Ashly mXa-1502 12-Channel 4-Zone DSP Mixer-Amplifier - Manual (Page 23)

popular. However, crossover filter types
must be carefully selected to match the
acoustic response of the specific loudspeaker
system. Please consult the manufacturer of
the loudspeaker system for recommended
crossover frequencies and filter types.
FIR Filter (output only)
A FIR (finite impulse response) filter is typically
used when a speaker manufacturer develops
and provides a proprietary FIR coefficient
file that corresponds directly to their own
loudspeaker or speaker cabinet, addressing
frequency and phase issues based on their own
measurements and formulations.
Plugging in a FIR filter DSP block then clicking
on it will prompt the user for a *.fir or *.csv
text file, which is then loaded and applied to
the output DSP. The two file types will have
identical coefficient code, however the *.fir file
may add comments (designated by a semi-
colon) or a key=value pair definition such as
sample rate. Either file type will work.
*.fir file example:
; comments section
sampleRate = 48000
+0.0000042920
+0.0000030236
-0.0000040482
*.csv file example:
+0.0000042920
+0.0000030236
-0.0000040482
The software does not offer the ability to view
or edit the EQ curve as produced by a FIR filter.
FIR filters on this device can have from 2 up to
512 taps.
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mXa-1502 • Operating Manual Ashly AquaControl™ Software