Portable Audio Recorders, Explained

Genuinely useful, and it is the main reason to buy a current recorder over an older one at the same price. The file holds so much headroom that clipping stops being possible in practice, so you press record without setting a gain knob and adjust the level in your editor afterwards with nothing lost. That matters most for material you only get one shot at: interviews that suddenly get loud, live events, and any time you are recording while also doing something else. What it does not do is make a noisy preamp quiet or rescue bad microphone placement. Treat it as insurance against the most common mistake, not as a substitute for a good input stage.

You need them if there is any chance you will use a microphone other than the ones built into the recorder. XLR with switchable phantom power is what lets you plug in a shotgun mic for video, a studio condenser for voiceover, a pair of small condensers for music, or a wireless lavalier receiver. Without XLR you are limited to the built-in capsules plus whatever runs off a 3.5mm jack on plug-in power, which rules out most serious microphones. Two XLR inputs cover the large majority of real use; four is only worth paying for if you regularly record three or more people or instruments at once.

Because it sets a limit on how quiet a thing you are allowed to record. On a loud source every recorder sounds acceptable, since the signal swamps whatever hiss the electronics add. On a quiet source you have to raise the gain, and raising the gain raises the recorder's own noise along with the signal. A recorder with a noisy input stage gives you a fine recording of a band and an unusable one of a soft-spoken interviewee or distant birdsong. When you compare models, listen to owner recordings of quiet material rather than loud material, because loud material hides the difference completely.

On current models the built-ins are much better than most people expect, and built-in microphone quality varies far more between recorders than track count does. The directional XY pairs on current units get used for finished work, not just as reference tracks, and they handle loud sources without breaking up. External microphones still win when you need to get close to one source in a noisy place, when you need a specific polar pattern, or when the recorder has to sit somewhere the microphone cannot. Start with the built-ins and buy an external microphone when you hit a problem they cannot solve.

For a voice memo, yes. For anything you plan to edit or publish, no. Phone microphones are tiny, tuned for speech intelligibility rather than accuracy, badly positioned for anything except talking straight at the handset, and they sit behind automatic gain control you cannot switch off, which pumps the level up and down as the source changes. Phones also have no 32-bit float safety net, no XLR inputs, and they are busy doing other things that can interrupt a recording. Even an inexpensive current dedicated recorder produces audibly cleaner and more controllable stereo files.

Two if you only ever record stereo with the built-in microphones. Four is the practical sweet spot, because it lets the built-in stereo pair and two external microphones run at once, which covers a two-person interview with lavaliers plus a room capture, or a shotgun mic on a boom plus ambience. Eight tracks exists for roundtable podcasts and multi-microphone music sessions. Track count is the spec most likely to tempt you into overbuying, since it is cheap to print and expensive to carry.