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Original Message
Common
Posted by djk on July 5, 2017 at 15:02:19:
It's common.
Back in the day (30 years of hi-fi) I used a 100Khz oscilloscope (ignorance was bliss).
For audio I generally use just a good electrolytic between 22µF~47µF and leave it at that.
(I currently work in L-band RF and chooses bypass caps with great care and use a spectrum analyzer to monitor the results. Where the cap is grounded makes a huge difference, and series resistors on the order of 1Ω~10Ω added as well)