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The small magnet version is probably a neodymium magnet, which may be equivalent to the larger ferrite magnet. I would not doubt the product of magnetic field and winding length (which gives the force per unit current) is the same. I don't know if the drivers are actually different, though. Why not get a better set of speakers, like the Morel Hybrid Ovation II, or the Focal IFBMW or 100KRS? There is also a new option from Rockford Fosgate for BMW (Don't' know if they're any good). Cost might be a factor, I suppose…
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