I have just installed a Noll (Germany) TCM3 preamp with 3 band eq and active/passive pull switch in my Bacchus 5 string. It came prewired with quality solid-shaft pots and I gotta say "it's very cool". I previously had an Aguilar OBP3 in my Yamaha, which wasn't bad, but a bit overpowering really. The Noll is more subtle, where the Aguilar was smack you in the face. With eq points at 40hz, 400hz and 4khz, it compliments my Bacchus very nicely. Just posting this in case anyone is thinking about preamps and is unsure about the Noll. If you want a blaster, go Bartolini or Aguilar, if you want refined you will not be sorry going with a Noll. I got mine from BestBassGear, and I recommend them.