這是Nordstrand pu的一位Stew先生的回答，很清楚，也很有趣！ 比起一大串說明清楚多了...想買J series的可以參考看看！尤其愛琴是Fender Jazz的大大.... NJ5 = single coil pickups for 5 string J-basses but NOT for Fender 5. Great tone but sometimes there is noise. NJ5S = hum canceling version of NJ5. Not for Fender. No noise. NJ5F = single coil (like NJ5) for Fender 5 string Jazz. Great tone but sometimes there can be noise. NJ5FS = hum canceling version of NJ5F. For Fender 5 string Jazz. no noise.