Folks, I've got a Pbass and an Ampeg B-50R. My bass has a standard, passive pickup. For awhile, I was playing a very high-end Washburn bass with active electronics (Bartolini pickups). That bass was hugely louder through this little amp. The sound seemed sort of processed, which is what's always made me steer clear of actives, but it was very clear and fat. I gave that bass to my son, though, and since then I've missed that big sound. My friend gave me a small "Silver Bullet" preamp stompbox (designed for guitar), and I bought a passive Bartolini P-bass pickup for my Pbass. These didn't produce the same sound at all. Now I'm wondering if some sort of preamp is what I'm looking for to get that big sound in a box I can switch in or out. I've seen such items from Roger Sadowski and from Aguilar, but haven't tried them. I assume these are really useful, high-quality things, but I'd like to know more about them. Does anybody have experience with small preamps before the bass amp? Thanks!