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You may have just prematurely broken in your speakers, as over time the woofers tend to become less stiff. Because it happens over time you generally might not notice the change. True damage you might expect from this event would have been a blown tweeter, and from your description that probably didn't happen. Give it a few days and see if you get used to the sound before doing anything rash.
You probably did NOT do any damage at all. This is an excerpt from B&Ws marketing literature (for your model):
"Which means excellent timing and control, no matter how loud you’re playing it."
The specs for the speakers indicate recommend amp power is " 30W - 300W into 8V on unclipped programme"
Your amp is rated at 25O Watt max into 8 ohm.
Unless you drove the amp into clipping there should be no damage. Extremely loud "normal music content" is fine. It might be worthwhile to run a frequency sweep through the speaker (at low volume mind you) to get a sense whether or not there is anything obviously wrong. Also, play some music you are already familiar with and volumes you are accustomed to and form an opinion.
Hope this helps.
Hi all, I really appreciate everyone's feedback. The good news is that the speakers seem to be in good shape. I have listened to the tweeters with my ear against it, as well as tried gently pushing in the woofers. No problems there.
As for the reduction in sound quality, specifically base, I think it might have to do with the new Cambridge Audio DAC that I had bought brand new. After about 20 hours of use, the sound is improving. I'll probably let it burn in for another 30-50 hours before deciding whether to keep it or return it.
Again, I really appreciate the advice.