Greetings!

I've been designing DIY speakers for a while but recently I realized that the newer speakers are all cone-based except for the tweeter. What happened to the dome midrages? Almost no speaker manufactures uses dome mids anymore. Are they phased out because they are no good?

Also, I think Planar speakers are disappearing from the market except for Martin Logan. I see some DIY stores still sell planar (ribbon) transducers...etc, but none of the famous speaker manufactures uses these anymore. Is it also because they are no good?

Thanks!!