I'm due to get a Yamaha BB3000 Very soon and i will like to give it an active sound. What is the best option? I have played the Yamaha plenty of times and i love the passive sound but i would like to have the best of both worlds. Can anyone tell me what outboard pre-amp would work best (If that is the way i should go) Sadowsky? J-Retro etc. Which one would give me an awesome Slap bass sound and nice deep sound.