Jan 31, 2023 · I’ve searched far and wide for API 550A and 550A-1 schematics. 550A schematics are largely illegible and A-1 schematics are very hard to find. Here are links to legible versions of each as well as a schematic of the 3 transistor buffer used in the 550A:

Learn about the API 550a schematic, a classic equalizer used in professional audio recording and mixing. Explore its circuitry and functionality.

Created Date7/11/2007 12:10:02 PM

The api 550 series equalizer, with the exception of the 550A-1, has a family of boost cut curves that are referred to as "Proportional Q". Proportional Q describes a relationship between the energy that is added or removed by boost and cut and the range of frequencies (bandwidth) effected by differing degrees of equalization.

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API 550A EQ schematic I finally got ahold of a hardcopy 550A schematic. The one that is floating around the internet is pretty much unreadable. I scanned it at a higher resolution for you. 550a.pdf March 16th, 2009 | Category: Studio Tech | Comments are closed

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api 550A schem1.pdf - Free download as PDF File (.pdf) or read online for free.