How to choose the right audio interface

Updated June 2026Independently researchedNo paid placement.

How many inputs and outputs do I actually need?

Start by looking at what you’ll record. A solo musician using one microphone and a guitar can get by with a two‑input interface like the Focusrite Scarlett 2i2 or Universal Audio Volt 2. If you record a stereo keyboard, an acoustic duo, or want to mic a guitar amp in stereo, look for a four‑input model such as the Scarlett 4i4 or Audient iD4 MkII. If you plan to record a full drum kit or a band live, you’ll likely need eight or more inputs. Interfaces like the Focusrite Scarlett 18i8 or the Behringer U‑Phoria UMC1820 offer enough channels without breaking the bank. Remember that you can always add more inputs later via ADAT expansion on many interfaces that include that port. Outputs matter too. If you want to connect multiple sets of studio monitors or send separate headphone mixes, look for an interface with at least four outputs (like the Scarlett 4i4) or a dedicated headphone output with independent mix control.

What makes preamp quality different between budget and pro interfaces?

Preamps are the first stage your microphone signal hits, and their quality directly affects noise floor, clarity, and how much clean gain you get. Entry‑level interfaces (often under a few hundred dollars) from brands like Focusrite, PreSonus, and Behringer have improved massively in recent years and are perfectly usable for home studios. Their preamps are clean but may have a slightly higher noise floor and less headroom than pricier models. Moving up to mid‑range interfaces such as the Universal Audio Apollo Solo or the Audient iD14 MkII, you get preamps with lower noise, more transparent sound, and often built‑in analog processing. The Apollo series, for example, includes Unison preamps that emulate classic hardware, which can be a creative tool. High‑end interfaces like the RME Babyface Pro FS offer exceptionally low noise and very stable drivers, but they cost significantly more. For most home recordists, the preamps in a well‑reviewed – interface are more than adequate. The biggest difference you’ll hear is in the quality of your microphone and your recording environment, not the preamp brand.

USB vs. Thunderbolt: which connection should I choose?

USB is by far the most common and compatible connection type for audio interfaces. USB 2.0 is sufficient for up to around 18–24 channels of audio at 48 kHz, which covers the vast majority of home studio needs. USB 3.0 and USB‑C offer more bandwidth and are backward‑compatible, but few interfaces actually require that speed for normal operation. Thunderbolt offers lower latency and higher channel counts, but it’s mostly found on pro‑level interfaces from brands like Universal Audio (Apollo) and Focusrite (Clarett+ Thunderbolt). If you’re a professional mixing engineer tracking live drums with 16+ channels while running many plugins in real time, Thunderbolt can make a difference. For a solo vocalist or podcaster, USB is perfectly fine and often cheaper. Most modern USB interfaces (especially USB‑C) provide round‑trip latency under 10 ms at a 64‑sample buffer, which is low enough for real‑time monitoring and playing virtual instruments. Don’t feel pressured to buy Thunderbolt unless you absolutely need the extra headroom.

What is latency and why should I care about driver quality?

Latency is the delay between when you play a note or speak into a mic and when you hear it in your headphones through your DAW. High latency makes recording feel sluggish and can throw off timing, especially when playing along to a track. Good drivers reduce that delay and keep the connection stable. Manufacturer‑provided drivers vary. Focusrite’s drivers are generally reliable on both Windows and Mac, with low latency performance. RME is legendary for its rock‑solid drivers with consistently low latency even under heavy CPU loads. On the other hand, some budget interfaces may use generic Microsoft drivers or have buggy control panels, leading to pops, clicks, or higher latency. When reading reviews, look for comments about driver stability and ease of setup. A well‑supported interface from a major brand usually means fewer headaches. Mac users often have fewer driver issues because Core Audio handles many interfaces natively, but Windows users should pay extra attention to driver reputation.

Which extra features actually matter for recording?

Built‑in DSP effects, like reverb or compression, let you monitor with effects while recording with zero latency. This is helpful if you want vocalists to hear a little reverb as they sing. Interfaces such as the Universal Audio Volt series offer a simple vintage‑mode circuit and bundled plugins that run on the computer, while the Apollo series uses real‑time DSP in the hardware. Direct monitoring (the ability to hear your input signal mixed with playback without going through the computer) is standard on nearly every interface. Some, like the Focusrite Scarlett, offer a blend knob that gives you full control over the mix. Others use a dedicated software mixer, which can be more flexible but also more complex. Pad switches, high‑pass filters, and instrument input jacks are handy but not essential. A pad switch reduces input level for loud sources, making it easier to avoid clipping on a snare drum or loud guitar cab. A high‑pass filter cuts low‑end rumble from a vocal track. Many budget interfaces omit these, but they’re common on models from Audient and Focusrite in the sub‑ range.

Frequently asked questions