Anyone else having this issue with the Elac Debut B6?

Be careful with that stuff. The speaker's designer insists that it will not eliminate the resonance,
probably only move it's frequency to a more audible range.

 

I would play the piece and find which surface/surfaces are vibrating. See if you can reduce/eliminate it by applying pressure to the vibrating surface. If this works then a well placed brace or braces will reduce or eliminate it.

Will make the resonance frequently higher and out of the range of the woofer which is the culprit causing this.

Cost cutting in the cabinets resulted in this and placing in what cost cutting took out will give you a better sounding speaker.

 

I dont think NAD's 40Watts is an issue to be honest. But still its worth trying them out with another amp.
Am pretty curious to hear more about the issue
Did you try adding something heavy on top of them like someone suggested?

 

The OP has irritating audible buzzing. I guarantee that adding Dynamat will significantly reduce the resonance and its audible volume even if it does raise the frequency.

 

You could always find a nice pair of BS-21s/22s. I have a 5.1 setup with the original AJ Pioneers - no buzzing at all. Also have a pair of BS-21s that I drive with a Sansui AU-999 with the bass turned up. No buzzing. I don't understand how people suddenly forgot how great the AJ Pioneers are.

 

Yes, indeed!
-Bob

 

Just as an update, two factors have caused me to delay implementing any of the suggestions: 1) An issue with my back prevents me, for the time being, from carrying the NAD 375BEE down a flight of stairs to where the stereo is; and 2) A slight change in position of the speakers seems to have ameliorated the problem to some extent, enough that I'm able to enjoy listening to the speakers again. Long may that continue!