125Chapter 6
Small Room Acoustics
by Doug Jones
6.1 Introduction............................................................................. 127
6.2 Room Modes............................................................................ 127
6.3 Modal Room Resonances.................................................................. 128
6.3.1 Comparison of Modal Potency........................................................... 131
6.3.2 Modal Bandwidth..................................................................... 131
6.4 Criteria for Evaluating Room Modes......................................................... 132
6.5 Modes in Nonrectangular Rooms............................................................ 133
6.6 Summation of Modal Effect................................................................ 134
6.7 The Question of Reverberation.............................................................. 135
6.7.1 Room Shape......................................................................... 138
6.7.2 Reflection Manipulation................................................................ 138
6.7.3 Comb Filters......................................................................... 139
6.8 Small Room Design Factors................................................................ 140
6.8.1 The Control Room Controversy.......................................................... 140
6.8.2 Precision Listening Rooms.............................................................. 140
6.8.3 Rooms for Microphones................................................................ 141
6.9 Rooms for Entertainment.................................................................. 142
References................................................................................. 143