User Manual

10
Installation Environment
Room Size
A small room may not achieve enough sound pressure increment as more sound will be
diffracted due to the RM-CG and speakers that are placed closer to each other. Therefore, if
you are designing a system for a room with less than 10m depth, please reconsider if a voice
lift system is really needed as a presenter's voice can directly reach all the participants in the
room and may not need to be amplified.
Background Noise Level
For a successful voice lift system, the background noise level must be low enough compared
to the sound to be picked up. If the background noise is loud, the microphone will also pick
up the noise; so the sound will be unclear. Please make sure that background noise is low
enough in the room before designing a system. Also, avoid installing the RM-CG close to a
device that produces background noise such as an air conditioner and projector as the
beamforming arrays will pick up the noise. (* The RM-CG has a Noise Reduction function,
but Output 2 - used for voice lift purposes - does not have this function.)
Acoustic
A room with too much reverberation is not suitable for a voice lift system as such rooms are
prone to generate feedback. To use a voice lift system in a room with a lot of reverberation,
reduce reverberation by installing suitable acoustic absorbing materials prior to installing
microphones and speakers.
RM-CG Settings
Low Latency Mode
To obtain clear sound, it is important to make the latency of amplified sound as low as
possible.
The RM-CG has two Dante output channels. To make the latency low, use Dante Output CH2
which is set to the Low Latency mode. Dante Output CH1 outputs audio picked up by the
RM-CG after being processed by AEC, etc. Because of this, Output Ch1 has higher latency.
Dante Output CH2 outputs sound picked up by the RM-CG without audio signal processing
except for the internal beam control processing if it is set to the Low Latency mode. Therefore,
Dante Output CH2 can keep the RM-CG's latency to around 21 msec.
For a voice lift system, set the RM-CG to Low Latency mode and use Dante Output
CH2 to get the best results.