CONTENTS xi 



Chapter Page 



C. Loud Speaker with a Compliance Shunting; a Compliance and 



Mass in Parallel, Connected in Series with Cone Impedance. ... 125 



D. Loud Speaker with a "T" Type Filter Connecting the Voice Coil 



Mass and the Cone Impedance 127 



7.8 Loud Speaker Baffles 127 



7.9 Cabinet Reproducers 129 



7.10 Back Enclosed Cabinet Loud Speaker 130 



7.11 Acoustic Phase Inverter 131 



7.12 Acoustical Labyrinth Loud Speaker 132 



7.13 Combination Horn and Direct Radiator Loud Speaker 133 



7.14 Feedback Applied to a Loud Speaker 135 



7.15 Nonlinear Distortion 136 



7.16 Transient Response '. . 138 



7.17 Diaphragms (Cones) and Voice Coils 142 



7.18 Field Structures 143 



7.19 High Frequency Sound Distributor. . 143 



VIII. HORN LOUD SPEAKERS 



8.1 Introduction 145 



8.2 Efficiency 145 



A. The Relation Between the Voice Coil Mass, the Load Resistance 



and the Initial Efficiency 146 



B. The Effect of the Mass of the Vibrating System Upon the Efficiency 149 



C. The Effect of the Air Chamber Upon the Efficiency 150 



D. The Effect of the Generator Impedance and the Impedance at the 



Throat of the Horn Upon the Efficiency 153 



E. The Effect of the Voice Coil Temperature Upon the Efficiency. . . 154 



F. The Effect of the Radiation from the Unloaded Side of the Dia- 



phragm Upon the Efficiency 155 



8.3 Nonlinear Distortion 156 



A. Distortion Due to Air Overload in the Horn 156 



B. Distortion Due to Variation in Volume of the Air Chamber 157 



C. Distortion Due to the Diaphragm Suspension System 160 



D. Distortion Due to a Nonuniform Magnetic Field in the Air Gap.. 161 



E. Subharmonic Distortion 162 



F. Power Handling Capacity and the Voice Coil Temperature 163 



G. Power Handhng Capacity and the Amplitude of the Diaphragm. 164 



8.4 Horn Loud Speaker System 



A. Single Horn, Single Channel System 164 



B. Multiple Horn, Multiple Channel System 167 



C. Compound Horn Loud Speaker 168 



D. Multiple Horn, Single Channel System 169 



E. Folded Horns 170 



F. Diaphragms and Voice Coils 171 



