Product Description The specially constructed two-way rock speaker systems for the Terra-FormsĀ® speakers utilize weather resistant components for years of trouble free performance. The polypropylene woofer and stamped aluminum tweeter are acoustically matched to give you clear vibrant sound with good bass characteristics. Terrasic StonesĀ® are natural looking and add beauty to any garden or back yard surrounding in which they are placed. They are available in Canyon, Slate, and White Granite finishes. Perfect for background music or public address. SP70VTA 25V/70V/100V external transformer available separately. Commercial applications include almost every theme park, Zoo, amusement center, leisure area, civic center, hotel chain and golf course.