Self powered speakers have quickly become a favourite of many. The amplifier is built right in so no more bulky amplifier racks and complicted hookups. Just send a signal to the input either from a cd machine, mp3 player, iPod or cellular phone, plug the speaker into the wall outlet and that's it, you're done. They provide an easy and portable solution to having great sound at a moment's notice. They are perfect for those back yard parties, bars or pool halls, public functions or bedrooms of crazy people. Be sure to check out a good powered subwoofer to use them alongside.