where can I purchase some replacement speakers???

[rtzstudios]

My father recently gave me some Cerwin-Vega "home theater" type speakers that are about 30 years old. The speakers basically crumbled to the touch (only touched them because they were already blown.) The tweets seem to be fine but the woofers need to be replaced. So were can I buy new woofers? They don't have to be Cerwin-vega's, but I would like a high quality brand. I am using them to A/B with my monitors (NS-10's just don't have that BASS.)