FUSES
25 X 2
RIGHT
BRIDGED
LEFT
REAR
FRONT
0
15
MIN
MAX
55
250
GAIN
BASS
BOOST
LOW
10
50
SUB
SONIC
R
L
SUB
0
15
MIN
MAX
55
250
GAIN
BASS BOOST
LOW
L
R
POWER/
PROTECT
40
Hz
100
Hz
BOOST FREQ
PHASE
0
0
180
0
SUB
FRONT
REMOTE
0
15
MIN
MAX
55
250
GAIN
BASS
BOOST
LOW
40
Hz
100
Hz
BOOST
FREQ
PHASE
0
0
180
0
10
50
SUB
SONIC
REAR
L
R
GAIN
MIN
MAX
MIN
MAX
GAIN
FRONT
L
R
0
15
MIN
55
25
G
POWER/
PROTECT
40
Hz
100
Hz
REMOTE
SE
0
0
50
SUB
ONIC
REAR
MAX
GAIN
REMOTE
FRONT
LINE OUT
RR
LR
POWER/
PROTECT
FRONT
REAR
L
R
GAIN
BASS BOOST
LOW
HIGH
FULL
55
250
0
15
MIN
MAX
55
250
LOW
HIGH
REAR
LOW
HIGH
FULL
55
250
0
15
MIN
MAX
55
250
GAIN
BASS BOOST
LOW
HIGH
FRONT
L
R
REMOTE
FRONT
RR
LR
POWER/
PROTECT
FRONT
BASS BOOST
0
MAX
REAR
0
15
AX
BASS BOOST
LOW
GH
15
BASS
BOOST
FUSES
25 X 2
3
4
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 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
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
the use by changing woofer position or the
enclosure size.
Speaker outputs
This amplifier is a multi channel amplifier design. Meaning it has more than one
channel of speaker outputs. It is equipped with a large block style terminal for speaker
connection. Make this connection carefully and neatly. Strip your wire back and twist
the exposed leads and insert them into the block terminal while being careful that
there is no loose or frayed strands of wire and
tighten the Allen head screw down on the
terminal till the wire is tightly secured in
place. If the wires ever come in contact with
each other the amplifier will go into protec-
tion.
Know your total ohm load before you
make any connections.
Subsonic Filter
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.
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
up front making the system
sound more like a live perfor-
mance.
