Hello All! I just bought a Yamaha 5 string bass(my first 5'er). I found it at an antique market. It didn't have any strings or a nut, but it does have a set of EMG active jazz pickups. I got a nut and cleaned the bass up and strung it up. The B string sounds very low in volume. The other strings have good output. Could it be possible that someone stuck a 4 string set of EMGS in this thing? I also have an old set of EMG jazz pickups kicking around and I noticed they are the same length as the ones in this 5 string. Are the EMG jazz pickups compatible for both 4 & 5 string?. Is there a way to tell if these are 4 string by model#.? My spare set have the SJ5 and LJ5 label on the bottom. I didn't remove the ones from the bass to check, so I'll do so and have a look. Just wondering why the output is so low on the B.