Rockustics - ROCKY III - 2-Way Outdoor Rock Speaker Designed to mimic the look of granite boulders, the Rocky III is a 2-way speaker with a 6.5" woofer and 0.75" tweeter. An optional 64W transformer is available for using the Rocky III in 70V systems. This item is only available in limited quantities in Brown and Grey. Sandstone color is no longer available.