magnet types
IF I get a new driver, it will likely have a different type of magnet, newer types are lighter, as I said, mine are 5-1/4 lb alnico, I got this AI response
"Neodymium Magnets are the strongest and most efficient, offering high magnetic strength in a compact, lightweight design. Ideal for high-end, portable, and professional audio systems, they enable superior sound clarity, better transient response, and higher sensitivity. However, they are more expensive and sensitive to heat and corrosion.
Ferrite Magnets (also called ceramic magnets) are the most widely used due to their low cost, durability, and excellent heat resistance. They are heavier and bulkier than neodymium but perform well in larger speakers like home theater systems, car audio, and subwoofers. They are corrosion-resistant and stable under high temperatures.
Alnico Magnets are an older alloy type (aluminum, nickel, cobalt) known for producing a warm, natural, and musical tone. Commonly used in vintage-style guitar speakers and premium studio monitors, they offer excellent tonal quality and consistent performance across temperatures but are more expensive and less powerful than neodymium for the same size. "