLR Dynamic Vocal Microphone
Choose the inputs you need, then plan your monitoring
Count the sources you need to record simultaneously, especially microphones. The Focusrite Scarlett Solo 3rd Gen has one microphone input and one instrument input, so it cannot record a stereo microphone pair. It is our lower-cost baseline for single-source tracking. The Solo 4th Gen retains a single XLR microphone channel and prioritizes dependable drivers, with updated conversion performance and clear front-panel metering.
For two microphones at once, the Focusrite Scarlett 2i2 4th Gen is the more appropriate option. It has two preamps, supports stereo microphone setups, and provides separate monitor and headphone level controls. Pay for those capabilities when your sessions require them, rather than treating more inputs as an automatic improvement.
Budget for monitoring too. Use closed-back headphones for tracking to limit sound leaking into microphones; favor open-back headphones for mixing where the environment permits. The Audio-Technica ATH-M50X offers strong tracking isolation, but its emphasized low end complicates final mix decisions. If using speakers, treat the room before upgrading the monitors. An interface does not correct room acoustics.
Read the reviews: Focusrite Scarlett Solo 3rd Gen USB, Focusrite Scarlett Solo 4th Gen USB, Focusrite Scarlett 2i2 4th Gen USB, Audio
Frequently asked
- Does an audio interface improve sound quality?
- It can provide the connections, microphone amplification, and conversion needed for a suitable recording setup, but it will not automatically improve every recording. Microphone choice, placement, recording level, and room acoustics still matter. Choose an interface for practical requirements and driver reliability rather than expecting it to repair a poor recording environment.
- Do I need an audio interface for a USB microphone?
- Not for a USB microphone that connects directly to your computer. The Logitech Creators Blue Yeti, for example, offers driverless USB setup and has no XLR interface connection. If you later switch to an XLR microphone, plan for a compatible interface and check the microphone’s gain and power requirements.
- Can I use an audio interface without studio monitors?
- Yes. You can monitor through headphones connected to a suitable interface. Closed-back headphones are the practical choice when recording near a microphone because they reduce headphone bleed. Open-back headphones are generally preferable for mixing in a quiet environment. Check your interface manual for headphone connection requirements and available monitoring controls.
- What is the difference between an audio interface and a MIDI controller?
- An audio interface handles audio entering and leaving your computer. A MIDI controller sends performance instructions to software rather than serving as an audio recording input. The Akai Professional MPK Mini IV is a USB-C controller for MIDI entry and pad programming; monitoring responsiveness still depends on the host audio setup.