B&W 802D

If from an LP, you need to invoke a subsonic filter.
Otherwise, use a multimeter, and measure the DC output. Should be nearly zero.

I have blown 3 woofers, in different channels, with different amps.  Originally was driving 802D's with a Krell, 125W/channel.  Upgraded to the ML's to try and solve this problem.  No luck.

I had B&W 802D's, and they were some of the most reliable speakers I ever owned.

Can we get a precise description of what happened?  Blown woofer isn’t enough information.  
First, what happened sonically, and under what listening conditions?
Was the failure a melted voice coil, torn surround, damaged cone, etc? 
I wouldn’t think it possible to destroy woofers in that speaker during any normal usage.