Hello. I have a Yamaha Receiver, and I trying to tweak it nicely. I have adjusted the levels as good as I could do, etc. I did notice they have a five band graphic equalizer. 100hz 30hz 1khz 3khz 10khz The default setting was all 0, and I have been testing with different settings, but is there a general setting for each? Something I should or shouldn't do? A specific one too high, low? Any help?