this cap has blown due to something, remove it, and recheck all supply lines
a 0.1 uf in parallel of a big cap is to kill fast noises and small transients, because the big one will be slow to react, not acting like a tvs etc ....
thats the 2nd thing you do
the 1st : is as much as you can give us some model / brand / type / and pictures etc ... you're not helping the community by giving as little than a thread title and nothing else, even if you hear sound differences
you could or may have problems in a preamp section, eq section, loudness section etc ... the list goes on and on
you amplifier stage may be defective, dc at the speaker terminal etc ...
the schematic shown, is the speaker protector ic ... if it see some dc component at some level it will open the speaker relays
to me its a no go thread, because i dont have a crystal ball to guess your circuit
and pls do refrain to put comments in bold, it could be seen a some yelling (normally capital letters are defined as yelling)
you want serious help, pls do it accordingly by helping us for a start
it was asked in a previous thread BTW
thks