User Manual

13
Supplementary Audio
Installation of Sub-speakers in Front
A voice lift system with the RM-CG and ceiling speakers may not deliver sound at a sufficient
volume level to the listeners in front. Ceiling speakers or VXL1-16-Ps installed in front for
supplementation (see the figure above) can resolve an unusual situation where the listeners
in front hear the presenter’s voice from behind. Though those speakers cannot achieve
sound pressure increment as much as other ceiling speakers can, the farther the sub-
speakers are installed from the RM-CG, the higher the system can make sound pressure.
Sound pressure increment verification result when sub-speakers are installed
System
Distance (RM-CG ⇔ Speaker)
4.5m
11.8m
SPL
Increment
SPL
Increment
w/o Voice Lift
54.8 dBA
51.8 dBA
Voice Lift
62.6 dBA
+7.8dB
65.3 dBA
+13.5dB
Voice Lift with sub
speakers
60.4 dBA
+5.6dB
62.6 dBA
+10.8dB