I bought a cheap computer Sub to repurpose it as a selfmade gaming vest. The circuit has 2 amplifiers on it, one for the normal unfiltered sound that goes to the 2 speakers, and then the output of this one is filtered and sent to a second amplifier for the subwoofer. The filtering is not great... I tried with a wave generator and got clear, loud sound up to 11.000 hz... I would like to add a low pass filter that has a cutoff frequency of 200Hz on the input of the second amplifier. I found a 1uF capacitor at home, and after googeling around i somehow came up that with that capacitor I would need a resistor of 820Ohm to have a cutoff frequency of roughly 195 Hz.
Is that correct? Wouldn't that resistor in series lower drastically the input volume to the amplifier?