Not enough power in the amplifier is what causes your speakers to blow.. not the speakers thenselves...when you over tax an amp by playing it too loud for the power it has available.. it goes into clipping which is a type of distortion; clipping is what blows your speakers out..you need a higher power amp and new speakers...if you don't want to blow them out again. Alpine Pionner are good brands to get...
you want to buy after market speakers such as infinity or clarion, those are more of a high end aftermarket speaker that work very well over other brands.