hi, i have a a pair of wharfedale diamond 8.3's and a matching wharfedale diamond center. when i do a basic test sound on my yamaha rx-v450, the 8.3's sound different to the center (the center is slightly 'higher pitched' --thats the right word to describe it i think), even though they are part of the same speaker family. all isnt totally lost though, on the rx-v450 there is an option called CENTER-GEQ, which basically is a built in 5-band graphic equaliser to adjust the tonal quality of the center to match the fronts. however this is where i get totally lost, there are 5 freq bands (100Hz, 300Hz, 1kHz, 3kHz, 10kHz) which are adjustable rom -6 to +6 dB. im hoping this can make my center sound more balanced but i have no idea what or how to make the center less high pitched. some help or rough guide how to adjust the graphic eq mentioned above would be appreciated. thanks.