Page 4
Input Section
X2 Series Monoblock amplifiers are equipped with balanced
differential input stages that are compatible with any analogue
source including Balanced and Unbalanced RCA, Common
ground speaker level output and Bridged Tied Load (BTL)
outputs common to many OEM head units. The RCA pigtails
included with these amplifiers are intended to be used with
the speaker-level outputs of a radio or amplifier. These pigtails
include a divider network molded into the RCA end that
reduces the voltage of the signal from the source. If you are
integrating into an OEM system with balanced or common
ground line-level signals you should not use these Pigtails.
In this case it is recommended that you use an appropriate RCA cable with one set of ends removed as inputs for the
amplifier.
Gain / Sensitivity Controls
Because of the wide range of head unit output configurations
available, all ARC Audio amplifiers have an adjustable input
sensitivity or “Gain” control. The gain is not a volume or a
power limiting control like a throttle. It makes the amp more
sensitive to input from the source. With the gain up the amp
will reach full output at a lower volume setting on the deck
and 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. As different size and shape speakers require different amounts of power to reach the
same output, the gain settings need to be adjusted to compensate for these speaker efficiency differences. If you tried to
set all the gains at half way you would probably find the system didn’t sound very good. Use good judgment and optimize
each channel carefully as you configure the system. You want to set the gains to maximize the output of the amplifier,
while producing minimal distortion for your given source unit and music selection.
Crossover Control
A crossover is a circuit that limits what frequencies are
produced by the amplifier, and subsequently, the speaker(s)
connected to the amp. A tweeter can be destroyed by bass
information. Those frequencies need to be filtered for proper
operation. Likewise, a subwoofer will not sound natural if it
is playing midrange frequencies. A crossover removes these
sounds from the signal going to the speaker. As you might
guess, careful adjustment is required to ensure that all the
speakers are playing in the correct frequency range and that
the net frequency response of the total system is smooth with
no over- or under-lap.
The X2 Series Monoblock amplifiers include Low-Pass crossover that is adjustable from 30Hz to 230Hz.
Subsonic Control
Functioning in a similar fashion to the Low-Pass crossover
found on all X2 Series monoblock amplifiers, all three
amplifiers include an adjustable high-pass filter that can
be used to block infrasonic frequencies from being passed
through to your subwoofers.
Given the power available from the X2 Series Monoblock
amplifiers, it is advisable to configure the Subsonic filter to
protect your subwoofers from over-excursion when used in
bass-reflex (ported) subwoofer enclosures.
20.92 [531,35mm]
XDi 2500.1 REV 2.04
CROSSOVER
FREQ Hz
OFF
DC
DETECT
SIGNAL
DETECT
SLAVE IN
SLAVE OUT
SUB
1
Ω
MIN
FUSE 40 AMP X 6
+12
V
GND
TURN ON
INPUT
REMOTE
LEVEL
DO NOT BRIDGE
OR STRAP
X2 2500
.1
20.92 [531,35mm]
XDi 2500.1 REV 2.04
CROSSOVER
FREQ Hz
OFF
DC
DETECT
SIGNAL
DETECT
SLAVE IN
SLAVE OUT
SUB
1
Ω
MIN
FUSE 40 AMP X 6
+12
V
GND
TURN ON
INPUT
REMOTE
LEVEL
DO NOT BRIDGE
OR STRAP
X2 2500
.1
20.92 [531,35mm]
XDi 2500.1 REV 2.04
CROSSOVER
FREQ Hz
OFF
DC
DETECT
SIGNAL
DETECT
SLAVE IN
SLAVE OUT
SUB
1
Ω
MIN
FUSE 40 AMP X 6
+12
V
GND
TURN ON
INPUT
REMOTE
LEVEL
DO NOT BRIDGE
OR STRAP
X2 2500
.1
20.92 [531,35mm]
XDi 2500.1 REV 2.04
CROSSOVER
FREQ Hz
OFF
DC
DETECT
SIGNAL
DETECT
SLAVE IN
SLAVE OUT
SUB
1
Ω
MIN
FUSE 40 AMP X 6
+12
V
GND
TURN ON
INPUT
REMOTE
LEVEL
DO NOT BRIDGE
OR STRAP
X2 2500
.1
