High-end warmth and low-end clarity.
Sand-cast Alnico V magnets on the 3 low strings add more definition and punch to the bottom end. Sand-cast Alnico II magnets on the 3 high strings provide warm and smooth top end without sacrificing that great vintage quack. Some players find their low strings sound mushy and their high strings are too bright, especially in the bridge position. The Five-Two concept counteracts this phenomenon. If you look closely at the pickup, you can actually see the difference between the 2 magnet types. Reverse wound/reverse polarity for the middle position.