The Monument Series BlockRock speaker is an on-ground, sealed omnidirectional outdoor speaker designed to stand out from its surroundings. Its two-way design includes an 8-inch coaxial woofer and a 0.75-inch dome tweeter, with an optional 64W transformer available for use in 70 volt systems. All Monument series speakers are constructed of a non-polluting stone and resin compound, designed to withstand rain, frost, snow, and ice.