Physics: driving metal by a shaker tends to be highly resonant, like a tuning fork. unless carefully equalized (DSP), multiple signals (frequencies) can be hard to distinguish for unequalized shakers, mixing properties to generate single signals may be better than mixing multiple Outputs generated...
Aura Pro Bass Shaker The 2 Aura Pro Bass shakers, each with up to 30 lbs. per ft. of force, easily mount to any hard surface and transfer low frequency energy through whatever they are attached to. With 2 transducers you have plenty of flexibility for different mounting configurations. ...