4
| JL Audio - 300/4
v2
Owner’s Manual
5
Power ConneCtions
Before installing the amplifier,
disconnect the negative (ground) wire
from the vehicle’s battery. This will prevent
accidental damage to the system, the vehicle
and your person during installation.
Bridged
Left
Right
+12VDC
Ground Remote
Front Filter Controls
Front Input Section
Front Speaker Outputs
Bridged
Left
Right
Rear Speaker Outputs
Left Ch.
Right Ch.
Filter Freq. (Hz)
Filter Slope
Freq. Range
Input Voltage
Input Sens.
Input Mode
12dB | 24dB
Filter Mode
Off | LP | HP
x1 | x10
Low | High
Rear Input Section
Left Ch.
Right Ch.
Input Voltage
Input Sens.
Low | High
2ch | 4ch
50
60
75
95
130
200
500
300/4
v2
Four-Channel Full-Range Amplifier
Rear Filter Controls
Filter Freq. (Hz)
Filter Slope
Freq. Range
12dB | 24dB
Filter Mode
Off | LP | HP
x1 | x10
50
60
75
95
130
200
500
The 300/4v2’s “+12 VDC” and “Ground”
connections are designed to accept 8 - 4
AWG power wire. 8 AWG is the minimum
recommended power wire size for this amplifier.
If you are installing the 300/4v2 with other
amplifiers and wish to use a single main power
wire, use 2 AWG or 1/0 AWG main power wire
(depending on the overall current demands of
all the amplifiers in the system). This 2 AWG
or 1/0 AWG power wire should terminate into
a distribution block mounted as close to the
amplifiers as possible and should connect to the
300/4v2 with 8 - 4 AWG power wire.
Note: that smaller AWG numbers mean bigger
wire and vice-versa (1/0 AWG is the largest,
2 AWG is smaller, then 4 AWG, then
8 AWG, etc.).
To connect the power wires to the amplifier,
first back out the set screw on the top of the
amplifier, using the supplied 2.5 mm hex
wrench. Strip 1/2 inch (12 mm) of insulation
from the end of each wire and insert the bare
wire into the receptacle on the front panel
of the amplifier, seating it firmly so that no
bare wire is exposed. While holding the wire
in place, tighten the set screw firmly, taking
care not to strip the head of the screw.
The ground connection should be made using
the same gauge wire as the power connection
and should be kept as short as possible, while
accessing a solid piece of sheet metal in the
vehicle. The surface of the sheet metal should
be sanded at the contact point to create a clean,
metal-to-metal connection between the chassis
and the termination of the ground wire. For
optimal grounding, we recommend the use of a
JL Audio ECS master ground lug (XB-MGLU).
Alternatively, a sheet metal screw or bolt can be
used with a star washer.
Any wires run through metal barriers (such as
firewalls), must be protected with a high quality
insulating grommet to prevent damage to the
insulation of the wire. Failure to do so may result
in a dangerous short circuit.
IMPORTANT
!
Many vehicles employ small (10 AWG -
6 AWG) wire to ground the battery to the
vehicle chassis and to connect the alternator’s
positive connection to the battery. To prevent
voltage drops, these wires should be upgraded
to 4 AWG when installing amplifier systems
with main fuse ratings above 60A.
Fuse requirements
It is absolutely vital that the main power
lead to the amplifier(s) in the system be fused
within 18 inches (45 cm) of the positive battery
post connection. The fuse value at each power
wire should be high enough for all of the
equipment being run from that power wire.
If only the 300/4v2 is being run from
that power wire, we recommend a 40A fuse
be used. AGU (big glass fuse), MaxiFuse™
(big plastic-body fuse) or AFS (mini-
blade fuse) types are recommended.
No fuse is required or recommended directly
before the amplifier power connection. If one is
desired, we recommend the use of a 40A AGU,
AFS or MaxiFuse™ type fuse.
ProduCt desCriPtion
The JL Audio 300/4v2 is a four-channel full-
range amplifier utilizing patented Absolute
Symmetry™ Class A/B technology for all
channels. All channels benefit from JL Audio’s
exclusive R.I.P.S. power supply design which
optimizes the output of each channel pair for any
impedance between 1.5 and 4 ohms per channel.
The 300/4v2 can be operated in the
following modes:
1) As a full-system amplifier in bi-amp mode with
one pair of channels driving subwoofers in low-
pass mode (75W x 2 or 150W x 1) and the other
pair of channels driving main speakers in high-
pass mode (75W x 2).
2) As a four-channel satellite amplifier in a
bi-amplified system, delivering high-passed
signals to front and rear speaker systems.
The 300/4v2’s flexible input and crossover
sections permit operation with a wide variety
of source units and system configurations. The
300/4v2 can operate with a single pair of stereo
inputs or with separate inputs for front and rear
channels, if the source unit is equipped with front
and rear outputs.
tYPiCal installation sequenCe
The following represents the sequence
for a typical amplifier installation, using an
aftermarket source unit or OEM Interface
processor (like the CleanSweep® CL441dsp).
Additional steps and different procedures may
be required in some applications. If you have
any questions, please contact your authorized
JL Audio dealer for assistance.
1) Disconnect the negative battery post
connection and secure the disconnected cable
to prevent accidental re-connection during
installation. This step is not optional!
2) Run power wire (minimum 8 AWG)
from the battery location to the amplifier
mounting location, taking care to
route it in such a way that it will not be
damaged and will not interfere with
vehicle operation. Use 2 AWG or 1/0
AWG power wire if additional amplifiers
are being installed with the 300/4v2.
3) Connect power wire to the positive battery
post. Fuse the wire with an appropriate fuse
block (and connectors) within 18 inches (45
cm) wire length of the positive battery post.
This fuse is essential to protect the vehicle. Do
not install the fuse until the power wire has
been connected to the amplifier.
4) Run signal cables (RCA cables) and remote
turn-on wire from the source unit to the
amplifier mounting location.
5) Run speaker wire from the speaker systems to
the amplifier mounting location.
6) Find a good, solid metal grounding point close
to the amplifier and connect the negative power
wire to it using appropriate hardware. Use
minimum 8 AWG power wire, no longer than
36 inches (90 cm) from the amplifier to the
ground connection point. In some vehicles, it
may be necessary to upgrade the battery ground
wire. (See page 5 for important notice).
7) Securely mount the amplifier using
appropriate hardware.
8) Connect the positive and negative power
wires to the amplifier. A fuse near the
amplifier is not necessary.
9) Connect the remote turn-on wire
to the amplifier.
10) Connect the RCA input cables
to the amplifier.
11) Connect the speaker wires to the amplifier.
12) Carefully review the amplifier’s control
settings to make sure that they are set
according to the needs of the system.
13) Install power wire fuse (40A for a
single 300/4v2) and reconnect the negative
battery post terminal.
14) Turn on the source unit at a low level
to double-check that the amplifier is
configured correctly. Resist the temptation
to crank it up until you have verified the
control settings.
15) Make necessary adjustments to the input
sensitivity controls to obtain the right
overall output and the desired balance
in the system. See Appendix A (page 14)
for the recommended input sensitivity
setting method.
16) Enjoy the fruits of your labor with your
favorite music.