Schematic DIY KitEQ Active, Passive, with tubes, transistors or op amps
For some high-end enthusiasts, although they are absolutely useless accessories, but hardly an amplifier does not need it: the sound system. There is everything from simple to complicated Kuhschwanzentzerrer parametric equalizer. Here are some links to various projects

Here you will find Schematic Circuit Diagram for DIY and further information on EQ
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