VJ11		CONTENTS
CHAPTER						PAGE
5.15	ACOUSTICAL IMPEDANCE OF A CIRCULAR ORIFICE IN A WALL
	OF INFINITESIMAL THICKNESS		••••..........		••••.••.....		99
5.16 ACOUSTICAL IMPEDANCE OF AN OPEN				PIPE WITH		LARGE
	FLANGES ••.••.•..••..••••.•		...••.........		••••••••.....		99
5.17	HORNS •••••••.••.••••••••••••••••...			•.••••••••••••••••			100
5.18	FUNDAMENTAL HORN EQUATION ..•••••••.•........					•••.•	100
5.19	INFINITE	CYLINDRICAL HORN (INFINITE			PIPE) .......	•..	101
5.20	INFINITE	PARABOLIC HORN .......	•••••••••.•......			•••••	102
5.21	INFINITE CONICAL HORN •••..		•••.••••••.•••.•••••••••••				102
5.22	INFINITE EXPONENTIAL HORN •.•••..			•....	•••••••••••...		103
5.23	INFINITE HYPERBOLIC HORN ••••••...			••....	••.•••••••...		104

5.24THROAT ACOUSTICAL IMPEDANCE CHARACTERISTIC OF INFI­ NITE PARABOLIC, CONICAL, EXPONENTIAL, HYPERBOLIC AND

	CYLINDRICAL HORNS •••.•.........		••••••••		........••..	•	104
5.25	FINITE	CYLINDRICAL HORN .......	•..•....	•........	•.•.•		105
5.26	FINITE	CONICAL HORN ••..•......	••.••.•.•..... ..		• •••..		106

5.27FINITE EXPONENTIAL HORN .•.••.••.•••••••.••••••••••• 108

5.28THROAT ACOUSTICAL IMPEDANCE CHARACTERISTICS OF FI­

	NITE EXPONENTIAL HORNS •••••.........		•.•••••••••		....	110
5.29	EXPONENTIAL CONNECTORS .••••.••........		•.•••••••••.•			112
5.30	A HORN CONSISTING OF MANIFOLD EXPONENTIAL SECTIONS					114
5.31	CLOSED PIPE WITH A FLANGE .....••.•.•••..........			••.•		115
5.32	SOUND TRANSMISSION IN TUBES	•..••...	•.•........	•..	••	116
5.33	TRANSMISSION FROM ONE PIPE TO ANOTHER PIPE OF DIF­
	FERENT CROSS-SECTIONAL AREA ......	•..	•..........	•••.•.		117
5.34	TRANSMISSION THROUGH THREE PIPES .....•••••••••....					119
5.35	TRANSMISSION FROM ONE MEDIUM TO ANOTHER MEDIUM..					120
5;36	TRANSMISSION THROUGH THREE	MEDIA	....•••••.•••..		• .	121

5.37TUBES LINED WITH ABSORBING MATERIAL •••••••••••...• 121

5.38RESPONSE OF A VIBRATING SYSTEM OF ONE DEGREE OF FREE­

	DOM ..• ............	•.•..........	•....	•	.. • ...........		••	122
VI. DIRECT RADIATOR LOUDSPEAKERS
6.1	INTRODUCTION ••........	•••••••.•.....		•	... ••• . ••		..••...	124
6.2	SINGLE-COIL, SINGLE-CONE LOUDSPEAKER ....•.••.••.....							125
6.3	MULTIPLE, SINGLE-CONE, SINGLE-COIL LOUDSPEAKER •••...							137
6.4	SINGLE-COIL, DOUBLE-CONE LOUDSPEAKER				• .. ••• . •••••....			141
6.5	DOUBLE-COIL. SINGLE-CONE LOUDSPEAKER				• .........		••.••	143
6.6	DOUBLE-COIL. DOUBLE-CONE		LOUDSPEAKER .....		••	•..	••••.	143

6.7MECHANICAL NETWORKS FOR CONTROLLING THE HIGH FRE­

QUENCY RESPONSE OF A LOUDSPEAKER ••••••.•...•••.••••	147
A. Conventional Single-Coil Loudspeaker .. . . . . . . . . . . . ..	147
B. Loudspeaker with a Compliance Shunting the Cone
Mechanical Impedance ............................	148
C. Loudspeaker with a Compliance Shunting; a Compli­
ance and Mass in Parallel. Connected in Series with
the Cone Mechanical Impedance ...................	148

D.Loudspeaker with a "T" Type Filter Connecting the Voice Coil Mass and the Cone Mechanical Impedance 148