Shipping large speakers to Canada from US

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.

You should not have a problem. The buyer on the other hand will have to probably pay taxes (GST 7% & PST 8% depending on the Province)on the US amount converted into Canadian dollars. No duty as the product was manufactured in Canada.

RGD,
Are the taxes to be paid at time of entry into Canada, or do I just take some kind of tax form to the buyer?

Sharri:
My best bet on this, if you are delivering yourself, is that you will have to pay the GST and PST taxes at the border. Get a receipt and recover the cost from you buyer. Do advise your buyer ahead of time of this possibility, however. Other than this, there should be no major problem at all.
Good luck
Jeff