Polycom C16 - Manual (Page 160)

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
6 - 12
It is also possible to limit the minimum and maximum user gain settings via
SoundStructure Studio software by using the min and max gain limits on the
fader control. This can be done graphically on the channels page as shown in
the following figure or via the SoundStructure API. See the fader command for
the syntax of how to use the min and max user limits.
Because SoundStructure systems receive volume change requests from the
HDX and do not send volume messages to the Polycom HDX, any volume
limit set on the SoundStructure system will not be recognized by the HDX.
This means that while the user adjusts volume on the Polycom HDX, it will
appear as the volume continues to change on the Polycom HDX UI although a
volume limit may have already been reached within the SoundStructure
system which would prevent the system from getting any louder in the room.
Designing With HDX Digital Microphone Arrays
Each HDX digital microphone array has three microphone elements and must
be thought of as three microphone inputs. As a result, each HDX digital
microphone requires the processing of three SoundStructure analog input
channels. In other words, for Because each digital microphone array is
represented as three microphones, every microphone array and its respective
three microphone elements can be used independently with a SoundStructure
device. This means that several HDX microphone arrays can be linked
together and used, for example, in room combining applications where one or
more microphone arrays are in one room and one or more microphone arrays
are in a different room. The different microphone array elements may be
muted and used in the matrix independently as easily as if they were
traditional analog microphones.