You could have blown a driver - it happens no matter how good the speakers are. I've had my towers for almost 10 years and a tweeter blew in year 3. The other drivers, no problems whatsoever. It just happens.
Axiom can hook you up with a replacement and tell you how to test it to be sure it is dead. Call or email them. Others will likely jump in soon to tell you how to test it. But your method seems good enough, but you will want to make sure the plugs did not come undone inside the cabinet before you order a new driver.
Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
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