"On the 26th of March 2001, Evergreen Technologies introduces the new RumbleFX™ Force Feedback Headphones. So what is the big idea about this so call force feedback headphones ? Well, this particular headphone is able to "rumble" because of the utilization of a Digital Signal Processor (DSP) to capture low frequency signals converted by transducers located in the earpiece."
FULL STORY @ DESIGN (http://maa.design-tec.net/chardwarez/reviews/sound/rumblefxheadphones/index.shtml)
