I'm designing an L-Pad for my speakers. They attenuate the signal while keeping a consistent effective impedance, which is necessary for the amplifier and crossover circuits.
Typically, these values are computed and hard soldered, giving one 'set' attenuation level.
I want to use a single potentiometer (though it could be a dual-wiper pot) to make this adjustable, and include 0 dB (completely out of the circuit).
Would this be possible to design, without the use of a microcontroller and programmable potentiometers?
It needs to maintain a constant impedance, and I'm using them on 8 Ohm speakers.
Solving for my application:
R2 = Variable from (infinity) Ohms / disconnected
R1 = 8 - (R2 * 8) / (R2 + 8)