LAB REPORT: PMC twenty.21

摘要

PMC's claim of 87dB sensitivity for the twenty.21 is confirmed only by the simple average of our FFT data, which gives undue emphasis to high frequency output. Using the standard pink noise measure sensitivity falls to below 85dB - a figure more consistent with the twenty.21 's perceived sensitivity, which is distinctly below average albeit fair for a speaker of these compact dimensions. The reason for the significant difference between the mean and pink noise figures is clear from the on-axis response measurements [see Graph 1, below, measured at tweeter height with grille removed] which show a distinct shelving up of output in the tweeter passband.