What would your "perfect speaker" sound like.

Natural… not accentuated in treble or bass. Coherent top to bottom… I have owned a number of planar / dynamic speakers… while listening to them they don’t sound uncoherent… until you hear a coherent one. I would rather some bass truncation over incoherence with split technologies or subs with different character.

Musical with natural timbre. After over ten years with season tickets to the symphony in “the audiophile seats, row 7 center”… I know what natural and musical sounds like.

It has to sound like live music.   Beautiful tone.   Wide dynamic range and ability to scale.  Elastic quality , fluid.    Is that asking  too much?  

There is no such thing as a perfect speaker at ANY price bracket. When you have a few different speaker designs and realize their pros and cons, you would get a feel for 'perfection'  constrained by the limitations of an engineering design space (that any engineer is subject to).

Instead of looking for a perfect speaker, focus on building a perfect room. The latter is much more achievable than a perfect speaker.

Natural, balanced, and they disappear into the performance.  Hope that’s brief enough. 

Like no speaker at all