The CHANNEL EQ equalizer works for functional groups and for each channel according to the selection chosen for the display. It is possible to perform an equalization by selecting a single speaker in the system or selecting the entire front of the audio system.
◼︎Difference between IIR and FIR filters
Similarly to crossover filters (see sec 8.7.1), graphic and parametric equalizers based on IIR filters alter the signal phase behaviour with significant effects on audio quality. A heavily equalized signal is characterized by an unclear stereo image and lack of transients definition. Audiophiles often classify this feeling as a veil that blurs the musical message and deprives it of the necessary emotion.
The use of FIR filters guarantees an important result: the phase behaviour is linear, free from rotations or indecisions. This also makes the use of filters with a very high slope (up to 48 dB / Oct) possible, without altering the phase response. Such a high slope for the filter enables the midrange and tweeters mounted on the a-pillar to work at lower frequencies without any issues with power handling, thus raising the emission front. Therefore thanks to the FIR filters the advantages of three or multiple-way systems are completely exploited taking in-car listening experience to a different level. When listening, a system that uses FIR filters provides great clarity in transients reproduction, such as the acoustic piano hammer strikes or the drums. The stereophonic image is deeper and definite. Instruments in the virtual stage are more focused and seem to have more space between them. Even the intervention of any equalizer over the frequency response, when available in FIR technology, does not modify the audio signal phase, allowing more precise and detailed corrections without conditioning the audio quality.
The equalizer works for functional groups and therefore we will have:
- an equalizer for the Front Left Channel;
- an equalizer for the Front Right Channel;
- an equalizer for the Rear Left Channel;
- an equalizer for the Rear Right Channel;
- an equalizer for the Center;
- an equalizer for the Subwoofer.
The software is able to manage both an IIR and FIR configuration chosen during the "I / O Configuration Wizard" phase, and the equalizer setup varies depending on the choice made.
8.8.2.1 IIR GRAPHIC EQ MODE
By clicking on the POP UP activation icon, you can bring the main equalizer commands to full screen. If you do not use the POP UP mode, it will always be possible to tune the system but by reducing the use of the equalizer functions. It is possible to calibrate the output of the edges using a 31-band graphic equalizer. To be able to change the equalizer parameters, in order to set a curve, just select the channel to be equalized from the "Channel Map" menu, and moving the gain of the pole/s on which to intervene. Use the mouse cursor or the menu below.
G(dB): it is possible to set the gain of the selected band by acting on the setup window and adjusting using the Gain (g: -15 dB ÷ + 12dB step min 0.1 dB.
The curve can be manually edited using the mouse pointer. To be able to vary the "F" G" and "Q" factors, you will just need to act on the mouse wheel equipped with this function. A finer adjustment of these parameters can also be made using only the PC keyboard.
- The keys 
and 
: allow the selection of the pole to be adjusted on the diagram. The successful selection of the pole is displayed by a circle around it.
- Keys 
+ and + .
1) MUTE: 
Mute Enabled; 
Mute disabled.
2) SOLO: 
Solo Enabled; 
Solo disabled.
3) FASE: 
Phase not inverted; 
Phase inverted.
4) Multi Sel: it allows the activation of multiple channels on the Channel Map in order to display the total electrical response on Channels EQ.
5) Volume: it manages the overall system volume.
6) Volume Sub: it manages the overall SUB level volume.
During the equalizer calibration, the display shows the changes that are made to the electrical signal that is sent to the speakers via the amplifiers in real time. The actual audio signal reproduced by the system depends on the type of speakers used and their positioning. To analyse the acoustic response, use a spectrum analyser connected to a microphone. Otherwise you need to make use of your experience in listening and refine the calibration by relying on it.
1. Flat / Reset: it restores, if enabled, all the poles of the parametric equalizer in the default position.
2. Link L/R: it applies, when active, the equalization curve to both the right and left channels simultaneously.
3. L->R R->L: this function is active when "Link L / R" is deactivated. By clicking on one of the two keys it is possible to transfer the equalization curve of the Left channel to the Right one and vice versa.
4. Xover: it displays the electrical response subjected to filtering (XOVER), by clicking on the box (red curve).
5. EQ: it displays the electrical response subjected to equalization, by clicking on the box (yellow curve).
6. SUM: it displays the sum between the electric response and the crossover, by clicking on the box (purple curve).
7. PH: It allows the user to view the progress of the electrical phase. Its performance depends on the filters and the equalization applied.
