OK, so what I'm getting is the pickups are the same, but the preamp has been changed. So let me ask this? Right now my bass has EMG PJ pick-ups and a mike pope pre-amp, changing the pickups to (EMGX)and not the preamp will do nothing new for my sound other then having a x on the pickup cover. Do I have this right? Thank you all again for the help.
No, that's not right. There's a big difference between active
pickups and what is referred to as an active
bass.
EMG's active pickups - including your PJ set - have a small preamp inside the pickup. This accomplishes a few things that are different from standard non-active pickups. Not necessarily
better, but different.
It allows them to use much weaker magnets, which exert less magnetic pull on the strings. Generally allows more sustain than standard pickups, though maybe not real noticeable.
The pickups are very thoroughly shielded internally, making for a very quiet system that does not require a bridge/string ground; this in turn also eliminates the common shock hazard of touching your lips to a poorly grounded microphone and having it "find" grounding through your lips/face/hands/bass/amp. If you've ever experienced this, you will value it. A lot. There seem to be a lot of bar stages out there that were wired by a carpenter. This can be a painful experience at best, and under rare but possible circumstances it can make you very dead.
The internal preamp allows EMG to have an extra element for building the pickup's tone, beyond magnets/windings/bar material, etc.
The term active
bass usually refers to a bass that has a preamp that is separate from the pickups which incorporates active tone controls, allowing you to boost or cut specific range frequencies (bass, mid, treble) rather than only cutting treble as a passive tone control does.
EMG X pickups use an internal preamp with a different voicing, so an EMG PJX set will sound different from an EMG PJ set, even with the same external preamp (Like your Pope preamp).