ARC Audio 4000se Manuel et mode d'emploi - Page 5
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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.
Getting Access to Your Controls
The crossover and gain controls are located under the top plate on
top of the amp. You must first remove the 4 attaching screws that
hold the plate in place. Put them and the plate in a safe place for
later.
When you have made all your adjustments replace the plate. You
may wish to rotate it so the logo faces the desired direction.
Now all your controls are safe from dirt and accidental changes.
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 Do Not attempted to run loads below 1 ohm.
GAIN
INPUT
OUT
SLAVE IN
L
BALANCED
BALANCED
REMOTE
RS232
IN
OUT
LEVEL
PORT
R
SLAVE OUT
Warning: The voltage at the speaker terminal on the 4000se can be
high enough to be dangerous. Use caution when working with any
speaker connection on the 4000se.
This Amplifier is equipped with a Speaker terminal cover
interrupter. If the terminal cover
is removed the unit will shut
down and will display a code 11
(1 flash followed a second later
by 1 flash) on the logo and
remote level control LED. It will
not turn back on until The cover
has been replaced.
The Robert Zeff Signature Edition incorporates a highly advanced
audiophile crossover. The 4000se is equiped with a fully adjustable
Low Pass crossover with either 12dB or 24dB slope.
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.
Crossover Slope
The 12dB/24dB switch is used adjust how fast the crossover
removes unwanted frequencies. 24dB will filter out sound twice as
fast. EXAMPLE: You set a LOW PASS crossover at 50Hz using the
12dB mode. At 1 octave above the
crossover point the sound will be
12db quieter. By adjusting the slope
you can change it to 24dB quieter.
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 improvement 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.
CROSSOVER
24dB
30
12dB
SLOPE
250
FREQ
Hz
CROSSOVER
24dB
12dB
SLOPE
BASS BOOST
0
20
15
80
BOOST
FREQ
dB
Hz
SUBSONIC FILTER
10
ON
80
FREQ
Hz
OFF
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