A system for indicating a medium jam along a medium transport path comprising: (a) one or more rollers for use in conveying a medium along the medium transport path; (b) at least one microphone for detecting the sound of the medium being transported and producing a signal representing the sound; (c) a processor configured to produce sound values from the sound signal and further configured to: (i) compute pre-transport path maximum values responsive to the sound values from the at least one microphone from a region before the medium transport path; (ii) compute transport path maximum values responsive to the sound values from the at least one microphone from a region within the medium transport path; (iii) compute post transport path maximum values responsive to the sound values from the at least one microphone from a region after the medium transport path; (iv) indicate a location of the medium jam responsive to the maximum values; and (v) produce a calibration loudness value from sound values associated with the medium transport path at a time before an urging roller has urged the medium into the medium transport path; (vi) compare the calibration loudness value to an acceptable tolerance range to determine when calibration is needed; (vii) compare the calibrate loudness value to a default calibration value and increase a jam detection sensitivity when the calibration loudness value is not greater than the default calibration value; and (viii) produce an audible or visual alert to an operator that maintenance or replacement of parts is required when the calibration loudness value is greater than the default calibration loudness and decrease jam sensitivity when the operator indicates that the calibration loudness value is acceptable. (a) one or more rollers for use in conveying a medium along the medium transport path; (b) at least one microphone for detecting the sound of the medium being transported and producing a signal representing the sound; (c) a processor configured to produce sound values from the sound signal and further configured to: (i) compute pre-transport path maximum values responsive to the sound values from the at least one microphone from a region before the medium transport path; (ii) compute transport path maximum values responsive to the sound values from the at least one microphone from a region within the medium transport path; (iii) compute post transport path maximum values responsive to the sound values from the at least one microphone from a region after the medium transport path; (iv) indicate a location of the medium jam responsive to the maximum values; and (v) produce a calibration loudness value from sound values associated with the medium transport path at a time before an urging roller has urged the medium into the medium transport path; (vi) compare the calibration loudness value to an acceptable tolerance range to determine when calibration is needed; (vii) compare the calibrate loudness value to a default calibration value and increase a jam detection sensitivity when the calibration loudness value is not greater than the default calibration value; and (viii) produce an audible or visual alert to an operator that maintenance or replacement of parts is required when the calibration loudness value is greater than the default calibration loudness and decrease jam sensitivity when the operator indicates that the calibration loudness value is acceptable. (i) compute pre-transport path maximum values responsive to the sound values from the at least one microphone from a region before the medium transport path; (ii) compute transport path maximum values responsive to the sound values from the at least one microphone from a region within the medium transport path; (iii) compute post transport path maximum values responsive to the sound values from the at least one microphone from a region after the medium transport path; (iv) indicate a location of the medium jam responsive to the maximum values; and (v) produce a calibration loudness value from sound values associated with the medium transport path at a time before an urging roller has urged the medium into the medium transport path; (vi) compare the calibration loudness value to an acceptable tolerance range to determine when calibration is needed; (vii) compare the calibrate loudness value to a default calibration value and increase a jam detection sensitivity when the calibration loudness value is not greater than the default calibration value; and (viii) produce an audible or visual alert to an operator that maintenance or replacement of parts is required when the calibration loudness value is greater than the default calibration loudness and decrease jam sensitivity when the operator indicates that the calibration loudness value is acceptable.