No problem running the Clarks, they take 100 Watts. Note that they are full range (up to 17 KHz). If you only want bass Aura makes a bass shaker that goes up to 200 Hz for about 1/3 the price.

Bass shakers have always seemed like a cool idea but I've never pulled the trigger. Not certain how'd they blend with the rest of the system. I'd be interested to hear how yours turn out.