Problem with this amp

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Hi there

An externally hosted image should be here but it was not working when we last tested it.

300 Watt MOSFET Real HI-FI Power Amplifier
I built this 250 amplifier before( about a year ago) and I'm using it as my Subwoofer's amp
I build a new one today but it has a problem
when the input is low the output does not have any sound but when I increase the level of input sound, the output begins to amplify the input sounds but not quite good and it doesn't have any quality and it only amplify the parts of the input sound that has high level (like the bass of the music)

can anybody help me please??????
 
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