Quick Guide for Beginners

CBT Quick Start Guide 17
Example #4 –Three-Tiered Raked, Large Room
Description –This is a larger room with a depth of 39.6 m (130 ft). The room could represent a venue
with dual balcony or it could represent an auditorium with a front section having a gentle rake and
a back having a steeper rake. Shown are the CBT 100LA, CBT 70J and the CBT 70J+70JE
combination. All are set at the Broad Vertical Coverage setting.
Listening Plane = Three tiers
Mic Placement = 7.6 m (25 ft, red icon) and 19.8 m (65 ft, blue icon) on main seating; 22.9 m (75 ft,
green icon) and 32 m (105 ft, pink icon) on middle seating plane; the rear of the back seating plane
at 38.1 m (125 ft, light-blue icon).
CBT 100LA in Broad Setting
Trim Height = 4.3 m (14 ft, Top of Speaker)
Down Tilt = 5°
Vertical Coverage Setting = Broad
SPL
(Full rated power, low-Z, SPEECH setting, 4 kHz, scale in feet):
0
20
40
60
0 40 80 120 160
105
100
95
90
85
80
75
Frequency Response (Full rated power, low-Z, speech setting, mic positions as designated above):
SPL Range
4 kHz