Trinnov Audio Altitude 32, User Manual

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ACOUSTICS CORRECTION
The user can determine the type of filters for the automatic correction:

FIR + IIR: This is the default setting used by the Optimizer: both IIR and FIR filters are used to work on the
speaker responses full range;

FIR only: No IIR filters are used, which means that the Optimizer will only work on the mid and high range of the
speaker responses. The low range will not be optimized;

IIR only: With this setting, both the automatic FIR and the FIR EQ are disabled. The Optimizer will only use IIR
filters to work on the low range. This setting could be used in specific cases where the user wants to be sure
that no FIR filters at all are applied.

High-pass filter frequency: Defines the cutoff frequency for the high-pass filter applied to all channels. Can be
disabled.
CALIBRATION SETTINGS

Threshold for resp begin detect: The threshold below the peak level of the impulse that is taken into
consideration to determine the onset of the response. -15 dB is the default value and works in most cases.
However, a lower threshold is recommended in a room with a huge amount of early reflections where the peak
might not be detected correctly.
OPTIMIZE ACCORDING TO L&R SPEAKERS SETTINGS
The Optimizer mode “According to L&R speakers” can be configured with specific settings:

Processing on L&R target (default is IIR only): If the optimize mode is set to “Optimize according to L&R
speakers” in the main settings tab, the Optimizer only uses IIR filters on the L&R speakers. This can be switched
to “None” to make sure the L&R speakers are not optimized at all.

Align L&R on target (default is On): If this setting is on, the Optimizer applies filters on the Left & Right speakers
using their average response as target. If this setting is off, only the center and surround channels are
optimized.
 Optimizer Phase (Default is On): Determines whether the Optimizer should optimize the phase response of the
speakers or not when the According to L&R speakers mode is on.
FIR AND IIR SETTINGS
FIR stands for Finite Impulse Response. FIR filters are used to compensate for amplitude and/or phase
IIR stands for Infinite Impulse Response. IIR filters are minimal phase filters used by the automatic compensation 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 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
frequency 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.