Level Alignment Settings; Subwoofer Low-Pass Filter Settings; Decimation Settings & Advanced Fir Settings; Advanced Fir Settings - Trinnov Audio ALTITUDE 16 User Manual

7.5.6 _FIR AND IIR SETTINGS
FIR stands for Finite Impulse Response. FIR filters are used to optimize amplitude and/or phase.
IIR stands for Infinite Impulse Response. IIR filters are minimum phase filters used by the automatic com-
pensation in addition to FIR for the low frequencies.
• FIR filter length (default is 100ms): Defines the length or number of taps of the FIR filter. The longer the FIR
filter, the higher resolution the correction.
• Number of IIR filters (default is 10): The number of IIR filters that will be used on every channel.
• IIR filters minimal/maximal frequency (default is Automatic/150Hz): IIR filters will be positioned from the
min frequency up to the max frequency. The Automatic parameter uses the minimum frequency of the speaker
bandwidth and the Low-freq auto transition bandwidth parameter to calculate the IIR filter minimal frequency.
• Low-freq auto transition bandwidth (default is 1 octave): Determines the bandwidth of the auto transition. The
auto transition is the frequency range that separates the Optimized frequency range from the unfiltered frequen-
cy range in the low end. The upper boundary of this auto transition bandwidth is the minimal frequency of the
bandwidth of the speaker.
• Room smoothing method (default is Modulus): For advanced users only.
• Norm used for level_hp (!= align) (default is Room): For advanced users only.

7.5.7 _LEVEL ALIGNMENT SETTINGS

• Weighting used for levels (default is dBA): Sets the type of weighting used by the optimizer for level align-
ment.
• Width of level window (default is
every speaker. Its width can be modified to improve the automatic level alignment.
• Maximum/minimum gain on speakers (default is 10dB/-20dB): defines the maximum/minimum gain that
will be applied for the automatic level alignment.
• Minimal/maximal bandwidth frequency (default is 10Hz/Unlimited): defines the high end/ low end of the
bandwidth that is used as the starting point for level computations.
• Bandwidth determination mode (default is Normal): Defines the speakers automatic bandwidth determina-
tion mode from measurements.

7.5.8 _SUBWOOFER LOW-PASS FILTER SETTINGS

The Optimizer includes a subwoofer low-pass filter with the following options:
• Cutoff frequency (Default is "disabled"): Defines the cutoff frequency for the low-pass filter that can be applied
to the subwoofer.
• Filter type (Default is Butterworth): Defines the type of filter used at the cutoff frequency. The elliptic filter is
sharper than the Butterworth but shows ripples in the whole bandwidth.
• Filter order (Default is 4): Defines the steepness of the filter. The slope gets stiffer as you increase the filter order.
Please be aware that such changes may result in significant phase shifts
• Rp value (For elliptical filter) (default is 0.1 dB): Sets a maximum amplitude ripple above the cutoff frequency.
• Rs value (For elliptical filter) (default is 80 dB): Defines the attenuation below the cutoff frequency.
7.5.9 _DECIMATION SETTINGS & ADVANCED FIR SETTINGS
IMPORTANT NOTE: It is strongly recommended not to change these settings unless you have been requested to do so by
!
your Trinnov Distributor.

7.5. 1 0 _ADVANCED FIR SETTINGS

IMPORTANT NOTE: It is strongly recommended not to change these settings unless you have been requested to do so by
!
your Trinnov Distributor.
/f): This time-frequency window is used to compute the perceptual level of
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