54. Design and Implementation of a Practical Long-Throw High-Q CBT Array

AES Convention: 143 Paper Number:375
Publication Date: 2017-10-06

This paper describes the design and construction of a very-tall 5m experimental passive long-throw high-Q CBT array that provides coverage in a large church general-purpose activity room with a full-size basketball court. The room is 7.8 x 20 x 30 m (H x W x L). The 5 m tall 20° circular- arc array contains 80 ea 63.5 mm (2.5”) full-range drivers, and provides a tight 15° vertical beamwidth. The mechanically aimed no-DSP passive segmented design is composed of five straight-front boxes each containing 16 drivers. Series-parallel connections, resistive attenuators, and two power amplifiers provide the frequency-independent four-bank CBT shading. This paper also provides detailed simulation data of the array’s predicted beamwidth vs. frequency, directivity, vertical polar response, axial foot prints and predicted frequency response at three different downward tilt angles. The array provides very-even coverage along the entire length of the 30 m room.

Click to Browse

Keele, Jr., D. B. (Don); Kay, Marshall; 2017; Design and Implementation of a Practical Long-Throw High-Q CBT Array [PDF]; DBK Associates and Labs, Bloomington, IN, USA; Keysight Technologies, Apex, NC, USA; Paper 375; Available from: https://aes2.org/publications/elibrary-page/?id=19326