a. Start with a minimum volume level and increase slowly till you get to a comfortable. DO NOT start at a maximum.
b. If there is a uncomfortable whining sound or distortion, immediately reduce the Volume level.
A simplistic explanation of sounds around you is that speech tends to predominantly lie within 500Hz-4000Hz, while Noise and other unwanted sounds lie beyond this frequency region. Therefore using the Equalizer, suppress sounds above 4000 Hz and also sounds less than 500 Hz as shown in the figure below. Try to maintain a bell-shaped curve in the equalizer (The peak points of each frequency band form a curve).