Subwoofer Home Theater Amplifier circuit is designed for subwoofer speaker system that used on Subwoofer Home Theater system.Using IC as a based filtering subwoofer signal input and as a buffer it's power amplifier
Two Way Active Crossover
Subwoofer Active Crossover with LM741 IC , for Low Pass Filter circuit. Bass enhancer for more perfomance audio sound quality.
Mic pre-amp circuit using ic 4558 is a series of mic amplifier based on ic 4558 and also could use other op-amp ic ie TL072 / TL082 / NE5532. And a transistor C945 as a buffer circuit and other components of resistors and capacitors. See circuit schematic of mic pre amplifier :