Input Section
Because of the wide range of head unit output configurations all ARC Audio amplifiers have an adjustable input sensitivity or “Gain”. The gain is not a volume or a power limiting control like a throttle. It makes the amp more sensitive to input from the stereo. With the gain up the amp will reach full output at a lower volume setting on the deck. At higher gain settings the amp also becomes more sensitive to noise from the car’s electrical system. Try to run the gain at the lowest setting possible for you system.
Bass Boost cont.
The XDi amplifier feature a Quasi Parametric Bass EQ Bass Boost with adjustments for both Boost Level and Boost Frequency. Begin your adjustments at low volume. Turn the Bass Boost Level control about 1/2 way up. Next, turn the Bass Boost Frequency up and down. This will take some tweaking but try to find the setting that gives you a richer and fuller sound without over working the subwoofer. Play several different kinds of music to test your adjustment You may find you
There is no correct gain setting. Because speakers require different power demands to reach the same output, the gains most often need to be used to compensate for these differences. If you tried to set all the gains at half way you would probably find the system didn’t sound very good. Using good judgment and listening carefully to each speaker is still the best way to tune a system.
GAIN
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have to go back and make some changes and compromises to get it sounding right with an assortment of music. Use Bass Boost carefully. The demands on power output are tremendous. Try to minimize
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the use by changing woofer position or theGAIN | SUBB | LOW | BASS | BOOST | PHASSEE |
enclosure size. | SONICNIC |
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Subsonic Filter
Crossover Controls
A crossover is a device that removes unwanted frequencies from a speaker or amplifier. A tweeter can easily be destroyed by bass notes if they are not filtered out. Likewise a subwoofer will not sound natural if it is playing midrange notes. A crossover removes these sounds from
the speaker. As you might guess, careful
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speakers are playing the right sounds |
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and that you are left with no “holes” or |
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low spots in the frequency response. |
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Phase Shift Control
"Timing is everything". In a typical stereo installation the mid bass speakers are in the front of the car between 3 to 5 feet from you ear. The sub woofer is all the way in the back, 9 to 12 feet way. Sometimes more. The Phase control can be used to compen- sate for this difference in
distance by causing the sound
from both speakers to arrive at your ear at the same time. This
can really help bring the bass
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sound more like a live perfor- |
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mance. |
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A Subsonic filter acts like a crossover but at very low frequencies. It removes sounds that are so low in frequency that the speaker cannot reproduce them. You see the cone moving but hear no sound. This can be
very hard on your woofer especially at high power. If you are using a ported subwoofer enclosure at high power you should use a Subsonic Filter to limit cone movement at very low frequencies.
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This amplifier is a multi channel amplifier design. Meaning it has more than one |
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channel of speaker outputs. It is equipped with a large block style terminal for speaker |
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connection. Make this connection carefully and neatly. Strip your wire back and twist |
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the exposed leads and insert them into the block terminal while being careful that |
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there is no loose or frayed strands of wire and |
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tighten the Allen head screw down on the |
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terminal till the wire is tightly secured in |
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place. If the wires ever come in contact with |
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each other the amplifier will go into protec- |
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tion. |
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make any connections. |
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3 | 4 |
