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One of the most useful and overlooked equalization parameters is the high pass filter. This can clean up the sound and decrease any low-frequency noise. Here is how to set it up. High pass filter can be another parameter on an equalizer, or it can be a stand-alone, plug-in, or device. The high pass filter does just what it says. It allows high-frequencies to pass and cuts off low-frequencies. Low-frequencies of many instruments sometimes just clash with each other, and in the end don't have much of the sound anyway. That's why if you roll-off the low frequencies below 100 hertz in most instruments, the mix begins to cleanup almost magically.
That doesn't necessarily apply to the kick and bass though. Usually, there is not much that's useful under 40 hertz for anything but the bass and drums and by adding a high pass filter it's surprising how it will clean up the sound. For instance, by rolling off the low frequencies of a vocal mic, you can eliminate the rumble of trucks and machinery that you can't physically hear because they are so low, yet they can muddy up a mix. The high pass filter can be found on mic preamps, consoles, and even on the mics themselves.
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