SAMPLED

Mixing and mastering · updated 2026-08-16

Q AND FILTER SLOPE

Q sets how narrow an EQ band is; slope (dB per octave) sets how hard a high- or low-pass cuts past its corner frequency.

A Solid State Logic Matrix mixing console with channel strips, faders and pan pots — the desk layout behind the gain, EQ and balance terms in this section.
Mixing and mastering — A Solid State Logic Matrix mixing console with channel strips, faders and pan pots — the desk layout behind the gain, EQ and balance terms in this section.

Photo: Solid State Logic (SSL) Matrix Mixing Console at Audio Mix House, Studio C (opens in a new tab) by Audio Mix House (opens in a new tab), via Wikimedia Commons — CC BY 2.0 (opens in a new tab)

Key takeaways

  • Q sets how narrow an EQ band is; slope (dB per octave) sets how hard a high- or low-pass cuts past its corner frequency.
  • Filter slope, measured in dB per octave, sets how steeply a high-pass or low-pass rolls off past its corner frequency.
  • Use a narrow high-Q cut to remove a single resonant ring, and a wide low-Q shelf for tonal shaping.
  • Watch out: using narrow boosts for tone.
  • Sits under mixing and mastering in this glossary, with 2 primary sources below.

Quick checklist

  • Can you define q and filter slope in one sentence without looking?
  • Can you point at q and filter slope in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

Q AND FILTER SLOPE IN DEPTH

Q sets the width of an EQ bell — high Q is narrow and surgical, low Q is broad and musical. Filter slope, measured in dB per octave, sets how steeply a high-pass or low-pass rolls off past its corner frequency.

How it works in practice

Use a narrow high-Q cut to remove a single resonant ring, and a wide low-Q shelf for tonal shaping.

The mistake people make

Using narrow boosts for tone. Broad boosts sound natural; narrow boosts usually sound like a resonance you will want to remove later.

WHERE Q AND FILTER SLOPE SITS

Q and filter slope belongs to mixing and mastering in the Sampled music glossary. The processing vocabulary, plus the loudness standards streaming services actually measure you against.

TEST YOURSELF

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3 quick questions on q and filter slope. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes q and filter slope?

  2. 2. What is the mistake people most often make with q and filter slope?

  3. 3. In practice, which of these applies to q and filter slope?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for q and filter slope — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Stanford CCRMA — introduction to digital filters (opens in a new tab)

    University research centre · Stanford CCRMA

    “Q sets how narrow an EQ band is; slope (dB per octave) sets how hard a high- or low-pass cuts past its corner frequency.”— the claim this source supports

    Why it counts: The CCRMA course material derives this from first principles, so you can check the maths behind the plain-English version above.

  • AES standards (opens in a new tab)

    Professional standards body · Audio Engineering Society

    “Q sets the width of an EQ bell — high Q is narrow and surgical, low Q is broad and musical.”— the claim this source supports

    Why it counts: AES writes and reviews the engineering standards and peer-reviewed papers this terminology comes from.

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