i say go for it man. try and test everything. a true audioholic would tinker with and test new ideas for as long as they are alive. don't let anyone tell you no.. i don't see why anyone on these forums would say no. replace the magnets, if you find the speakers sound worse, replace something else. if it still sounds worse (but maybe a bit better than before), replace another part. before you know it you'll have your own speaker you designed. you can't go on theory/scientifics alone, you need to do constant hands-on work and testing even if your ideas sound completely ridiculous.