High-pass filter 6dB per octave.
Shelf Filter - Audacity Manual
How to design Shelf and Butterworth HP or LP 6db/oct, 12db/oct filter? - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone
Filter slope - Apple Support
Q. Will a mic's high-pass filter counter the proximity effect?
What EQ Filter is Best For Mixing Bass and Low-End? – Mastering The Mix
Bode Plots
6dB Passive Crossovers
What Is a Highpass Filter? When Should I Use it?
Amazon | Doepfer マルチポールローパス/バンドパスフィルター A-108 6/12/24/48dB Low/Band Pass Filter ユーロラック モジュラー シンセサイザー | シンセサイザー | 楽器・音響機器
Linkwitz–Riley filter - Wikipedia
Project 170
What makes 6dB filters so special – Just Blogging
What makes 6dB filters so special – Just Blogging
Second Order Filters | Second Order Low Pass Filter
What makes 6dB filters so special – Just Blogging
High-Pass Filter - Audacity Manual
What makes 6dB filters so special – Just Blogging
Spectrum Analyzer Basics: Bandwidth
Why do the orders of hi/low pass filters go in 6 dB increments? - Sound Design Stack Exchange
Filter kernel equation for 6dB/oct linear phase low pass? - DSP and Plugin Development Forum - KVR Audio
Analog filters
Solved: 6 dB/octave highpass Butterworth problem - NI Community
Change db level in low pass filter to be less than 6db? - Windows - Audacity Forum
