My internal microphone broke, and I have an external microphone on my webcam on an external monitor that is extremely quiet even when the volume is set to 100%.

I tried using Boom, Loopback, and SoundSource, all of them can amplify output (speaker) volumes to above 100% but not microphone volumes.

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Is there a way to boost the microphone's input volume above 100%?


I'm using it for Zoom meetings, so I need a software that modifies the volume in real-time.

  • 1
    SoundSource can't use plugins on the Input unfortunately. Did you check if your webcam has any kind of control panel available? [Some do, some don't]
    – Tetsujin
    Jul 8, 2020 at 18:35
  • 1
    You don't increase the volume of a microphone, you increase the gain. There's only so much gain your going to get out of software. If you want to override that, you must do with with hardware - and for that, you need a preamp/mixer
    – Allan
    Jul 8, 2020 at 21:02
  • 1
    Use a separate Mic then. What comes on your computer is more for "meeting a marketing requirement" than putting in quality gear for quality results. For instance, my iSight cam is "good enough" for the occasional video chat, but since everything has gone virtual I had to shell out for a high quality webcam (Logitech Brio 4K) and I still have an external mic for when higher quality is needed (i.e. streaming a presentation). You've unfortunately reached the limits of what the built in stuff can do.
    – Allan
    Jul 8, 2020 at 22:59
  • 1
    Putting in a quality mic with pre-amp isn't as expensive as you'd think. Maybe even start with a good quality USB Mic (Snowball Mic is a good one).
    – Allan
    Jul 8, 2020 at 23:02
  • 1
    I know, it sucks...and believe me, when Apple talks about "going green" it's not about the environment - it's about how to get you to give them more of it from your wallet.
    – Allan
    Jul 8, 2020 at 23:34

2 Answers 2


I'm a bit late to the party, but I had exactly the same issue. The answer was Audio Hijack (probably the one Rogue Amoeba product you didn't mention : )

There is a 'Built-In Effects' block called 'Volume' that allows you to alter the volume and it has 'Overdrive' options to increase the volume by up to four times. Seems to work well for my Aftershokz OpenComm headset that's too quiet for me even at 100%.

I hope this helps.


To increase the sound, import the sound file into an iMovie project. Once it is in, select the audio recording and drag the volume slider to anything beyond 100% (you can also click the sound button in the app and increase it from there).

Once you're done modifying the volume, share the iMovie project as an audio file.

  • 2
    Thanks, this is correct for people who want to record audio to a file. However, I'm using my audio for Zoom meetings, which requires software to change the volume in real-time. Sorry for the ambiguity. Jul 8, 2020 at 22:48
  • 1
    @Hykilpikonna No problem. I’ll just leave my answer for other future users. Jul 8, 2020 at 22:49

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