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Odd. This is what I see when I go to larsonsound.com.
Perhaps someeone else will have an idea of what you can do. You could try clearning your DNS cache.
I get a webpage that looks like this:
That's pretty much what I get, though mine has a few headers at the top. I did notice that the certificate had today's date on it, though. Perhaps it was renewed shortly after the OP tried to get on the site. It would be quite a coincidence, but anything's possible.