If anyone is interested in reading about what Parametric Equalisation is and how it works, JL Audio have a *.pdf info sheet on the subject that is quite good. You can find it here: http://www.jlaudio.com/amps/pdfs/Parametric_Equalizer.pdf

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)