This is very true. If you are interested in learning about Nd magnets, have a read of my May 2012 article for Front of House(FOH) a professional audio trade magazine. Its on page 32 of the following link:

http://digitaleditiononline.com/publication/?i=110979

Apologies for not being able to provide a direct link, it is one of those "virtual issue" magazine sites.

Neodymium-based magnets are very important for the solenoid motor structures used in many types of loudspeakers.