Sometimes, cleaning up the bottom end on your production can add punch. Adding a high pass filter (which actually cuts low frequencies) can make more room for music and sound design tracks that are providing impact. Applying cut below 75hz on a vo track will take care of rumble that eats up energy in a mix but won’t harm the fullness of the vo which usually exists around 120hz.
In mastering, cut at 30-40hz to clean up sub frequencies that hog room in your mix yet are not audible. For AM radio, you may need to cut more low end since the frequency range on AM is narrower than FM. Runaway low end can pin the meters while the listeners aren’t hearing anything. This sometimes happens when an FM producer is asked to contribute to an AM station for the first time.
If you have good analog meters in your studio, you’ll notice how excess bass kicks the meters into the red and a high pass filter pulls them back. Of course, if you use Brown Bag, you never have to worry about that stuff since we scrub all our music and sound squeaky clean before upload.
A caveat – if you use Waves eq, a low end roll off can result in an increase in output level from the plug. Compensate with output fader of the eq
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