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Phase cancellation explained

Earlier in the blog you mentioned “phase cancellation” as one of the reasons why bassline may sound flabby and not punch enough. Could you explain that please?

Ivan

Let’s take a simple audio sample. I’m going to use a kick drum from some sample library. Just a regular kick, nothing fancy:

Now I’m going to duplicate the channel, add Utility tool to reverse the poles of the phase, and flatten this channel into a new piece of audio. Here is what’ve got:

Two audio samples with inverted phase

Take a closer look at the waveforms: their peaks go in the opposite way. And now listen to what happens when I’ll playback both of these samples at the same time:

No, your speakers are fine. The result of these two samples playing together is silence — no sound, literally. This is what called a phase cancellation.

Typically, in the real production, your sounds’ phases won’t be exactly the opposite causing silence like in the example above, but even a subtle miss-phase will cancel some frequencies out. You should keep it in mind especially when dealing with a low-frequency signal such as bassline.

Watch also this excerpt from Lynda course. It demonstrates phase cancellation of an acoustic signal but the principle applies pretty much in every production:

 582   2017   Advice   Music production

Since 2015, I’ve run an advice section giving my experience and answering readers’ questions on music production, DJing, performing, marketing, management, and other aspects of the music industry. The purpose of the series is to spread knowledge and cultivate professionalism in the music industry. The advice series works simply: you send me your questions, and I answer them with a blog post when I have something relevant to say. Send me your questions via the form.

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