EDIT*** I CHECKED ALL THE SPEAKER WIRING ALREADY, NOTHING WRONG PLEASE HELP ME ***

yesterday i fixed my problems with the engine noises coming from the speakers. and now today for some reason my front left speaker is weak. what i mean is , my [ Front Right , Rear Right , Rear Left ] plays at a "normal" rate. but my Front Left Speaker plays at a smaller rate. Is my Radio Broken? or is the front left speaker just broken? Is there anyway that i can fix the problem? if there is, can anyone help please im 17 and its my first car well thanks to anyone that can help

 

to see if the speaker is messed up hook the speaker up to another channel (ex: the wiring for the front right speaker [after disconnecting the front right] and see how it plays)