What would your "perfect speaker" sound like.

What would your perfect speaker sound like. Not interested in the brand, or the a speaker you heard at a friends house or audio show This is a thought experiment. Simply conjur up the most divine sound in you mind and tell us what you are conjuring. 

Please be brief, 


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.