Based on my own experience sending Canadian products back into Canada, there should be no issues at all. If you ship the speakers, you will have to provide a customs declaration, but on the declaration write clearly that the speakers were made in Canada (Canadian customs will know the various speaker manufacturers in Canada).
If you decide to personally deliver the speakers, then take your original purchase invoice or bill-of-sale with you and show it to the Canadian customs officials. There is no problem with re-importing a Canadian product into Canada.
If you decide to personally deliver the speakers, then take your original purchase invoice or bill-of-sale with you and show it to the Canadian customs officials. There is no problem with re-importing a Canadian product into Canada.