Hard Audio - Ceramic Speakers

AFAIK, damping the FR damps the ringing as well. Something about this is how minimum-phase devices work.

It’s not intuitive. We believe that a passive or active EQ would affect the frequency but not time domain, but I’ve read otherwise.

In rooms, the same principle works, with some help from bass traps. 

Best,

E

In theory, with everything equal and no other speaker distortion mechanisms then Dr Toole may be correct: pure ringing at the fundamental can be removed with a notch filter it. However, in practice speakers are not perfectly linear and have limited operating range and other forms of distortion - so the speakers won’t sound the same -  so in practice it is far better to have a speaker with a flat response to begin with then to compensate using electronics. 

The kind of ringing that is of most concern is that from wobbling modes from energy within the cone diaphragm itself. This sounds splashy or dirty and is not necessarily harmonically related to the music.

I also want to point out that many, many drivers have break up modes / ringing in the top end of their usable range. Dealing with this is not all that difficult or new. 

How it is dealt with in crossover design depends a great deal on the next component up the frequency spectrum. Low pass filters may put the ringig 20-30dB or more down in response making a specific notch filter irrelevant. All the fans of the Focal inverted domes have ultrasonic ringing which they don't seem to complain about very much either. :) 

And sometimes we deal with the resonance by designing speakers not to be toed in. :) 

Best,

E

Kharma Grande Ceramique loudspeakers uses a 7 inch ceramic midrange and in my opinion still among the best. I have had them for a decade and they still blow me away

@likecap 

Interesting they are made with Focal Tweeters, and another, non-ceramic woofer. :) 

I wonder if they add color? :) 

Best,

E