lol, yup, ever seen this;
Breaking Glass with Sound
the one i first seen used a feedback loop so that it was self tuning, and used less energy.
GOING OFF TOPIC a bit, anyone seen the new sound cannons big bro uses, i was watching Weaponology on tv, apparently it uses ultrasonics to project, the actual sound is demoded on the target from the force cause by the ultraS, causing the sound to be CREATED on the target!,,, ITS funny cause several yrs ago, the guy at work was telling me I should invent a "ventriloquism machine", I told him all we needed to do was use similar to a radio encoder, to enc the voice into a RF that is high enough to travel linearly, and then demoded with the resonance of the object, mind you idk about ultrasonics, or any details, and I am not claiming rights,, but they stole my idea again!!! just like the guy who stole my idea of using TEA lasers to catch lightning(mind you he stole it 10yrs before i though it up),
......my next idea they are going to steal is:
the diamond capacitor <---- ultra high power(V), in a ultra small package!
BAK; this all reminds me of the first day I wired a singen + 2n3055 + 12v + coil of wire around tube with magnet inside!
that was the first time I have understood Q!, so what was he saying, about that driver should have higher +ve edge? also I wonder about the force he needs to initalize the ball, can you really use a seed to move a rock, as long as we overcome friction?
it still leaves my question about the driver, how do we make sure(establish) a sub-woofer can go to lowF, or a tweeters range, this question applies to all transmission mediums in the EM spectrum, incl, antennas and such????
PS: i just noticed those MIT vids are free online courses; any chance they have free exams & free diploma too!!?