Of the dozens of bass amps out there, very few have the same frequency centers for their tone controls. Many of them are obviously designed for bass guitar. I would like to see a discussion on this subject, particularly from people who are very pleased with the eq section of their amps as regards to double bass. I guess this would also apply to external preamps as well. There are some amps/preamps that seem to be the go to for many, eg: Walter Woods, AI, Platinum Pro, GK etc, and it would be interesting to see where the similarities lie. I have the opportunity to have a double bass specific amp built to my own specs, and eq centers are a topic that seems to be lacking in available information.