Various compensations have been developed to counteract excess midrange response in the instrument , including the use of amplifiers with a built - in smiley face curve and amplifiers that offer a handful of graphic equalizer filters .
The user can make the necessary adjustments when appropriate .
Various compensations have been developed to counteract excess midrange response in the instrument , including the use of amplifiers with a built - in smiley face curve and amplifiers that offer a handful of graphic equalizer filters so that the user can make the necessary adjustments when appropriate .