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An Introduction to Compression: Basic Compression - A free download from Audio Masterclass

An Introduction to Equalization - A free download from Audio Masterclass

Equipping Your Home Recording Studio - A free download from Audio Masterclass

Visualizing stereo information using Lissajous figures

Do some microphones respond to EQ better than others?

The importance of managing configurations and preferences in professional work

Does inverting the phase of one channel of a stereo signal always sound bad?

What is production? Part 3: Recording

What is production? Part 4: Mixing

Audio problems at the BBC - TV drama audiences can't understand what the actors are saying

Is your audio interface fast enough?

What is production? Part 5: Mastering

How to double track easily and efficiently


Description and application of the high-pass filter in the channels of the mixing console.

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A filter is the simplest form of EQ section possessing only the parameters of cut-off frequency and slope.

The cut-off frequency is the frequency at which the response has already dropped by -3 dB.

The slope is the rate at which the level drops above the cut-off frequency, measured in dB/octave. It is easy to design filters with slopes of 6, 12, 18 and 24 dB/octave.

  • A low-pass filter allows low frequencies through and reduces the level of high frequencies.
  • A high-pass reduces the level of low frequencies.
  • A band-pass filter reduces the level of low and high frequencies.
  • A notch filter filters out a narrow band of frequencies.
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By David Mellor Saturday May 24, 2003
Learn music production