MF Audio Measuring System: Table of Contents 1/277 1 HARDWARE SETUP ................................................................................... 12 1.1 General .................................................................................................................... 12 1.2 Analog I/O’s............................................................................................................ 13 1.2.1 Inputs..................................................................................................................13 1.2.2 Outputs...............................................................................................................13 1.2.3 Monitor Amplifier..............................................................................................13 1.2.4 AD/DA Converter..............................................................................................14 2 SOFTWARE SETUP.................................................................................... 15 2.1 General .................................................................................................................... 15 2.2 AD/DA Converter .................................................................................................. 16 2.3 Processor and Memory......................................................................................... 19 2.4 Graphics and Printer ............................................................................................ 20 2.5 Data File Management.......................................................................................... 21 3 THE MF MENUS.......................................................................................... 24 3.1 File............................................................................................................................ 24 3.1.1 File Header .........................................................................................................25 3.2 Domain .................................................................................................................... 29 3.3 Display..................................................................................................................... 31 3.4 Edit........................................................................................................................... 33 © by Audio & Acoustics Consulting Aachen V 3.2E printed 12.12.99 11:02 MF Audio Measuring System: Table of Contents 2/277 3.5 Info........................................................................................................................... 37 3.6 Transformations .................................................................................................... 38 3.7 AD/DA..................................................................................................................... 42 3.8 DSP .......................................................................................................................... 44 3.9 Plot........................................................................................................................... 45 3.10 Macro....................................................................................................................... 46 3.11 Utility....................................................................................................................... 47 3.12 Help.......................................................................................................................... 48 4 MEASURING PREPARATIONS...................................................................49 4.1 I/O level................................................................................................................... 49 4.2 Test Signals............................................................................................................. 51 4.2.1 Maximum Length Sequences...........................................................................51 4.3 Sweep Signals......................................................................................................... 54 4.4 Calibration.............................................................................................................. 55 4.5 Display..................................................................................................................... 56 5 MEASURING MICROPHONES AND AMPLIFIERS.....................................58 6 MEASURING LOUDSPEAKERS .................................................................60 6.1 Complex frequency response............................................................................... 61 6.2 Time Response....................................................................................................... 64 © by Audio & Acoustics Consulting Aachen V 3.2E printed 12.12.99 11:02 MF Audio Measuring System: Table of Contents 3/277 6.3 THD.......................................................................................................................... 68 6.4 Dispersion Characteristics................................................................................... 71 6.5 Conclusions............................................................................................................. 75 7 JOE DELAY‘S LITTLE MEASURING PRIMER........................................... 76 7.1.1 Impulse...............................................................................................................77 7.1.2 Two-channel FFT Analysis...............................................................................78 7.1.3 Deterministic Signals with FFT Block Length .................................................79 7.2 Time Delay Spectrometry ..................................................................................... 83 7.3 Interference............................................................................................................. 88 7.4 Maximum Length Sequences .............................................................................. 92 7.5 Test Signal Coloring.............................................................................................. 96 7.6 Windowing............................................................................................................104 8 EXAMPLES ............................................................................................... 108 8.1 Hardware Settings ...............................................................................................108 8.2 EQ and Amplifier Frequency Response Measuring......................................112 8.3 Loudspeaker Frequency Response Measuring ..............................................120 8.3.1 Environment.....................................................................................................120 8.3.2 Sensitivity 1W/1m ...........................................................................................120 8.3.3 Test Signals ......................................................................................................121 8.3.4 Reference Measuring.......................................................................................121 © by Audio & Acoustics Consulting Aachen V 3.2E printed 12.12.99 11:02 MF Audio Measuring System: Table of Contents 4/277 8.3.5 Levels ...............................................................................................................125 8.3.6 Loudspeaker Measuring..................................................................................126 8.4 Impulse and Step Response Measuring........................................................... 138 8.5 Impulse Response Pre- and Post-comp and Delay Shift Options................ 141 8.6 Generating Decay Response Spectra................................................................ 146 8.6.1 Maxils...............................................................................................................147 8.7 Polar Measuring of Loudspeakers ................................................................... 151 8.7.1 Polar Measuring Steps and Variations ...........................................................153 8.7.2 Rotary Plate......................................................................................................155 8.7.3 The Polar Response Menu..............................................................................156 8.7.4 Polar Measuring Windows..............................................................................161 8.7.5 Processing by Excel 5.0...................................................................................162 8.8 Measuring and Evaluating UNF and GDF Data............................................ 163 8.9 Measuring Maximum SPL and THD of Loudspeakers ................................ 164 8.10 Measuring Impedance and Thiele-Small Parameters ................................... 179 8.11 Measuring S/N and Noise Levels...................................................................... 187 8.12 Measuring Power Amplifiers ............................................................................ 195 8.13 Measuring and Evaluating Room Impulse Response ................................... 196 8.13.1 Measuring Room Impulse Response with Loudspeakers.............................196 8.13.2 Measuring Menu..............................................................................................197 8.13.3 Reference Measuring.......................................................................................197