$15,000 Speaker Does Not List Freq Response Specs

"I came across a speaker mfg that does not list the frequency response specs for their speaker."

They leave it out because some speaker designs just don't measure well. Panels and horns are a good example. They measure terrible.

You can't just listen around all that minor stuff?

"Zd542, I attended as a serious listener with intent to buy
and not just out of curiosity. I didn't hear enough to
convince me to pay the $15k price of admission."

I was joking. Show conditions are usually very bad and almost impossible to "listen around".