Originally Posted By: Dr.House
I believe one way to test for a blown driver is by very carefully and gently pushing the cone and feel/hear for any "scratchiness" or "roughness". If you get any those characteristics you have a bad driver.

I would talk with axiom before doing anything like that however.


You're exactly right House. Here's a response I received from Alan on how to check my M80's for a blown driver:

"So, here's how you can check each of your M80s. Play some wide-range music
(or use a pink-noise test signal from your Denon) with lots of bass,
midrange and percussion, stand close to your speakers and check that each
driver is working and producing sound. If you are certain each is working
and you don't hear scratchy, nasty sounds from a driver--even mechanical
scraping sounds--then you can assume that all the drivers are fine.

Now, turn off your Denon and get down so you can gently push the cone in for
each of the woofers and midrange drivers--push them straight in gently with
equal pressure and listen for any scraping sounds. Don't push the cones too
far, just a bit and move them back and forth. Be sure you don't push on an
angle because the gap in the voice coil and magnet is really small and you
might inadvertently push the cone to one side or the other, causing it to
scrape the magnet. If all the drivers are fine, you will hear nothing when
you push the cones in and out.

If one of the voice coils is partly fused, then as you push it in or as the
cone springs out, you'll hear a scraping sound because the voice coil is
scraping on the magnet. Remove the offending driver and call our toll-free
number and we'll replace the defective driver. The speakers have a 5-year
warranty.

I suspect you didn't do any damage or you would have heard nasty scraping
sounds while you were playing music or a clicking or raspy sound when deep
bass is reproduced, or a staticy sound from the tweeters if a voice coil is
fused."

The only reasonable argument for owning a gun is to protect yourself from the police.