Audio for filmmakers – Making a lav sound like a boom

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  • July 02, 2015

Before I answer the question of “How to make a lav sound like a boom,” I’m going to assume a couple of things.

  1. You’re not an audio post professional, but more of a video guy/gal (filmmaker)
  2. Since you’re here, you know a little bit about the EQ module in your software of choice

You’ve probably┬áseen the answers on audio forums, people saying things like “I EQ it to match.” or something similar, on how to solve the lav/boom problem. Now what the hell does that mean, specially to a person not an expert in EQ matching? It’s worse than greek to a filmmaker, or any person who’s primarily a video guy/gal, without the means to pay an audio post person.

Here’s what it means. The EQ signatures have to be similar. Typically, in my limited experience. The boom has more activity in the 4.5k-5.5k area. So what you need to do is:

  1. Take your lav audio and increase the DB around┬áthe 5K area, as in the picture below. (I’m using Izotope Nectar below, but you can use whatever you like. Adobe Audition is a fine tool for EQ matching).
  2. In the lav audio increase the DB around the 16K area also, but not by as much as in the 5k area


Of course if you want to be precise, then what you need to do is the following:

  1. Play your boom audio and watch how the graph behaves
  2. Play your lav audio and watch how the graph differs from the boom audio. Chances are high, there will be less activity in the 5K region.
  3. Adjust the EQ with the EQ knobs, until the frequency signature is similar to that of the Boom audio.

That’s what EQ matching means. Hope that helped. If you’re still confused, leave a message and I’ll get back to you.


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