To determine the issue with the faulty speaker, it's essential to identify whether the problem lies in the woofer or the crossover. Here are a few steps to follow:
Swap the speakers: Start by swapping the positions of the two speakers to see if the problem persists or moves to the other speaker. If it moves to the other speaker, the issue could be with the cables or amplifier. If it persists, proceed to the next step.
Listen closely: Listen carefully to the faulty speaker and identify the nature of the problem.
Is it muffled or quieter than the other speaker? Is only a particular frequency or a range of sound affected more than others?
Inspect the woofer: If the issue is related to the bass frequencies, gently press the woofer with your finger to check it moves freely. If it feels stiff or doesn't move at all, the woofer may be damaged or not aligned correctly.
Inspect the crossover: If the issue relates to the mid or high frequencies, the crossover may be the problem. It directs different frequencies to the appropriate drivers, so inspect its connections for any looseness or damage.