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JL Audio MX300 Anleitung

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Thank you for purchasing a JL Audio amplifier for
your sound system.
Your amplifier has been designed and manufactured to exacting
standards in order to ensure years of musical enjoyment. For maximum
performance, we highly recommend that you have
your new amplifier installed by an authorized JL Audio dealer. Your
authorized dealer has the training, expertise and installation equipment
to ensure optimum performance from this product. Should you
decide to install the amplifier yourself, please take the time
to read this manual thoroughly to familiarize yourself
with its installation requirements and setup procedures.
If you have any questions regarding the instructions in this
manual or any aspect of your amplifier’s operation, please contact your
authorized JL Audio dealer for assistance. If you need further assistance,
please call the JL Audio Technical Support Department
at technical@jlaudio.com or call (954) 443–1100 during business hours.
OWNER’S MANUAL
300W Wide-Range Class D Monoblock Amplier
What’s Included
(1) Amplifier
(4) Stainless steel mounting screws
(1) Spare 30A fuse
(1) User manual
Product Description
This is a wide-range monoblock amplifier utilizing Class D technology that can
be used alone or in stereo pairs.
Installation Applications
This amplifier is designed for operation with 12 volt, negative-ground electrical
systems. Using this product in systems with positive ground and/or voltages
other than 12V may result in damage to the product and will void the warranty.
This product is not certified or approved for use in aircraft.
Safety Considerations
• Whenever possible, mount the amplifier in a dry, well-ventilated location
that does not interfere with other factory installed electronic devices. If a dry
environment is not available, a location that is not exposed to heavy splashing
may be used.
• While this amplifier is designed to be water-resistant, it should never be
submerged under water or subjected to high-pressure water spray. Do not
install where it will be directly exposed to the elements.
• Do not mount the amplifier in the engine compartment or in any areas of
extreme heat.
• Securely mount the amplifier so that it does not come loose in the event of
a collision/sudden jolt or as a result of repeated vibrations during normal
operation.
• Check before drilling to make sure that you will not be drilling into an exterior
panel/hull, fuel tank, gas/brake line, wiring harness, or other vital system.
• Do not run system wiring outside or underneath the vehicle/vessel. This is an
extremely dangerous practice, which can result in severe damage/injury.
• Protect all system wires from sharp edges (metal, fiberglass, etc.) by carefully
routing them, tying them down and using grommets and loom where
appropriate.
• Secure all wiring as needed, using cable ties or wire clamps to protect them
from moving parts and sharp edges.
Installation Procedure/Connections
1. Disconnect the NEGATIVE battery post connection and secure the discon-
nected cable to prevent accidental reconnection during installation. This is
an essential safety precaution during installation!
2. Connect the RED power lead to the positive (+12V) battery post. 8 AWG is
the minimum power wire size for this amplifier.
3. An appropriate fuse at the main power wire(s) to the amplifier(s) is vital for
vehicle/vessel safety. This fuse must be installed within 18 inches (45 cm) of
the positive battery post connection. If this is the only device connected to
this main wire, use a 30A fuse. Do not install the fuse until the power wire
has been securely connected to the amplifier.
4. Connect the BLACK negative ground lead to a clean, solid metal grounding
point near the amplifier. This can be to metal chassis ground, if available. If
no metal chassis ground is available, it may be necessary to make this con-
nection to the NEGATIVE battery post. 8 AWG is the minimum ground wire
size for this amplifier. All ground connections (source unit and amplifi-
ers) should be made at the same location.
5. Connect the BLUE remote turn-on lead to the source unit’s positive (+12V)
remote turn-on output. If your source unit does not have a dedicated
remote turn-on output, the amplifier’s turn-on lead can be connected to
+12V via a switch that derives power from an ignition-switched circuit.
6. Signal Input (Low-Level): Connect the amplifier’s RCA input jacks to the
source unit’s preamp level output jacks. You may run a stereo or a mono
signal into the inputs of the amplifier. The amplifier’s input section automat-
ically sums stereo signals to mono for the internal amplifier section. When
feeding a single, low-level RCA input connection, use a Y-adaptor splitter to
split the mono signal and connect it to both Left and Right RCA inputs.
7. Signal Input (Hi-Level): If your source unit does not offer preamp level signal
outputs, you can splice the speaker output wires of the source unit onto a
pair of RCA plugs for the input pair or use the JL Audio ECS Speaker Wire
to RCA adaptor (XD-CLRAIC2-SW). Make sure to observe correct polarity in
making “Hi-Level Input” connections. Failure to do so will result in a loss of
signal (poor performance).
8. Connect the speaker output leads to the corresponding speaker wires.
9. Make necessary adjustments to the filter controls and input sensitivity.
10. The amplifier’s subwoofer output level can be controlled from the front of
the vehicle/vessel with an optional remote level controller (sold separately).
Use the RBC-1 for standard (dry) installations or the M-RBC-1 for applica-
tions exposed to moisture. Connect the remote’s plug to the amplifier’s har-
ness-mounted RJ11 input jack. (Refer to Appendix B)
WARNING! Failure to make safe, tight, high-integrity power connec-
tions can result in fire and extensive damage!
Control Panel Settings and Adjustments
The amplifier’s settings and controls are located on the bottom panel beneath a
gasketed, protective cover. Remove the four Phillips head screws from the center
panel to access the controls and make adjustments. Replace cover when finished
and mount the amplifier.
IPX6
WATER
RESISTANT
Label Wire Color Description
+12V Red Positive (+12V) Power Connection
GND Black Negative (GND) Ground Connection
REM Blue Positive (+12V) Remote Turn-On Input
SPK+ Lt. Blue Positive (+) Speaker Output
SPK– Lt. Blue/Black Negative (–) Speaker Output
Plug Description
White RCA Left Channel Signal Input
Red RCA Right Channel Signal Input
Remote Bass Control Jack RJ11 Input Jack for M-RBC-1 (sold separately)
Connections
Switch Setting Mode / Function
Input Voltage
Low RCA/Preamp Level Range (250 mV - 4 V)
High RCA/Preamp or Speaker Level Range (750 mV - 15 V)
Input Sens. Variable
Adjusts the input stage of the amplifier channels to
match the source unit’s output voltage for maximum
clean output (refer to Appendix A)
LP Filter
Off
Full-Range Operation of Input Signals /
Defeats M-RBC-1 & Infrasonic Filter
On
Low-Pass: Configures Filter to Attenuate Frequencies
ABOVE the Selected Filter Frequency
LP Filter
Freq.
Variable
Adjusts the low-pass filter cutoff frequency,
variable from 40-400 Hz, 24 dB/Octave
Infrasonic
Filter
Variable
Adjusts the high-pass filter cutoff frequency,
variable from 20-40 Hz, 12 dB/Octave
Bass Boost Variable
Boost-Only Bass Equalizer: Boost range from 0dB
(full-counterclockwise) to +12dB (full-clockwise),
centered at 43 Hz. (always active)
Output
Polarity
0 Normal speaker polarity
180 deg. Polarity reversed 180 degrees
Speaker
M-RBC-1 (Sold Separately)
High <or> Low-Level Inputs
(selectable via Input Voltage Switch)
30A
Battery
Remote Bass Control Jack
Remote Turn-On
Source
[REM]
[SPK–]
[SPK+]
[+12V]
[GND]
1

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