Audio Interfaces & Preamps

Interface reviews almost always lead with converter quality. That is the wrong order of importance for someone with a home studio and a low-output dynamic microphone, because every interface sold in the last decade has converters good enough that you will not hear their limits. What you will hear, immediately and unmistakably, is a preamp that runs out of gain.

So this hub ranks on published maximum microphone gain first. The spread is enormous: 55 dB on a Universal Audio Volt 2 against 69 dB on a Focusrite Scarlett 2i2. That 14 dB is the difference between an SM7B that sounds finished and one that hisses, and it costs nothing extra to choose correctly at the outset. How much clean gain do you need has the full table.

The second number is EIN — equivalent input noise, published in dBu or dB(A), and the more negative the quieter. It tells you how much hiss the preamp itself contributes at a given setting. An interface with 58 dB of gain and -129 dB(A) EIN can be quieter in practice than one with 64 dB and a noisier circuit. Gain gets you to the level; EIN decides what arrives with it.

Everything else is features, and features are genuinely worth paying for when you need them: a second headphone output changes what is possible with a co-host, MIDI saves a separate box, and four mic preamps with four headphone feeds is a different category of purchase entirely. What is not worth paying for is onboard processing you cannot undo. If a box prints compression into the recording, you have made a decision you cannot revisit in the edit.

If you are not yet sure you need one of these at all, do I need an audio interface answers that honestly, including the cases where the answer is no.