Ashly mXa-1502 Operating Manual page 23

mXa-1502 • Operating Manual
FIR Filter
(output channels 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 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.
Both file types will work in AquaControl.
The DSP sample rate is always 48kHz.
FIR filters on this device can have from 2 up to
512 taps.
AquaControl software does not offer the ability
to view or edit the EQ curve or phase response
generated by a FIR filter.
Ashly AquaControl™ Software
*.fir file example:
; comments section *
sampleRate = 48000 *
____________
+0.0000042920
+0.0000030236
-0.0000040482
*The comments section and key=value pair definition
(in this example sample rate) are not necessary in a *.fir
file. AquaControl ignores text headers and only uses
the actual coefficient values, which can be either line
separated or comma separated.
*.csv file example:
+0.0000042920, +0.0000030236, -0.0000040482
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