Laoban Soundsystem via Michael!
Laoban Soundsystem is a 6,000-watt massive soundsystem fabricated in China. The plans to make it are 100% copyleft under a Creative Commons share-alike license. This copyleft hardware is called Qi Hardware (http://qi-hardware.com). Laoban is Qi Hardware. All steps needed to build the speakers are documented and the knowledge to reproduce the soundsystem is made available to anyone, particularly on the web at http://laoban-soundsystem.com.