Title: Openai/6942bda8-3500-8009-863c-4337a422fc34 - freem URL Source: https://freemwiki.com/index.php?mobileaction=toggle_view_mobile&title=Openai%2F6942bda8-3500-8009-863c-4337a422fc34 Markdown Content: _This conversation was exported from ChatGPT_[[1]](https://freemwiki.com/index.php?mobileaction=toggle_view_mobile&title=Openai%2F6942bda8-3500-8009-863c-4337a422fc34#cite_note-1) ## gpt-5-2[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=1 "Edit section: gpt-5-2") ### User: what determines if BW stands for band width or butterworth in a EQ filter[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=2 "Edit section: User: what determines if BW stands for band width or butterworth in a EQ filter") what determines if BW stands for band width or butterworth in a EQ filter ### Assistant: In EQ filters, BW can legitimately mean two different things, and what it stands for is determined by context: the type…[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=3 "Edit section: Assistant: In EQ filters, BW can legitimately mean two different things, and what it stands for is determined by context: the type…") In EQ filters, BW can legitimately mean two different things, and what it stands for is determined by context: the type of filter being described and how the control behaves. #### 1. BW = Bandwidth[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=4 "Edit section: 1. BW = Bandwidth") Most common in parametric EQs ##### What it means[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=5 "Edit section: What it means") Bandwidth describes how wide the affected frequency range is around the center frequency. * Measured in octaves (e.g., 1.0 oct, 0.5 oct) * Inversely related to Q - Wide BW = low Q - Narrow BW = high Q ##### How you can tell it’s Bandwidth[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=6 "Edit section: How you can tell it’s Bandwidth") BW means Bandwidth when: * The EQ is a bell / peaking filter * You see controls like: - Freq / Gain / BW - or Freq / Gain / Q * Changing BW makes the curve wider or narrower symmetrically ##### Example[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=7 "Edit section: Example") BW = 1.0 octave The EQ affects frequencies one octave wide centered on the selected frequency. #### 2. BW = Butterworth[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=8 "Edit section: 2. BW = Butterworth") Common in crossovers, HPF/LPF, and system processing ##### What it means[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=9 "Edit section: What it means") Butterworth refers to a filter alignment / response shape, not width. Butterworth filters are: * Maximally flat in the passband * Smooth with no ripple * Have a predictable phase response * –3 dB at the cutoff frequency ##### How you can tell it’s Butterworth[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=10 "Edit section: How you can tell it’s Butterworth") BW means Butterworth when: * The filter type is HPF or LPF * You see options like: - BW, LR, BES, Cheby * The slope is specified: - 12 dB/oct BW - 24 dB/oct BW ##### Example[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=11 "Edit section: Example") 24 dB/oct BW This is a 4th-order Butterworth low-pass or high-pass filter. #### 3. How to tell which one it is (quick rule)[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=12 "Edit section: 3. How to tell which one it is (quick rule)") Ask these three questions: | Question | If YES → | | ------------------------------------ | --------------------------------------- | | Is it a bell/peaking EQ? | BW = Bandwidth | | Is it HPF / LPF / crossover? | BW = Butterworth | | Does it change width or slope/shape? | Width = Bandwidth / Shape = Butterworth | #### 4. Digital mixer reality (like Behringer WING)[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=13 "Edit section: 4. Digital mixer reality (like Behringer WING)") On mixers like the Behringer WING: * Channel PEQ - BW = Bandwidth (bell filters) * High-pass / Low-pass - Filter type is typically fixed (often Butterworth-style internally) - You usually don’t see “BW” labeled here unless choosing alignment So if you see BW next to a bell EQ, it is Bandwidth, not Butterworth. #### 5. One-sentence takeaway[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=14 "Edit section: 5. One-sentence takeaway") BW means Bandwidth when adjusting how wide an EQ bell is, and Butterworth when describing the response type of a high-pass or low-pass filter. If you want, I can: * Map this specifically to every EQ section on the WING * Show BW vs Q mathematically * Or provide training-course-ready wording for danatucker.com ## References[edit](https://freemwiki.com/index.php?title=Openai/6942bda8-3500-8009-863c-4337a422fc34&action=edit§ion=15 "Edit section: References") 1. [↑](https://freemwiki.com/index.php?mobileaction=toggle_view_mobile&title=Openai%2F6942bda8-3500-8009-863c-4337a422fc34#cite_ref-1 "Jump up")["BW meaning in EQ filters"](https://chatgpt.com/share/6942bda8-3500-8009-863c-4337a422fc34). ChatGPT. Retrieved 2025-12-17.