There has always been a bit of confusion about this so hopefully this will help. This is direct from John at EA. "VL-210 were made with woofers that had 67oz, 80oz and 105oz magnets. Your unit (VL-210B) has the 80oz magnets. There is a 1.5dB increase as you go up each step in magnet weight." So it seems to play out like this: VL-210 (Original) - 67oz VL-210B (B in serial#) - 80oz magnets VL-210C (C in serial#) - 105 oz magnets Any VL-210 can be upgraded to B or C version as woofer replacements are available. As are mids and tweeters.