The question about where the speakers were made is the most important one. If they were made in England you will be paying import duty in addition to any shipping and brokerage fees. If they had been made in Canada there would be no duty because Canada is one of the members of NAFTA.
I bought a pair of Proac speakers, made in England, from a seller in British Columbia and drove them across the border to Seattle. At the U.S. customs office at the border I had to spend an hour waiting for a customs officer to go through thousands of product listings in a book that looked like the Manhattan phone directory. She eventually gave up and asked me what I’d paid for the speakers ($1,400) and she assigned a duty of something like $200, which was totally arbitrary, of course. So, there’s a certain amount of uncertainty in the process.
I'm not sure how you would accomplish it but getting an answer in advance from U.S. customs could avoid an unpleasant surprise.
I bought a pair of Proac speakers, made in England, from a seller in British Columbia and drove them across the border to Seattle. At the U.S. customs office at the border I had to spend an hour waiting for a customs officer to go through thousands of product listings in a book that looked like the Manhattan phone directory. She eventually gave up and asked me what I’d paid for the speakers ($1,400) and she assigned a duty of something like $200, which was totally arbitrary, of course. So, there’s a certain amount of uncertainty in the process.
I'm not sure how you would accomplish it but getting an answer in advance from U.S. customs could avoid an unpleasant surprise.