This is the 300th most frequent Danish word.
larsen
"Larsen" is a Danish surname and does not have a specific meaning beyond being a family name derived from "Lars' son."
Here, 'Larsen' is used as a proper noun, likely the surname of a person referred to, used as a subject in the sentence.
Larsen spiller guitar i bandet.
Larsen plays guitar in the band.
In this case, 'Larsen' represents a brand or company name, referring to the maker of the speakers mentioned.
De læste om højttalerne fra Larsen i kataloget.
They read about the speakers from Larsen in the catalog.
'Larsen' here is used as a general family name, denoting a person with that surname but not specifying their first name or exact identity.