B&W 802D

Interestingly I have just purchased a used pair of B&W 802D speakers to replace my N801 speakers. Playing them at very high SPL (greater than 100 dB), with a Krell TAS amp, has not caused any issues. I believe they are a very robust speaker, maybe there is an issue with you amp? How many woofers have you blown?

I have B&W 803 N.   First generation. Not diamonds I purchased in 2002 new
i have been using them with Krell 450 MCX mono blocks.  And to my surprise no problems.   I mostly listen to med levels but plenty of loud sessions
17 years of same set up and still the speakers sound good for what they  are and do

R

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