These the speakers? https
/www.cnet.com/products/cambridge-soundworks-classic-series-tower-ii-speaker-wired-series/specs/
3 way, tweeter, mid range and woofer
The speaker wire terminals at the back of the box, theres just red and black yea?
Unscrew the plate and have a look behind it. Check that speaker wires from inside the box are connected to it. That would be my thought why the woofers aren't working, maybe poor soldering it let go from vibrations. But funny how both speakers went and now the subs, perhaps theres nothing wrong with the driver's them selves or capacitors but wiring itself. Hopefully, just reattach job.