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Re:Iron Nitride Permanent Magnets – An Alternative to Rare E... by bsder on Saturday May 20, 2017 @12:59AM (#14381126)
Maybe ferrite, but you can also get ceramic magnets:

Ceramic 4.4lbs 50W http://celestion.com/product/20/rocket_50/

Neodymium 3.7lbs 60W http://celestion.com/product/14/g12_century_vintage/

And, yes, you will find that the values are all over the map in terms of weight. There are some much less powerful speakers that are quite a bit heavier.

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