Slow, sluggish cloudy sound.....I usually do it after 20 to 50 hours. BTW MC are the only cartridge you can demagnetize. You will permanently damage MM or MI cartridge if you use a demagnetizer on them.
Using the demag doesn't demag the magnet, but does demag the pole pieces and other stuff around the magnet that does become magnetized over time. Never demag a moving magnet cartridge, only moving coils, and even with that, some manufacturers recommend avoiding this process. Benz, and many others do recommend demag.
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