Question about the geofex parametric eq

[zencafe]

Thanks a lot RG and Mark for the answers, talking about my lack of attention in math classes , I didn't find the relation betwteen C1 and C3, and their respective band's frecuencies, since according to the formulas the frequency varies according the max and min L values and C2 (and C4 for the other band) besides I didn't find the same ratio between C1 and C2, and C3 and C4.
I know I'm missing something... but dunno what .
I'm asking this cause I'd like to build the same circuit, but change the frequencies to 200Hz - 900Hz, and 700Hz - 3.1kHz.

Thanks again!

D.