Audio speakers are simple in design and function, making them relatively simple to fix.
Unfasten the driver (speaker) by removing screws around the perimeter.
Speakers for a home stereo or entire home entertainment system amplify the sound generated from another component of the system. The typical speaker is a collection of complementary parts. Most enclosures (speaker case) have a 6- to 15-inch-diameter cone woofer for low frequencies, a 3- to 6-inch-diameter dome or cone midrange driver (commonly called a speaker), and a small tweeter for high frequencies. Audio signals move along speaker cables to a terminal block at the back of the enclosure. Once inside, a crossover network divides incoming frequencies into the appropriate ranges, sending each to the correct driver. Drivers then convert this input into mechanical movement of the cone which, in turn, moves the air in a way that is detected by your ears as sound.
Disassemble a speaker unit:
Unplug the speaker cable. If the speaker is a powered unit, unplug it from the electrical receptacle (outlet).
Remove the speaker enclosure's front grille to access the drivers and the crossover network. Grilles are secured with snaps, Velcro, or screws.
Unfasten the drivers, as needed. Drivers on a bass reflex speaker are screwed in from the front. Some speakers are sealed in position and may require a sharp knife to break the seal. If so, replace the seal with sealer from an electronics store when the repair is finished.
Lift the driver from the enclosure to gain access to the wire connectors that attach the terminal block to the driver. Use pliers to carefully remove the wires from the rear of the driver or the terminal block, or both locations. Note that some internal wires are soldered rather than clipped.
Remove the crossover network, as needed. Most are accessed from the front of the unit, though some are inside and are accessed once the main driver is removed.
Find the unit's fuse and test it with a multimeter.
Use the multimeter to test resistance and continuity on the driver(s), crossover network, and/or the terminal block as needed. Most drivers will have their resistance indicated on the back side, such as 8 ohms.