Amplifier barely produces bass signals after a lightning

aca94sss

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Dec 23, 2010
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Hey guys! People who understand electronics should try to answer this, thanks. I've got 5.1 system hooked to a pc with AUX, Microlab A-6662.
After a lightning that struck close to my house, I've noticed that my amplifier barely giving bass signals to a subwoofer (subwoofer itself is totally ok).

Main question important for me is: What part inside of the amplifier that is making bass could be malfunctioning? So I could look for it with the instrument. Thank you !