How Far Each Cbt Model "Throws - JBL CBT 50LA Quick Start Manual

How Far Each CBT Model "Throws" – Speaker "throw" has many possible definitions, some of which
require knowledge of venue-specific factors, such as acoustics, seating plane particulars, or SPL
differences between one listening location and another.
One speaker-specific definition of "throw" would be the distance at which the speaker can project a useful
sound level. Using that definition, following are the farthest distances at which each model (in each
combination of Vertical Coverage and Voicing settings) can produce a continuous level of 85 dB (peaks of
91 dB).
85 dB Distance Chart
CBT 50LA
CBT 100LA
CBT 70J
CBT 70J+70JE
This stimulus signal for this chart is 1/3
frequency band is utilized in this chart because it is a challenging range to "throw" long distances yet is
important for articulation, speech intelligibility and musical clarity. 4 kHz also standardizes with the SPL
Maps throughout this Guide.
The distances listed take into consideration the natural attenuation of sound due to air (22°C/72°F, 50%
humidity) – otherwise the distances listed would be even farther.
It should be noted that it may not be advisable to throw these distances if there are also listeners at very
close distances, because levels for the near audience areas may be louder than a normal comfort level.
It may also be noted from the chart that while CBT 70J + 70JE produces greater low frequency SPL and
extended bass response, the mid-range throw is the same as the 70J by itself.
Applications Assistance -- More CBT applications assistance is available at JBL Professional's website
www.jblpro.com or by calling JBL Pro installed-sound technical assistance (818) 894-8850.
(low-Z, full rated power, pink noise, 85 dB-SPL at 4 kHz octave band)
BROAD Setting
Music Mode Speech Mode
Vert.°
30 m (100 ft)
40°
40 m (130 ft)
45°
40 m (130 ft)
45°
rd
octave pink noise centered at 4 kHz at full rated power. This
Vert.°
20°
46 m (150 ft)
15°
64 m (210 ft)
25°
64 m (210 ft)
25°
CBT Quick Start Guide 21
NARROW Setting
Music Mode Speech Mode
18 m (60 ft) 27 m (90 ft)
37 m (120 ft) 55 m (180 ft)
52 m (170 ft) 67 m (220 ft)
52 m (170 ft) 67 m (220 ft)
CBT QSG 04/10
RK/DB/JF