AXTON A400 Руководство по установке и эксплуатации - Страница 7

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5. CROSSOVER ADJUSTMENTS

For the amplifier to perform best with your speakers, the electronic crossover controls must

be set and adjusted accordingly.

5.1 SELECTING THE OPERATION MODE

You must select and set the appropriate operation mode before you can proceed to

adjust crossover frequency points. This operation mode depends on the speaker system

connected to the respective amplifier channels.

➞ Select HIGHPASS, if the speaker system is a component-, coaxial- or triaxial- type.

➞ Select LOWPASS for a subwoofer system.

➞ Select FULL, if your speaker system will handle a full range signal without electrical or

mechanical overload.

5.2 HIGH PASS CROSSOVER FREQUENCY

For satellite speaker systems, select the "HPF" mode, to cut off the bass content in the

music signal.

Highpass filtering will take away unnecessary mechanical and electrical 'strain' from the

connected coaxial or component speaker systems. Depending on cone surface, voice-coil

diameter and the power handling of the speakers, the following recommendations can be

issued:

FRONT DOOR SATELLITE SPEAKER SYSTEM („HPF" MODE)

13 cm 2-way Component System

16 cm 2- or 3-way Component System

REAR SATELLITE SPEAKER SYSTEM („HPF" MODE)

13 cm 2-way Coaxial or Component System

16 cm 2-way Coaxial or Component System

6x9" or 7x10" Triaxial Speaker System

* When a subwoofer is part of the audio system install.

5.3 LOW PASS CROSSOVER FREQUENCY

Select "LPF", to activate the lowpass filter of the integrated electronic crossover.

The LOWPASS cut-off frequency setting depends on the woofer system and each vehicle is

different! As a rule of thumb, settings in between 60 to 90 Hz will usually give solid results.

The woofer lowpass frequency point is mostly a matter of taste, and must therefore be

'played by ear'.

HP CROSSOVER

FREQUENCY

80 - 110Hz

50 - 80Hz

HP CROSSOVER

FREQUENCY

100 - 120Hz*

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5.4 SUBSONIC CROSSOVER FREQUENCY (A100)

Now proceed to adjust the subsonic highpass frequency. This subsonic crossover frequency

point depends on the size and the power handling of the installed subwoofer system. The

higher the subsonic crossover frequency is set, the better or higher mechanical power

handling will result. The trade-off is reduced low end extension! The subsonic highpass

cannot be bypassed. But you can set the potentiometer to a value of 10Hz to make

subsonic filtering completely inaudible.

5.5 BASS BOOST (A100)

Depending on the size and output capacity of the subwoofer system driven by the A100

amplifier, it may be sonically beneficial to turn the bass boost clockwise to the 18 dB

position, which will emphasize the 45 Hz frequency range output for more „bass punch".

The emphasis at 45 Hz causes a „fatter" bass response, which often creates that extra bit

of fun, depending on the music preferences. By emphasizing the 45 Hz range, the A100 will

also limit a bit earlier, e.g. the distortion-free output is slightly reduced.

5.6 INPUT GAIN

To reach a maximum in dynamic response from each individual head-unit/amplifier/speaker

combination, it is important to set the respective input sensitivity controls („GAIN") of all

channel pairs correctly.

Before you start, you MUST set all tone controls (Bass, Mid, Treble, Loudness etc.) and the

fader on the head unit to their neutral or center positions.

Now turn all input gain controls of the installed amplifiers counter clockwise to their minimum

positions and start with the channel pair, that drives the subwoofer system.

SUBWOOFER CHANNEL(S)

Set the volume control of your head-unit to approximately ¾ of full volume, while playing a

dynamic piece of music. Slowly increase the input gain control of the channel pair driving

the subwoofer(s), by turning the GAIN control clockwise. Increase clockwise until the bass

starts to distort. Reduce the main volume level of your head-unit to a medium listening level.

Proceed with further channels, if applicable.

SATELLITE CHANNELS

Slowly increase the input gain control of the channel pair driving the satellite system, by

turning the GAIN control clockwise. Increase clockwise until you reach a good tonal balance

with a slight emphasis of the bass range. Repeat for all further channels.

FINE TUNING OF ALL CROSSOVER FREQUENCY POINT SETTINGS

Finally you can attempt to fine-tune the HP, and LP crossover frequencies on your amplifier

setup, to reach the maximum tonal balance and channel integration of all loudspeakers

connected to your car audio system. Due to space limitation on A500 side panel, this model

is provided with a selectable fix 70 Hz highpass filter.

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