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Romy,

I have seen this a few times with JBL and Altec drivers. This phenomena occurs more often in Alnico magnets than any other type of magnet. When a magnet is recharged, it is blasted with a very strong magnetic field. There is really no way to “half-way” charge a magnet. The magnet just accepts as much charge it can, and the rest of the magnetic energy delivered to the magnet during the charging process is wasted. If a manufacturer needed more flux, then they added more magnet weight. I had Orange County Speaker recharge a JBL 2482 for me once. They told me that the flux had dropped down to 14.7 T. They cleaned up the driver and recharged it. Once recharged, they said they measured 19.3 T in the gap. I checked the flux myself with a gauss meter from my work and it read 19.4 T. After about 6 months of use in a local Bar, I re-measured it and the flux had settled down to 17.2 T. The JBL specification for the 2482 is 1.7 T, so it is pretty close. Others have told me that when Alnico gets recharged it measures high, but decays very quickly down to a more normal charge level. I would not be surprised to see your 2.1 T S2 driver drop down to 1.6 – 1.7 T very quickly once you begin to use it.

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