Powered Speakers, also known as Active Speakers are often, lightweight, versatile and portable and are ideal for front of house or foldback in corporate, live show or party applications. They are called "Active" as the speaker box contains an amplifier with an internally programmed signal limiter that powers and protects the speaker itself. With the increasing use of digital processing, these speakers are becoming more powerful in output and even lighter to carry around. Powered speakers are usually made from either hard plastic or wood, and range from subs with 10" thru to 18" drivers, and mid/high boxes from 8" to 15" with 1" to 3" horns.