I just checked the car and noticed the driver's side speaker is almost silent while the passenger side sounds normal. I haven't changed anything recently, it just started happening. Could it be a loose cable or something more serious with the installation?
Did you check if the balance volume is turned toward the right side on the radio? Before thinking about loose cables or damage, check that first because it's the most common issue. If the balance is centered, then it could be a loose cable in the speaker connection or the speaker's voice coil burned out, but start with the basics.
First thing is to check the power cable and signal connection on your left speaker - a lot of times oxidized or half-loose contact causes exactly this without you touching anything, especially if it's been raining or there's moisture in the car. If the cables are properly connected, it's probably the speaker itself dying, so you'd have to pull it out and listen to it with an external source to test it.
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