Acer 90.00012.30B Computer Speakers "turn volume aspire" Questions

turn it off i did this: right click the speaker icon at the bottom right. click 'sounds', then 'playback'. double click 'realtek speakers'. click 'levels', then at the bottom there is a slider saying

...aspire 4en5 laptop; first, the external speaker plug didn't want to stay in the green jack hole. got that fixed, now sound only comes out of the 2 small speakers, but not the subwoofer! also, got ...