HELP with Vandersteen 2ci speakers


Need help with a set of Vandersteeen 2ci speakers. The issue I have is that to my ears I have to turn the voulme dial on my preamp to at least 9:30 or 10:00 to get any real volume out of them? Im not looking to blast them but I do like a nice amount of volume. I have to turn the volume to at least 7:00 to get anything above a very low whisper. I know they are somewhat hard to drive but im powering them with a set of Electron Kinetics Eagle 400 mono blocks which are putting out 350 watts each? Mono blocks have been serviced and tested and are up to snuff. Any help is greatly apreciated.

Thanks
artez
still don't getit weather there's or there's no problem in the system. is there mute switch on preamp??
Thanks for all the responses. I am currently running a Pioneer Elite c-72 preamp. I know not the greatest but its what i got and to be honest it does sound darn good to me! At the 11:00 and 12:00 positions the speakers sound fine actually they seem to open up around this level and sound very smooth and laid back. The lowest setting on the volume dial is around 6:30 7:00
If it sounds good to YOU it means that component is GOOD no matter what brand/model it is. Technically it has sufficient gain from your provided info. In my case I have almost the same situation. Normally I listen at 9:30...10 and crank it to 12...13:00 when I want it loud.
Have you done the tiltback as in the manual with both
speakers equilly the same with a laser and bubble level?
no I haven't done the tilt back with the speakers. How do I adjust them to lean back?