Implementing the RBJ Filters I came across this very nice little bit of HTML5 from Aike showing the magnitude response of the LPF and HPF. If I'd seen this before I wouldn't have pasted in so many images from the excel sheet and instead put some live HTML5 graphs like this in instead.
I've modified the original to put the Bandpass and Notch responses in as well. You can see below (and play!). When I get a chance I'll put the paramters values in too as this would be a neat little design tool.
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