In this segment of the Ableton Live 12 music production class, J. Anthony Allen explains why the built‑in audio hardware of computers and phones is limited to low‑quality sound and why a dedicated audio interface is often necessary for higher‑quality recording. He describes the physical differences between standard analog microphones (XLR with three pins) and computer inputs, showing that typical computers lack analog mic inputs. He then outlines how an external audio interface provides multiple microphone inputs, performs analog‑to‑digital conversion, and connects to a computer via USB or USB‑C. Allen also discusses USB microphones, noting that while they embed a small converter within the mic and can be a cheap alternative, their conversion quality is generally lower than that of a dedicated interface, though some models perform well. The segment concludes by setting up the question of when a dedicated interface is truly needed.
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So there is an audio interface built into your computer already. If it makes sound that you can hear, there's one in there. Your phone has one in it because it produces sounds that you can hear. But the one in there is a little tiny microchip, and it's not the highest quality. If we want to do something with higher quality, we need a dedicated box that looks like this. This is an audio interface. Okay? More on that in a second. Now, there's another reason we might want to have a dedicated box, and that's so that we can plug things into it. For example, here is a microphone, okay? This is a standard microphone. The output of it looks like that. It's got three pins, okay? Now look at your computer. Look all over your computer. Do you have an input that has three pins like that? You don't. You don't have an analog microphone input on your computer. No matter what kind of computer you're using, I guarantee you don't have one. So we take a box like this. It has a whole bunch of inputs for a microphone, and then it has an output to go into a computer. Usb. Usb, C. Whatever, right? So this can do the conversion for us. We can plug in a whole bunch of microphones, and it can do the conversion and send that digital signal to the computer. Okay? So that's why we need one of these boxes. Now, there are USB microphones that exist where it's a microphone and then it goes. It has a USB output, and then you can plug that directly into a computer. Those exist, and I used to make fun of them and say that they're garbage. But I've listened and played around with a few of them in the last couple years, and some of them are actually really good. I'm not going to lie. Some of them are good. What that means, though, is that they have the converter built into the microphone. Okay. Which means it's a tiny little converter. It's not going to be that great. But again, I've heard some really good ones. So if you want to do that, that's okay. That is a cheap way around buying an audio interface. So that's what an audio interface is. Now, let's talk about if you need one or not.
