Introduction to CBT Loudspeaker Arrays
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1 Introduction to CBT Loudspeaker Arrays (ALMA Version, Part 3 of 3) D. B. (Don) Keele, Jr. DBK Associates and Labs Bloomington, IN DKeeleJr@Comcast.net (Copyright 2011) 78
2 Compare Frequency Responses of CBT45 vs. A Conventional High-End Four-Way System (A Revel Salon) Measured at Different Distances and Heights Over a Ground-Plane (Measured Both with and Without Carpet) 79
3 Compare Frequency Responses of CBT45 vs. Revel Salon Over Ground-Plane (Measured Both with and Without Carpet) 80
4 Photos of Revel Salon (Measured Both with and Without Carpet) 81
5 Revel Salon Description 82
6 m 1 m Revel Salon Response vs Height at 0.1m Front of System (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 50ms Window 0.1m 1 m 0.5 m 0 m 1.5 m 2m 83
7 m 1 m Revel Salon Response vs Height at 1m Front of System (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 0 m 50ms Window 1 m 0 m 0.5 m 1 m 1.5 m 0 m 2m 84
8 m 1 m Revel Salon Response vs Height at 2m Front of System (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 50ms Window 1 m 0 m 85
9 8 Revel Salon Response vs Height at 3m Front of System (Over Perfectly Reflective Ground-Plane Surface) m 1 m m Test Mic Locations m 0 m 50ms Window 3 m 1 m 0 m0 m 2m 86
10 What s the Point? The Frequency Response of the Conventional Four-Way System Varies Dramatically with Distance and Height! Where are you going to equalize it? Answer: Only at one distance and height, and you had better sit at that location with your head at that height or it won t sound right! 87
11 m 1 m CBT45 Response vs Height at 0.1m in Front of Array (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 25ms Window 0.1m 0 m 0.5 m 1 m 1.5 m 88
12 m 1 m CBT45 Response vs Height at 1m in Front of Array (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 0 m 25ms Window 1 m 0 m 89
13 m 1 m CBT45 Response vs Height at 2m in Front of Array (Over Perfectly Reflective Ground-Plane Surface) m Test Mic Locations m 25ms Window 0 m 90
14 8 7 6 CBT45 Response vs Height at 3m in Front of Array (Over Perfectly Reflective Ground-Plane Surface) 1.5 m 1 m m Test Mic Locations m 0 m 25ms Window 3 m 0 m 91
15 What s the Point? The Frequency Response of the CBT45 Ground-Plane Line Array Hardly Varies with Distance and Height! Where are you going to equalize it? Answer: Essentially anywhere you want to, even on the floor or in the nearfield, it then won t sound appreciably different no matter where you listen to it! 92
16 1 Revel Salon vs CBT45, 2m On Axis, 1m High (Over Ground Plane) Frequency Response Magnitude and Phase CBT45 Array Revel Salon m Test Mic 6 1 m Location Test Mic Location ms Time Window 93
17 CBT45 Horizontal Off-Axis Frequency Response ms Time Window m Test Mic Location 94
18 Response vs Distance at Seated Height 1m (40 in) 8 7 0m 0.5m 1m 1.5m 2m 2.5m 3m m (40 in) Test Mic Locations 1 95
19 0m Response vs Distance at Standing Height 1.6m (64in) 0.5m 1m 1.5m 2m 2.5m 3m m (64 in) Test Mic Locations Fits a 4 to 5 db response envelope from near to far! 96
20 0m Response vs Distance at Standing Height 1.6m (64in) 0.5m 1m 1.5m 2m 2.5m 3m 8 7 At standing height, 6 Test Mic Locations 5 1.6m (64 in) the frequency response and level of the CBT45 hardly changes at all going from a point standing 4 3 directly over the array out to a point 3 m or 10 ft away! 2 1 Fits a 4 to 5 db response envelope from near to far! In other words, setting a loud level in the rear of the room at 3m, and then walking towards the system, it doesn t get any louder! 97
21 Nearfield Response vs Distance (1, 2, 4 and 8 ) at Seated Height 1m (40 in) 1m (40 in) Test Mic Locations Note uniformity of veryclose response! Is a perfect near-field monitor! 98
22 An Excellent Book! 99
23 Sound-Fields generated above a ground plane by several sources. (Page Images Courtesy Focal Press) 100
24 The Perfect Surround Speaker? (Page Images Courtesy Focal Press) 101
25 CBT Ground-Plane Array Upside Down on the Ceiling (A Long-Throw PA Application) (16 Circular-Arc Array, 12 Beamwidth, 11.5 ft high) 23 Ft 133 Ft 102
26 CBT Ground-Plane Array Upside Down on the Ceiling (16 Circular-Arc Array, 12 Beamwidth, 11.5 ft high) Ceiling Reflection 23 Ft 133 Ft 103
27 CBT Ground-Plane Array Upside Down on the Ceiling (16 Circular-Arc Array, 12 Beamwidth, 11.5 ft high) Ceiling Reflection 23 Ft Standing Height 133 Ft 104
28 Application of CBT arrays in Sound Reinforcement: New CBT Systems: CBT 50LA CBT 100LA CBT 70J 105
29 Application of CBT arrays in Sound Reinforcement: Harman/JBL has copyrighted the term CBT in the loudspeaker industry where it means New CBT Systems: Constant Beamwidth Technology CBT 50LA CBT 100LA CBT 70J 106
30 Application of CBT arrays in Sound Reinforcement: Remember that these JBL systems are the topic of two Harman patents and one pending! New CBT Systems: CBT 50LA CBT 100LA CBT 70J 107
31 Application of CBT arrays in Sound Reinforcement: (Aug. 28, 2008) I received and photos from Marshall Kay concerning large 12 ft tall CBT arrays that they constructed and installed in a large church in North Carolina. Kay is founder and president of loudspeaker manufacturer Audio Artistry. Siegfried Linkwitz works for them and is responsible for their current speaker line. Here is their Beethoven system
32 CBT Arrays Installed in Marshall Kay s large 1200 seat North Carolina Church in a LCR configuration (56 Four inch midrange drivers and 22 Ribbon Drivers) 7/10/2010 Keele - PE Speaker Design Competition ppt 109
33 CBT Arrays Installed in North Carolina Church (Cary Church of God) Cont.: 110
34 CBT Arrays Installed in North Carolina Church (Cary Church of God) Cont.: 111
35 CBT Arrays Installed in North Carolina Church (Cary Church of God) Cont.: 112
36 Side View of Church Array Details: 113
37 Recent Addition by Monte Kay to his Home Theater! (Brother of Marshall Kay, 114
38 16.5" El evat ion 5.5" El evat ion 5.5" st ep 11." st ep 16.5" st ep 11" elevation step Monte Kay s CBT Center Channel (120 Circular-Arc CBT Array, 7 ft Wide) in 22" E levat i on 144" di ag 2.4: 1 screen 42' radius curve E qu ip m e nt R a ck 27. 5" El evat ion in in 9.16 in in in r = in in in 115
39 Monte Kay s CBT Center Channel Uses 132 each Tang Band tweeters (0.77 Dia. Small!!): 116
40 Monte Kay s CBT Center Channel Monte Kay 117
41 That s it! End Part 3 of 3 Nov. 4, 2010 AES San Francisco Keele - Ranking of Loudspeaker Line Arrays 118
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