So, I'm looking at building a subwoofer, and I have spent a lot of time doing research and figuring things out, but I can't really get a good idea of EQ Level does. For example, the Amp Module that I want to get is this 1000 rms watt module http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-809 and it has a EQ Level going from -14.5 db to +6 db. I think that it is a volume control, but I want to make sure I know everything before I buy it. So is it a volume control, and if it is, How much of a volume variation will I see if in these different levels if I have a 1000 rms watt driver? Thanks!