Correcting the Frequency Response(s)

This procedure shows how to compensate for the frequency responses of the speakers or that of the whole car cabin. Conversely, this procedure can also be used as a way to simulate the vehicle's speaker frequency responses for an "in-lab" use of the software.

Prerequisites: The Multichannel audio output mode must be selected.

Select the Settings tab.
Click the Speaker setup button to open the Audio output configuration window.
If the audio output is turned on (), click the speaker button to turn it off.
Make sure the Multichannel audio output mode is selected.
In the EQ column:
- activate the Linked mode if you want to use the equalizer over all the channels at once,
- activate the Unlinked mode if you want to use a specific equalizer for each channel.
Click to open the Parametric equalizer for each channel, and edit the frequency response as required using the controls below.
By default, the Parametric equalizer is configured with 8 peaknotch filters centered on the octave bands, giving a flat frequency response over the entire spectrum.

Each filter can be edited either by using the text boxes and drop-down menus, or by clicking and dragging in the graphical display (see below).

The following parameters are available for each filter:
- Filter type - allows you select the filter type from the following options:
  - peaknotch (default)
  - lowpass
  - highpass
  - bandpass
  - bandstop
  - lowshelf
  - highshelf
  - reasonant
  - allpass
- F(Hz) - sets the center or cutoff frequency (depending on the selected filter type)
- G(dB) - sets the filter gain
- Q - sets the Q factor of the filter
- Reset - resets that filter to a peaknotch filer with zero dB gain, centered at the original frequency
You can save the filter definitions by clicking the button or load a previously-saved configuration by clicking the button.

The frequency response for multichannel audio output is now configured.