I already have a bass in the same series with the same pups and preamp and I don't like the tone on it particularly. I've done some reading up on it and most people agree the preamp isn't all that great. I'd just like to experiment around with my two basses and see what pups/preamps work best together if that makes sense? I'm not 100% sure which bass I'll be putting the EMGs/preamp in yet though as I haven't heard the new one yet. I guess there's nothing really wrong with the sound, it's just nothing special. Not to my ears anyway...
I got a reply from Aguilar pretty much straight away, this is what they said:
"Hello James,
Thank you for your interest in the OBP-3!
Our preamps are designed to work with any pickup – active OR passive.
The only pots you will have to change are the EQ pots that come with the OBP-3 – you can leave the volume and blend pots that are in the bass.
I hope this is helpful but please let me know if you have any further questions.
Kind regards,
--Marco"
Thanks for all the help guys, I've learnt a lot from all this!