I am working on a final project for my circuits class to design an audio amplifier. We are creating an equalizer circuit that has passive high pass, low pass, and band pass filters. Every where I search I find a design similar to this:
What is the purpose of the resisters outside of the filters? For example, the two 10k resisters on top, or 3.3k resisters in the middle. They aren't part of the filters, are they?