Lectrosonics LCA16 - Manual (Page 9)

PRE-CONFIGURING THE LCA16 PRIOR TO INSTALLATION,
MORE THAN 16 MICS PER LCA16
PROCEDURE 2 - Use this procedure for those installations where there are more microphone channels than logic
inputs.
The only difference between this setup and the setup described previously is that you have assigned multiple
microphones to the same logic input because they are affected by the same group of speakers. This practice
is only necessary when the number of microphones exceeds the number of logic inputs in the installation.
Using the LCA16 SYSTEM WORKSHEET
To fill out this chart, you will need a floor plan of the room showing both speaker and microphone placement. See
below for an example of a floor plan with notations showing mics, speakers, and attenuation zones.
STEP 1 - On your floor plan, assign consecutive numbers to each microphone, starting with #1.
STEP 2 - Assign Consecutive numbers to each speaker on the floor plan, again starting with #1.
STEP 3 - This step is critical for assigning multiple microphones to the same logic input. As you look at your floor plan,
check to see which microphones will be affected by exactly the same speakers. These microphone channels
can be wired to the same logic inputs. For example, if microphones 1 and 2 are both affected by the same
speaker, then you can assign both mics to logic input 1 (see Example 3). These logic input assignments will
assist you when wiring the twisted pair wires from your logic connections on the automatic mixer to the logic
connections on the LCA16. Repeat this step for each group of microphones.
1
1
5
3
A
B
B
A
B
2
4
A
s
s
igned
STEP 4 - Assigning Attenuation Levels. In this step you will be noting in each box how much the speakers need to
CHAIR
SPEAKER
MICROPHONE
EXCERPT FROM
ROOM PLAN
B LEVEL ATTENUATION ZONE FOR MIC 1
TABLE
1 2
1 2 3 4 5
Mi
cs
be attenuated.
4A Start with the box where the SPEAKER 1 column intersects the logic input 1 row. Check your floor plan. If
the speaker 1 will be a potential source of feedback for microphone 1, then mark that box. Us an "A" for
speakers which are very close to the microphone and a "B" for those which are located further from the
microphone. While still referring to the floor plan, move down to the next box in the speaker 1 column (where
it intersects with logic input 2). If speaker 1 may also be a source of feedback for the mics assigned to logic
input 2, then mark that box accordingly.
If it is unlikely that feedback will occur, then leave the box blank.
4B Repeat this step for every box in the grid where a microphone/logic input row and a speaker column
intersect.
A LEVEL ATTENUATION ZONE FOR MIC 1
SPEAKER
2 3 4
1
2
3
STEP 3
STEP 4
Figure 8 - Example 3
8