How can I determine if my speaker or amplifier is defective?

Check the cable connection between the amplifier and the speaker and use another cable if necessary. To test, swap the speaker cables at the amplifier or speakers, so the left speaker is connected to the right output and vice versa. Start playback. If the fault moves to the other side, the amplifier is defective. If the fault remains on the same side, the speaker is defective. For center speakers, use a front speaker for testing. Test another audio source, such as a CD player or mobile streaming, to ensure that the signal source is not the problem.