8. EQ Off: when active, it allows the equalizer to be switched off.
8.8.2.1 IIR PARAMETRIC EQ MODE
By clicking on the POP UP activation icon 
, you can bring to Full screen the display of the main controls of the equalizer. If you do not use the POP UP mode it will always be possible to perform system tuning but reducing the use of the equalizer functions. It is possible to calibrate the fronts output using a 13-pole equalizer of which 11 maximum parametric poles and two Shelving (LP HP). Furthermore it is possible to activate up to three Notch and ALLPASS filters according to the crossover frequencies.
To be able to change the equalizer parameters, in order to set an equalization curve, just select the channel to be equalized from the "Channel Map" menu, enable the pole on which to intervene with the mouse cursor and set the configuration to be applied.
The following controls are available on the front equalization curve:
A. 
Parametric pole: it is possible to set the parametric pole by operating on the setup window adjusting the Frequency(f: 20 Hz ÷20KHz step min 1HZ), Gain (g: -15 dB ÷ +12dB step min 0.1 dB) and the Q factor (Q: 0.1÷ 16 step min 0.1) using the cursors.
B. 
Notch filter: it is possible to set the Notch filter by operating on the setup window adjusting the Frequecy (f: 20 Hz ÷20KHz step min 1HZ), and the Bandwidth (BW: 20 Hz ÷5KHz step min 1HZ) using the cursors.
C. 
All Pass 1°/2° order: the All Pass filter can be first-order by clicking once on the icon and second-order by double-clicking. This is automatically positioned on the crossover frequency of the first crossover, and the number of ALL PASS is equal to the crossing points on the fronts. Its function is to re-balance the speakers at their intersection point.
Their activation is displayed by the transition from a point to a well-highlighted intervention area that occurs by setting the phase other than 0 °.
- First-order filter: it is possible to set the All Pass filter by operating on the setup window adjusting the Phase (Phase: 0°÷ -180° step min 1°) using the cursors.
- Second-order filter: it is possible to set the All Pass filter by operating on the setup window adjusting the Phase (Phase: 0°÷ -360° step min 1°) and the Q factor (Q: 0.4÷50) using the cursors.
In the case of the two types of All Pass filters, the intervention will be graphically highlighted on the equalizer curve, using a light blue area.
The curve can be manually edited using the mouse pointer. To be able to vary the "F" G" and "Q" factors, you will just need to act on the mouse wheel equipped with this function. A finer adjustment of these parameters can also be made using only the PC keyboard.
- The keys and : allow the selection of the pole to be adjusted on the diagram. The successful selection of the pole is displayed by a circle around it.
- 
: Key: allows the selection of the “F”,”G” and “Q” poles control point. The successful selection of the control point is visible through the green color of the control slider.
- Keys + and + .
1) MUTE: Mute Enabled; Mute disabled.
2) SOLO: Solo Enabled; Solo disabled.
3) FASE: Phase not inverted; Phase inverted.
4) Multi Sel: it allows the activation of multiple channels on the Channel Map in order to display the total electrical response on Channels EQ.
5) Volume: it manages the overall system volume.
6) Volume Sub: it manages the overall SUB level volume.
During the equalizer calibration, the display shows the changes that are made to the electrical signal that is sent to the speakers via the amplifiers in real time. The actual audio signal reproduced by the system depends on the type of speakers used and their positioning. To analyse the acoustic response, use a spectrum analyser connected to a microphone. Otherwise you need to make use of your experience in listening and refine the calibration by relying on it.
1. Flat / Reset: it restores, if enabled, all the poles of the parametric equalizer in the default position.
2. Link L/R: it applies, when active, the equalization curve to both the right and left channels simultaneously.
3. L->R R->L: this function is active when "Link L / R" is deactivated. By clicking on one of the two keys it is possible to transfer the equalization curve of the Left channel to the Right one and vice versa.
4. Xover: it displays the electrical response subjected to filtering (XOVER), by clicking on the box (red curve).
5. EQ: it displays the electrical response subjected to equalization, by clicking on the box (yellow curve).
6. SUM: it displays the sum between the electric response and the crossover, by clicking on the box (purple curve).
7. PH: It allows the user to view the progress of the electrical phase. Its performance depends on the filters and the equalization applied.
8. EQ Off: when active, it allows the equalizer to be switched off.
Nota: in order to display the set equalization curve more clearly, it is possible to increase or decrease the vertical scale (dB) by moving the cursor positioned to the right of the equalization curve diagram. By default the diagram display is set to ± 12dB.
View example with ± 3dB magnifier function
View example with ± 24dB magnifier function
8.8.2.3 FIR MODE
By clicking on the POP UP activation icon , you can bring to Full screen the display of the main controls of the equalizer. If you do not use the POP UP mode it will always be possible to perform system tuning but reducing the use of the equalizer functions.
