Yes, excellent advice from George. What I would suggest that you do first, though, assuming the speakers are in your possession, is to do some basic troubleshooting with a multimeter. If you don’t already have one, the cost of a decent multimeter would be fairly minimal, and it may prove to be useful for other purposes in the future.
What I would do first is to measure the resistance between the + and - terminals of each speaker, with the speaker disconnected from the amp. Under normal circumstances I would expect to see a resistance of something like 2 or 3 ohms or so, given the speaker’s nominal impedance of 4 ohms. If the reading is an open circuit (i.e. an extremely high or infinite resistance), then remove the woofer as George suggested, but before disconnecting it prop it up on something and measure the resistance across its terminals. Again, I would expect to see no more than a few ohms. If you again see an open circuit it would be indicative of a blown driver, probably due to exposure to excessive DC as George stated.
And, while the driver is removed, to whatever extent may be possible examine the interior of the speaker using a flashlight, looking for wires that may have come loose, or anything else that looks amiss.
Good luck. Regards,
-- Al
