Whenever you add or cut via trebble or bass controls you are taking a chance of adding noise to the signal..
'Working' the sound with potentiometers has always been viewed as a last resort by all the sound engineers (studios and concert sound reinforcement) I have know.. I was always taught to do everything I could to avoid turning those knobs ! The more you crank'm over, the more dirt you are throwing into the mix..
Which brings up an interesting question, are the Trebble Mid Bass pots today digital ? Now that would be a horse of a different color..


LFE ! The rest is just details..