d-fend.com
D-fend Loudspeaker Protection TechnologyD-fend Loudspeaker Protection Technology. The industry’s first all-digital, programmable loudspeaker protection and attenuation circuit. D-fend is designed to solve the age-old problems associated with protecting passive loudspeakers from excessive power conditions. A patent-pending technology, D-fend allows maximum driver performance while ensuring damage-free operation. What can be better than offering a bullet-proof loudspeaker system? Own some passive speakers? Chances are you've come closer than you...
http://www.d-fend.com/