I have a pair of Infinity Kappa 6s. On one of them the cream-colored plastic dome on the Polydome K midrange has become cracked and small pieces of it have fallen off. Is there any way to replace this plastic dome, and is it advisable or necessary to do this in order to preserve the quality of the speaker's sound? I know Orange county speaker sells replacements for the entire Polydome K midrange. They charge $129.95 for just one of them! I'd like to avoid that. If the absence of the plastic dome is just an aesthetic problem, I can live with that.