At this point in the game. I consider those who make extravagant claims about either as trolls. Magnet properties are well documented.
But regarding 604's, I think GPA has a couple Alnico versions. I also suspect they are built to order. A phone call to GPA, not email, is your best shot. Don't be surprised if you have to pay and wait a couple weeks. At least if I were GPA's manager that would be policy. Loose parts can become whatever speakers they fit, but once put into speakers they wait till someone wants THAT speaker. Inventory is cash tied up.
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