_:nab44c44eaca9403c9211e435b358acb9xb0
<http://schema.org/description>
"The circuit below is a circuit to filter out low tone subwoofer . Subwoofer filter using IC op-amp TL072 to enhancing bass amplifier. Audio..."
<https://www.elcircuit.com/2016/03/tl072-subwoofer-filter-circuit.html?showComment=1503016945125>