Is there a perfect speaker?

Nothing is perfect. So neither are speakers.

Practically, the sound coming from a speaker might be said to be "perfect" when the listener thoroughly enjoys what they hear without reservations. After, all the speakers job is to deliver pure musical enjoyment. Knock on wood, that is what I find these days listening to to my OHM 5s. Pure musical enjoyment! Nothing to detract from the pure musical enjoyment. So I gotta say I feel that they do their job perfectly. I have 4 other pair of speakers set up to run concurrently in my home. I enjoy them all, but I can easily find some reservations in some cases listening to the others.

It doesn't matter really matter if in fact speakers are or are not perfect (they are not), if even there was a way to determine such things reliably and without debate.

No speaker is perfect. I was reminded of that recently when I went on an all out blitz to find the best speaker available. All did some outstanding things, but none did everything in a perfect state of synergy. That's why I'm still listening to my Dunlavy speakers which are the closest things I've found to a balanced presentation of sound, albeit in a small 'sweet seat' area.

Monogamous nirvana is an oxymoron, like jumbo shrimp, army intelligence and happily married.
No, there are no perfect speakers, nor is any other audio gear perfect. Stop listening for equipment flaws, and start listening to the music.

Lol, Jmc.
I was wondering the same thing about speakers myself. It just came to light with myself that certain speakers do certain things well, and other things not sk well. I wonder what the best way to switch your sound is then if you don't have analog? Get a nice tube amp to switch out with a ss? I don't particularly like thd idea of having a spare room full of speakers to switch out and set-up, besides, I think spare speakers leads to "spare amps and spare pre amps" more than a spare tube amp leads to spare speakers.

Yes, there IS a perfect speaker. But you should never connect it to anything, lest you ruin it.