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LPF and HPF input

Fernando Cuzziol
Prodigy 210 points

I am designing an amplifier based on TPA in 3116 so 3 channels, 2 stereo L and R channels. 1 channel L + R mono. The stereo channels will make a cut frequency at 80Hz HPF fixed and mono, a filter LPF set at 80Hz.
These filters are made in the input and output audio?
What circuit or components to use as entries are BTL.