Bartolini NTBTG with active EMGs

With EMGs being active and having the preamp built into the pickup, there may be issues. I would check with EMG as they are generally pretty good about answering e-mails. Forget trying Bartolini. Their online customers service is a joke.

 

according to the bartolini website here , the ntbtg preamp runs at 9v only. As to whether you'd fry it at 18v, I don't know.
There's no reason why you can't use emg's with an additional preamp, I did this with EMG's and a U-Retro in my warwick thumb. There should be no problem with a bart preamp, although with only 9v you probably won't have as much headroom as you would at 18v.

Also, you don't say whether this is an upgrade install or new bass install. If it's an upgrade, and you currently have passive pups you should look into replacing your current vol/blend pots with pots of a more appropriate impedance for active pups (100k vs 250/500K). EMG usually supply these with their pickup sets.