Neodymium magnets are a pricey rare-earth metal that will hold an incredibly high magnetic "charge." Consequently they provide a significantly higher magnetic flux density in everyone's thoughts gap then can generate a lot greater action force inside the voicecoil. The electro-mechanical parameter is known as "Bl" or product from the magnetic intensity plus the amount of wire in the voicecoil.

Changing magnets on a speaker would change "Bl" and likely mess everything up. A speaker sounds good given it finds a symbiotic mix of The many various parameters that creates a balanced sound.

It is possible to make excellent sounding speakers from both Ferrite and Neodymium magnets. Even old-school Alnico magnets from WW2 era produced some beautiful sounding speakers that are still popular today and Alnico has even less "B" than Ferrite.

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