It is possible to calibrate the fronts output using a 13-pole equalizer of which 9 FIR poles, 1 Shelving and 3 IIR poles. Furthermore it is possible to activate up to three Notch and ALL PASS filters according to the crossover frequencies.
To be able to change the equalizer parameters, in order to set an equalization curve, just select the channel to be equalized from the "Channel Map" menu, enable the pole on which to intervene with the mouse cursor and set the configuration to be applied.
The following controls are available on the front equalization curve:
◼︎ IIR POLES: by enabling the check from PC software it is possible to enable the use of 3 IIR poles.
A. Parametric pole: it is possible to set the parametric pole by operating on the setup window adjusting the Frequency (f: 500 Hz ÷20KHz step min 1HZ), Gain (g: -15 dB ÷ +15dB step min 0.1 dB) and the Q factor (Q: 0.1÷ 16 step min 0.1) using the cursors.
B. Notch filter: it is possible to set the Notch filter by operating on the setup window adjusting the Frequency (f: 500 Hz ÷20KHz step min 1HZ), and the bandwidth (BW: 20 Hz ÷5KHz step min 1HZ).
C. All Pass 1°/2° ordine: the All Pass filter can be first-order by clicking once on the icon and second-order by double-clicking. This is automatically positioned on the crossover frequency of the first crossover, and the number of ALL PASS is equal to the crossing points on the fronts. Its function is to re-balance the speakers at their intersection point.
-First-order filter: it is possible to set the All Pass filter by operating on the setup window adjusting the Phase (Phase: 0°÷ -180° step min 1°) using the cursors.
- Second-order filter: it is possible to set the All Pass filter by operating on the setup window adjusting the Phase (Phase: 0°÷ -360° step min 1°) and the Q factor (Q: 0.4÷50) using the cursors.
In the case of the two types of All Pass filters, the intervention will be graphically highlighted on the equalizer curve, using a light blue area.
◼︎FIR POLES: it is possible to set the FIR parametric pole by operating on the setup window adjusting the Frequency (f: 100Hz÷20KHz step min 1HZ), Gain (g: -15 dB ÷ +15dB step min 0.1 dB) and the Q factor (Q: 0.1÷ 16 step min 0.1) using the cursors.
The poles can be edited manually using the mouse pointer. To change the "Q" factor, you will just need to act on the mouse wheel equipped with this function.
- The keys and : allow the selection of the pole to be adjusted on the diagram. The successful selection of the pole is displayed by a circle around it.
- : Key: allows the selection of the “F”,”G” and “Q” poles control point. The successful selection of the control point is visible through the green color of the control slider.
- Keys + and + .
1) MUTE: Mute Enabled; Mute disabled.
2) SOLO: Solo Enabled; Solo disabled.
3) FASE: Phase not inverted; Phase inverted.
4) Multi Sel: it allows the activation of multiple channels on the Channel Map in order to display the total electrical response on Channels EQ.
5) Volume: it manages the overall system volume.
6) Volume Sub: it manages the overall SUB level volume.
During the equalizer calibration, the display shows the changes that are made to the electrical signal that is sent to the speakers via the amplifiers in real time. The actual audio signal reproduced by the system depends on the type of speakers used and their positioning. To analyse the acoustic response, use a spectrum analyser connected to a microphone. Otherwise you need to make use of your experiencein listening and refine the calibration by relying on it.
1. Flat / Reset: it restores, if enabled, all the poles of the parametric equalizer in the default position.
2. Link L/R: it applies, when active, the equalization curve to both the right and left channels simultaneously.
3. L->R R->L: this function is active when "Link L / R" is deactivated. By clicking on one of the two keys it is possible to transfer the equalization curve of the Left channel to the Right one and vice versa.
4. Xover: it displays the electrical response subjected to filtering (XOVER), by clicking on the box (red curve).
5. EQ: it displays the electrical response subjected to equalization, by clicking on the box (yellow curve).
6. SUM: it displays the sum between the electric response and the crossover, by clicking on the box (purple curve).
7. PH: It allows the user to view the progress of the electrical phase. Its performance depends on the filters and the equalization applied.
8. EQ Off: when active, it allows the equalizer to be switched off.
Remark: in order to display the set equalization curve more clearly, it is possible to increase or decrease the vertical scale (dB) by moving the cursor positioned to the right of the equalization curve diagram. By default the diagram display is set to ± 12dB.
View example with ± 3dB magnifier function
View example with ± 24dB magnifier function