I have a blown driver and I'm not sure what to do

Check with Madisound (https://www.madisoundspeakerstore.com/ under the Madisound Services tab) to see if it might be repairable.

I'm sure that this has occurred to you but, if they didn't get blown at the same time (and possibly even if they did), you need to find out what's causing it! :)

Scott, pink or white noise might do the trick but a better test would be a set of frequency sweep tones.  Unhook the speaker that you think is ok and play the set of tones that should be covered by the driver in question (be careful of the volume).  A truly blown driver should be obvious.  I don't have a source for the tones right now as I'm at work but I'm sure others will chime in with a link.  Dick

Scott, a search for "download test tones" will turn up a bunch of sites.  http://www.testsounds.com/ is just one of many.  I'd start with a tone that is close to the middle of the range handled by the affected driver and see if I got any output.  Dick