Amp 'A' speaker out put broke ????

Amp ‘A’ speaker out put broke ???

so my speaker was buzzing, I come to the conclusion that its my A speaker output because I changed the speaker wire, speakers still the buz but the wires and speaker work perfect on the B out put. Does this mean the amp is done for ? I only just got them on Christmas and only started djing on christmass so I aint really got a clue about all the issues

It can’t be a groundloop?

I used my aux lead amp to my phone,when all the mixer and stuff wasnt even set up

I connected my phone to my amp via aux lead my mixer and stuff wasnt set up with it

Input selector on the amp? That’s what’s troubling my amp!

yes but only one of speaker outputs side ‘b’ is fine

surely some one can tell me if the amps completely broke or not ???