Is it possible for a high end manufacturer to overprice their goods?

Typically all out assaults at building the very best possible component of a category results in a product with an extreme price. It serves to show what the company is capable of and its value gets assessed mostly by professional reviewers. If favorably reviewed it builds the companies reputation and can cause folks to look at their lower priced models. Trickle down technology and techniques benefited the customers and company. It may not be the profit or volume of the highest price model that is important to the company. A few sales to well healed customers may be well worth it. look at Wilson, they have been selling speakers for over $500K for decades.

This also is not Rockport’s most expensive speaker. The Lyra is $190,000

Yes. It's definitely possible. A fool and his money are soon parted, and there is no denying corporate greed. Think about it... Product parts may equal three thousand dollars max. Product sells for a hundred and thirty three thousand dollars. That's a net profit of a hundred and thirty thousand dollars. Well over my annual income if they sell just one pair to somebody rich and wanting an elitest speaker.

No - free market so they can price things however they want to.

Whether they make enough profit or not is another question that depends on many factors other than price alone.

There will always be consumers who believe the more expensive something is, the better it is, or simply want the bragging rights to having paid the most for something.  And so long as there are people with more money than they can spend in 100 lifetimes (Elon and Jeff B. come to mind), there will be a small market for $500,000 speakers etc...  Are they worth it?  Doesn't matter.