This preamplifier can be used with several of our amplifiers posted here. You can reuse burned-out home-theater speakers, with the option of using a subwoofer and two or more satellites.

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Details

English

https://xtronic.org/circuit/preamplifier-2-1-stereo-tone-control-subwoofer/

Portuguese

https://www.te1.com.br/2022/10/pre-amplificador-2-1-estereo-tons-subwoofer/