Speakers with "sub woofer" (Brig O' Turk FK17)

I've used them as pc speakers for a while and they are fine, but I've upgraded. There is an optional "sub woofer" that adds a little bass. One speaker wire is a little iffy, but just needs set right and it's grand (could be perfect if wire resoldered). 3.5mm audio jack for input and usb for power.