The Electro-Voice SX200 and SX300 series of stage monitor speakers has been a familiar sight at live music performances since the late 1970s. Electro-Voice created the SX series of loudspeakers to be weather-resistant and capable of delivering full and robust sound at loud listening levels, which makes it ideal for outdoor performances. Electro-Voice phased out the SX200 series in the early 2000s and replaced it with the SX300 line. Except for some minor upgrades in the crossover circuitry, though, the cone and driver used, the design and the specifications are virtually the same. The modular design of the SX300 makes it relatively easy to disassemble to repair or replace internal components.
Use the Phillips screwdriver to loosen and remove the four screws that secure the grill to the front baffle. Remove the grill and set it aside.
Use a #2 hex driver to remove the eight screws that hold the woofer driver in place. Pull out the woofer a few inches until you are able to reach the wiring on the rear of the driver with the needle-nose pliers. Use the pliers to remove the wiring terminal leads from the driver.
Turn the speaker so that you can view the backside of the enclosure. Remove the 14 retaining screws that secure the front baffle piece to the rear enclosure. Use the awl or flathead screwdriver to pry away the front baffle cover from the enclosure. As you pry the front baffle piece from the rear enclosure, remove the baffle just enough to allow access to the wiring that goes to the tweeter driver.
Use the needle-nose pliers to remove the wiring terminal clamps from the tweeter driver. Set the baffle facedown on a flat surface.
Remove the two #2 hex screws that secure the tweeter driver to the front baffle. Remove the tweeter and set it aside.
Place the rear enclosure on a flat surface with the open area facing up. Remove the wiring clamp leading from the crossover circuit board XLR cable connector on the rear face of the enclosure with the needle-nose pliers. Use the Phillips screwdriver to remove the four screws that secure the circuit board to the enclosure. Remove the circuit board from the enclosure.
Turn the enclosure so that you can view the rear of the speaker. Remove the two screws that secure the XLR cable connector to the enclosure. Pull the XLR connector out slightly and then remove the wiring terminals with the needle-nose pliers.
Clean or replace components or drivers as needed. Reassemble the EV SX300 by reversing the steps used to take the speaker apart.