Update: I installed a set of Aguilar AG 4J-60 pickups in my JB-2. I have mixed feelings regarding the tone of these pickups. These pickups do bring out more mids, but they also bring out low frequency fundamentals. Notes played on the E string lack definition and clarity. The rest of the strings sound good. I may check out a set of Nordstrand NJ4 pickups. I have a NP4 installed on my LB-100 and it sounds great. The quest for the perfect tone continues.
Final Update: Installed a set of Nordstrand NJ4SE a few months ago.
At first I liked the tone these pickups produced, but after a few weeks, my affair with these pickups ended.
Three sets of pickups and the bass's tone was dead. Original G&L single coil jazz pickups, Aguilar AG4J-60, and Nordstrand NJ4SE.
The tone was bass heavy, mid-scooped, and no highs whatsoever, even with new strings.
Finally, two weeks ago, I gutted out all the passive electronics and installed a set of EMG JAX pickups I had lying around and whoa.....the bass came alive.
The EMG pickups and pots evened out the tone of this bass.
The bass tone was tamer, and the mid and high frequencies were present.
I tried a couple of tone circuits:
EMG EXB: This produces an instant "active" tone at the twist of the knob. Great for slapping, but not much else. Removed.
EMG BTC: Provided separate bass and treble tone control. But, it was overkill. The bass did not need a preamp. Removed.
EMG Active Tone Control: Works fine.
I'm not 100% certain the stock passive pots or tone cap were the culprit to the bad tone of my JB-2, but after replacing all the electronics this bass is now a keeper.
PS: I tested the Aguilar and Nordstrand pickups in another Jazz Bass I have, and neither pickup produced the tone I was seeking.
Here is what I'm using:
Warmoth Jazz: Nordstrand NJ4.
G&L JB-2: EMG JAX.