ARC Audio FD1200.1 Gebruikershandleiding - Pagina 3

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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.

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.

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 adjustment is need to

ensure that all the speakers are playing the

right sounds and that you are left with no

"holes" or low spots in the frequency

response.

Bass Boost

This amp has a fully adjustable bass boost. Both the frequency and the

level of the boost are adjustable. Start with a small increase in the level

control. Then "sweep" the frequency up and down. Listen carefully for an

improvement in the sound of the bass. If you do not hear any improve-

ment then the woofer does not need any boost.

Use Bass Boost carefully. The demands

on power output are tremendous. Try

to minimize the use by changing

woofer position or the enclosure size.

Subsonic Filter

A subsonic filter acts like a crossover but at very low frequencies. It

removes sound that is so low the speaker cannot reproduce it. 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.

Speaker outputs

This amplifier is a mono design. Meaning it has only 1 channel. It is

equipped with a single large block terminal for speaker connection.

Make this connection carefully and neatly. If the wires ever come in

contact with each other the amp will go into protection.

Know your total ohm load before you make any connections.

Note the ohm load switch. Use the 2

ohm position for any load over 2 ohms.

For any load under 2 ohms switch to

the 1 ohm mode.