Graphic Equalizer: In order to match the tonal quality of the center, surround L/R, surround back L/R, and presence L/R speakers with that of the front L/R speakers, the receiver has a graphic equalizer. You can adjust 7 frequency bands: 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, and 16 kHz. The gain can be adjusted between -6 and +6 dB What does this mean? Is this the same as my TeAC 10 band equalizer that I had years ago for my system of the past? In other words, does this adjust treble and bass? If so, should all the settings be the same for all speakers? Example, If I have the Center set at +1.5 should all others be the same? What settings should bring the best sound quality? Thanks. This is the first quality receiver that I have owned..