I don't want to sound silly, especially since I've been playing bass for a good eight or more years now, but I've never tried using a preamp or a power amp! I've definitely read up on them, but I want to hear first hand what the benefits are! My current bass setup is an Ampeg full-stack. Ampeg B2RE head with an Ampeg Classic SVT-810e. If I were to add an Ampeg SVP-Pro preamp to it, what can I expect? What if I upgrade the head to the SVT-4 PRO (which I intend on doing some day)? What if instead of the preamp, I added the Ampeg AP-3550 power amp? Which one would give me the most difference? The most power? Can they be used together?