SinusLivee SL-A3000 hard sound

My SL-A3000 has a loud sound. Some sounds are amplified too much so for example soft blues get some loud sounds (
)
I have a pioneer prs-d1200m which plays this music without loud sound.
Perhaps the impact on the bass string gives very low frequencies with high signal strength
I also wondered "about the red jumper wire from U3 to U2 and resistors between pins of U2. Are these from factory" as mentioned in an earlier thread.
Have made a schematis, hope it's reasonably ok
Best regards
Michael
 

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