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, 


Assuming that big orchestra is one instrument, perfect speakers should sound very close to that instrument at any sound level. And if to accomplish that they have to be of enormous size, so be it.

I honestly don’t know, other than it would be so enjoyable to listen to that there’d be no way to make a speaker more enjoyable to listen to. That might involve some elements of extreme realism, and some elements of artful coloration.

Like live unamplified music. 

and it takes your whole audio system to achieve something close to live unamplified music, not just speakers.