Shaker

What is the difference between a vibrator 500 and Shaker 1000?
I just bought a 08 'Ford Shelby and has a sound system 500 shaker sounds impressive, but some others are Shaker Shelby 1000 …. making better or different?
Is the difference in power "(both score well above that more than likely put out about half of its advertised power), if you were to upgrade to a cheap "real" system 500watts that blew them both away from a factory installed system that sounds very good though
Ying Yang Twins – Salt Shaker