Troubleshooting guide

Creating a Configuration
SHURE
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P4800 System Processor Software Guide Page 22 of 108
Crossovers and Splitters
Since they are output processors, crossovers can only be placed on output channel strips. They can be
added to output strips like any other processor block, but you must take into account the following:
§ A crossover extends downward to span the specified number of outputs, so you must
select a channel strip that has enough outputs below it.
§ A crossover block can only span consecutive outputs.
§ Crossovers cannot overlap on any output strips.
§ Mix points will disappear from all outputs spanned by the crossover, except the top
channel strip.
§ Processor slots to the left of the crossover will disappear from outputs below the top strip.
§ Splitters possess the same signal flow ramifications and restrictions as crossovers.
If your configuration calls for crossovers, they should be added to the signal flow diagram before you
connect mix points or add other processors to the output channel strips.
Ducker
The ducker should be placed only on the input channel strip that carries the paging signal. The system
will not allow you to place a ducker on an output strip.
Replacing Processors
Only one processor block at a time can occupy a given slot. To replace an existing processor with another,
first delete it from the slot then add the new processor using any of the methods described above.
Managing DSP Resources
Although the P4800 has sufficient processing power for many applications, it is possible to populate
the signal flow diagram with more processor blocks than the device's DSP (digital signal processing)
resources can handle. This section explains in general terms how the System Processor manages the
signal processing requirements of a configuration, and gives you some hints on how to get the most
out of the DSP resources.
Resource Allocation
By placing a processor block on a channel strip, you are allocating the DSP resources necessary for it to
run at its maximum capacity. This is why so many varieties of the same type of processor blocks are
provided; so that you can select only the amount of processing you actually need for a given module. When
you are designing a simple configuration, it is not critical to pay attention to how much DSP is being utilized.
However, the more complicated the configuration, the more important it is to select processor blocks that
use the minimal processing resources necessary to get the job done.
For example: when you place a ten-band parametric EQ on a channel strip, you will instantly allocate
the processing power required by all ten filters, even if you are only using four of them. The PEQ5
would be the best choice, in this instance.
Delay Memory
The System Processor has a memory buffer that will hold up to 20 seconds of delay time, which you
can divide among any combination of delay processors. Like DSP resources, delay memory is
allocated to each processor block according to the maximum delay time indicated in the block name.
For example, if you need 45 ms of delay, don’t use the 2-second delay when the 150ms delay will
do just as well. Even though both processors may be set to the same values, the DLY 2s block still
occupies a full two seconds of delay memory.
Note: Do not confuse delay memory with DSP resources. Each delay utilizes the same
amount of DSP, regardless of its maximum delay time.