If we accept Dr. Greenman's assertion that tone controls are represented by a transfer function, then then any mechanism altering tone is represents that transfer function, whether cable or amplifier. Note also that the room represents an entirely different, and far more complex transfer function. This is why equalization cannot fix acoustics - equalization can only affect the input of the system into the room. Acoustics is the output of the room into the ear. The transfer functions are separate. Changing a value in the frequency domain has no impact on the reverberant domain. The acoustic transfer function of the room remains constant unless physically changed by absobtion, reflection, or room geometry.