Avalon Acoustics Sentinel - Manual (Page 4)

9 Room Acoustics and Speaker Position .........................................................................41
Introduction ..............................................................................................41
An Optical Analogy..................................................................................42
Basic Room Acoustics...............................................................................42
9.1 Standing Waves .............................................................................................43
9.2 Flutter Echo ....................................................................................................44
9.3 Early Reflections .............................................................................................45
Avoiding Early Reflections ........................................................................46
Low Frequency Reflections.......................................................................48
9.4 Bass reinforcement.........................................................................................49
9.5 Summary of Recommendations ....................................................................52
Flutter Echo and Standing Waves ............................................................52
Early Reflections........................................................................................53
Speaker Placement..................................................................................53
9.6 A Listening Room Example.............................................................................54
10 Listening Position.........................................................................................................55
Path Length Symmetry .............................................................................55
Time Alignment.........................................................................................55
Summary...................................................................................................56
11 Accuracy of Bass Reproduction .................................................................................57
Introduction ..............................................................................................57
11.1 Sensitivity to Time-Related Information.........................................................58
"Fast Bass"..................................................................................................58
11.2 Measurements of Audio Equipment.............................................................59
A Correlation with Amplifier Measurements.............................................59
Loudspeaker Measurements ....................................................................60
Designing for Accurate Bass Reproduction..............................................61
11.3 Listening Qualities.........................................................................................62
Frequency Response Effects.....................................................................62
Listening for Size Distortions.......................................................................62
Transient Response Effects........................................................................63
11.4 Active Subwoofer System.............................................................................64
Anechoic Frequency Response vs. In-Room Frequency
Response ..................................................................................................64
Active Control of Bass Energy...................................................................64
12 Features ......................................................................................................................65
13 Specifications..............................................................................................................66
Loudspeaker.............................................................................................66
Subwoofer Amplifier .................................................................................66
14 Notes...........................................................................................................................67