![I did not understand the bandwidth and 3dB part of the lecture. What is a crossover point and why is it important? I did not understand the bandwidth and 3dB part of the lecture. What is a crossover point and why is it important?](https://www.cds.caltech.edu/~murray/courses/cds101/fa02/faq/021104corner.jpg)
I did not understand the bandwidth and 3dB part of the lecture. What is a crossover point and why is it important?
![Please tell me, Why the cutoff frequency is taken for 3dB and not other values like 1 or 2 db? | ResearchGate Please tell me, Why the cutoff frequency is taken for 3dB and not other values like 1 or 2 db? | ResearchGate](https://www.researchgate.net/profile/Peeyush-Garg/post/Please-tell-me-Why-the-cutoff-frequency-is-taken-for-3dB-and-not-other-values-like-1-or-2-db/attachment/59d6205cc49f478072e980c1/AS%3A271755719970816%401441803020689/download/Butterworth_response.svg.jpg)
Please tell me, Why the cutoff frequency is taken for 3dB and not other values like 1 or 2 db? | ResearchGate
![low pass - Cut-off frequency and -3dB frequency of Butterworth filter - Electrical Engineering Stack Exchange low pass - Cut-off frequency and -3dB frequency of Butterworth filter - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/unX6i.png)
low pass - Cut-off frequency and -3dB frequency of Butterworth filter - Electrical Engineering Stack Exchange
![Bandwidth calculating -3 dB cutoff frequencies -3 dB corner frequency - quality factor Q factor band pass filter center frequencyq factor formula 3 dB bandwidth in octaves vibration frequency EQ equalizer bandpass Bandwidth calculating -3 dB cutoff frequencies -3 dB corner frequency - quality factor Q factor band pass filter center frequencyq factor formula 3 dB bandwidth in octaves vibration frequency EQ equalizer bandpass](http://www.sengpielaudio.com/FilterBandwidth09B.gif)