DO NOT use a lousy old (designed 46 years ago) 741 opamp for audio. It has hiss, its high audio frequency response and slew rate are horrible and it produces distortion.
Audio power amplifiers can be class AB or class-D and have a specified input level. Your preamp output must produce that level. If the input level is too high then the output of the amplifier clips and produces square waves.
Impedance matching is almost NEVER done for a preamp output to a power amp input. The preamp output is a low impedance and the power amp input is a high impedance.
A 2.1 preamp has a very low frequency output to feed a sub-woofer power amp and two low, mid and high frequency outputs to feed the left and right power amps. The preamp might have the frequency crossover circuits or the power amps might have them.
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