is a 555:1 impedance ratio ok?

i'm not sure if this posted correctly before, so forgive me if this is a double.

does the output impedance of the EQ box change if i switch between two different preamps with different output impedances?

i think i need clarification on the relationships between input/output impedances when components are connected in chains.

The answer to your question is no. The output impedance of the EQ box is independent of the pre-amp feeding it. Or it should be.

Drubin is right. The active circuitry in the EQ isolates the input impedance from the output impedance.