The Best 4-Channel Audio Interfaces

A 4-channel audio interface is the sweet spot for home studios that have outgrown a 2-in unit: you can record a vocalist and guitarist together, mic a drum kit’s essentials, or run synths and outboard gear without constant repatching. Below are the criteria that actually matter, then our research-based picks of well-known, category-appropriate units.

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These recommendations are based on editorial research and the established reputation of each product, not on fabricated lab tests.

What “4 channels” actually means

Be careful with marketing names. A “4-channel” interface usually means four inputs you can record simultaneously, but the mix of input types varies. Some have four combo mic/line inputs; others have two mic preamps plus two line inputs, or rely on ADAT expansion to reach higher counts. Confirm how many microphone preamps you get, since that is the limiting factor when tracking multiple mics at once.

How to choose a 4-channel audio interface

• Number of mic preamps: If you want to record four mics at once (drums, a duo, a podcast panel), you need four preamps, not two preamps plus two line inputs.
• Connection type: USB-C is standard and plenty fast for four channels. Thunderbolt appears on higher-end units for very low round-trip latency.
• Headphone outputs: Two independent headphone outs help when tracking two performers who need different monitor mixes.
• MIDI and monitor outputs: Useful for hardware synths and for proper studio monitor connection.
• Expandability: An ADAT optical input lets you add eight more inputs later via a preamp expander.
• Drivers and latency: Stable, low-latency drivers matter when you are monitoring live. See what is audio latency.

If you are still deciding whether an interface or a mixer fits your workflow, read audio interface vs mixer.

The best 4-channel audio interfaces

Focusrite Scarlett 4i4

A natural step up from the hugely popular 2i2. The Scarlett 4i4 pairs two clean Scarlett mic preamps with additional line I/O, MIDI and a balanced monitor output. It is a strong all-rounder for a singer-songwriter who occasionally records two sources at once and wants room to grow. Note it has two mic preamps, so simultaneous four-mic tracking is not its purpose.

PreSonus Studio 68c

This one delivers four XMAX mic preamps, MIDI, and ADAT input for expansion, plus a bundle including Studio One. It is a good value choice when you genuinely need four microphone inputs at the same time and want an upgrade path.

Universal Audio Volt 476

A four-input unit with UA’s Vintage preamp mode and a built-in 76-style compressor across the channels. Choose it if you want analogue character and onboard dynamics control while tracking a small ensemble.

MOTU M4

The M4 is well-regarded for clean conversion and an informative LCD meter, with two mic/line/instrument combo inputs plus additional line I/O and MIDI. It is a smart pick for producers who value monitoring accuracy and low latency.

Audient iD14 / EVO 8

Audient’s interfaces are praised for the quality of their console-style mic preamps. The iD14 and the more affordable EVO 8 give you a refined preamp sound in a compact 4-I/O package, with the EVO offering automatic gain setting that is handy for beginners.

Which one should you get?

• Need four real mic inputs at once: PreSonus Studio 68c or Volt 476.
• Singer-songwriter wanting a clean all-rounder: Scarlett 4i4 or MOTU M4.
• Prioritise preamp character and quality: Audient iD14 / EVO 8 (or Volt 476 for built-in colour).

Whatever you pick, set it up properly with how to set up an audio interface, mind your gain staging, and browse more options in the audio interfaces hub.

Frequently asked questions

Does a 4-channel interface always have four mic preamps?

No. Many 4-in interfaces combine two mic preamps with two line inputs. If you must record four microphones simultaneously, confirm the unit has four dedicated mic preamps before buying.

Is USB fast enough for four channels, or do I need Thunderbolt?

USB-C is more than fast enough for four channels in a home studio. Thunderbolt mainly buys you lower round-trip latency, which matters for heavy live monitoring but is not essential for most tracking.

Can I expand a 4-channel interface to record more inputs later?

Yes, if it has an ADAT optical input. You can connect an 8-channel preamp expander to add more inputs, which is why ADAT is a useful feature to look for when buying.