Do you think you may have blown anything? Or do you think it is a characteristic that you're just starting to notice? Have you tried isolating it any further, like by removing frequency bands with EQ or by disconnecting and removing or replacing things?

I asked because most audio content in movies are processed and synthesised more than the meat you find in baloney. In some movies, the audio track is completed stripped from the footage and recreated in computers. And you know what happens when you have poor content and revealing speakers...

But from the sounds of it, the problem is consistent across all movies. I'd probably check your connections and soldering inside the speakers. A month ago, I had a poor connection with the horn tweeter. Low frequency pressure from the woofer caused the connection to vibrate which in turn introduced a buzz in the HF.

Gar.

Its been there all along and I just now noticed.

Its time to build another speaker is all.

Over and out.