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Latency
The latency parameter allows to control the I/O delay added by the FIR filtering. As a general rule,
higher latencies should be preferred where the compensation accuracy is the main target, while lower
latency values is often used in live sound system, where the I/O delay is a critical application
parameter.
The effectiveness in reducing the latency, leaving unchanged the compensation capability of the FIR
filter, depends on the original loudspeaker IR, but, in the most cases, latency values greater or equal
to 2.5ms allow to preserve almost unchanged the filter correction effects.
The following pictures compare the frequency responses (both in magnitude and group delay) of two
filters with a latency value of 5ms (in the left side graph) and of 2.5ms (in the right side graph).
Reducing the latency below 2.5ms is even possible, with a lower compensation accuracy.
The picture below shows the magnitude and group delay plots for a latency value equals to 1.5ms: the
frequency response starts to be significantly different from the ideal one, especially for the magnitude
response (see the yellow curves)
