Is there a hard and fast rule how to have your Integrated Amplifier Hz and Khz switches set ? As an example, I have for "Treble" a 3Khz crossover position and a 6 Khz position on my Sansui AU-717. And for Bass,I have 400Hz and 200Hz Crossover positions. Do you use a certain combination for lower volume and then change the Crossover setting combinations for louder levels ? I mean I know you do,but is their a rule to follow based on your Volume Setting ? Does this matter especially since you can adjust your Bass and Treble using those control knobs also ?