I have a pair of rf-3's and 2 of the woofers got small pits when I moved them into my new apartment. There is a small pit in 1 woofer from each speaker tower. I don't think the pit really affects the sound, but it sure makes my speakers look junky....is it possible to buy a new pair of woofers and if so how much do they cost? Also, are the rf-3 II woofers any different or was the internal wiring the only difference?