Can you give a model number or link for your Pioneer?
I know this might be a stretch, but is there any way for you to take a better/closer picture of the back panel on the Sub and upload it to the forum here. The ones in the link you gave give a general idea as to how it looks but I am unable to see exactly what is what on the knobs...
It still sounds like you are just having an issue with how the Pioneer is setup..
Did you get any kind of documentation as to what the responce range of the driver is?
[Edited by SP_Kenny on Jul 5, 2007 at 8:22 PM]