Threshold s300 not working

I’m 15 and not too experienced in the world of home audio but probably know more than the average teenager. My dad and I have a threshold s300 in our basement powering a pair of kef 107 speakers. I say my dad and I because I tend to use more than him. It was when it was working the best sounding audio setup I’ve ever heard. I have two other car amps sound stream d200s that I believe were also designed my Mr. Pass anyways the amp and speakers never get abused
Never get cranked up or have any rap or any awful music like that played on them. I got a crown xti4002 for free and 4 Yamaha s215vs I worked in painting all summer that’s sounded awful compared to the threshold. The threshold and the kefs were sitting for a while when my father plugged it back in it worked great as it always did but later down the line it stopped I’m not sure what exactly happened it was me who it broke on but my dad turned it on and it wasn’t working I think the fuses were blown or something and he messed with them and got it to work but or maybe not I’m not entirely sure. but now all the fuses are good and what happens is the amp plays through the speaker but quietly and only through the tweeter. I put a different pre amp on it a nad 3020 and it did the same thing I switched the speakers I put a b&w bookshelf speaker on it and it still did the same thing it does it on both speakers. sorry for giving you my life story! but does anyone know what’s wrong?
 
Don't just replace the fuses, check them all electrically first. Do keep some spare fuses around though.
Make sure the fuses fit tightly in the fuse holders, they can get loose. And always unplug the amp first.
 
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