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4 | JL Audio® - XDM300/1
5
Connection Description Notes
1
+12 VDC Positive (+12V) Power Connection
• 4 AWG wire (8 AWG minimum)
• Install 30A fuse at (+) battery post
Ground Negative (GND) Ground Connection • 4 AWG wire (required)
Remote Positive (+12V) Activation Connection
• 18 – 12 AWG wire capacity
• See Turn On Mode for more info
2
CH. 1 Input Left Input Signal, Black RCA
• Accepts 200mV – 4V input voltage
• If only one subwoofer channel signal is
available, a Y-adaptor is recommended
to feed both inputs.
CH. 2 Input Right Input Signal, Red RCA
Preout 1 Left Pass-Through Preamp Signal, Black RCA
• Same signal that is connected to
CH. 1&2 inputs
• Unaected by the amplier’s LP lter
Preout 2 Right Pass-Through Preamp Signal, Red RCA
3
Remote Level
Control
Remote Level Controller Connection (optional)
(HD-RLC or MHD-RLC)
• Operates as an attenuator only:
Fully counter-clockwise = Level Muted
Fully clockwise = Level Unaected
• Multiple ampliers can be controlled
from a single HD-RLC using a non-
duplex phone line splitter and multiple
phone cables.
4
Mono
Subwoofer
Output
(+) Positive Subwoofer Output
• Both positive (+) connections are con-
nected in parallel internally
• Both negative (–) connections are con-
nected in parallel internally
• Minimum impedance load: ≥2 ohms
• 16 – 8 AWG wire capacity
(+) Positive Subwoofer Output
(–) Negative Subwoofer Output
(–) Negative Subwoofer Output
CONNECTIONS
Control (Function) Setting Description
5
Status LED
(indicates operating
status)
Flashing
Green
Amplier Powering Up, Audio Output Muted
Green On-Normal Operation, Active Audio Output
Red
On-Safe Mode, Over-Temperature Condition, Audio Output Reduced
• Reverts to normal operation when temperature returns to a safe level
Amber
(yellow)
On-Safe Mode, Over-Current Condition, Audio Output Muted
• May exhibit repetitive, audible ticking or thumping noise in the output
• Inspect for speaker/wire short circuit or low impedance
LEDs O
Amplier Turns O (unexpectedly), Low-Voltage Condition
• Occurs when battery or remote turn-on voltage drops below 10V
• Reverts to normal operation when voltage rises above 11V
6
Turn On Mode
(congures
activation method)
Remote
+12V Remote Turn-On (Preferred)
• Controlled by a switched +12V circuit or turn-on out-
put of your source unit/OEM interface
Oset
DC Oset-Sensing (Automatic)
• Turns On by detecting the presence of small DC
signal in OEM audio outputs and turns O after
the signal is removed
• Designed for high-level
(speaker) signals only
• Detects input signal from
CH. 1 (L) only
• Using DC Oset or Signal
Sensing methods will turn the
“Remote” terminal into a +12V
turn-on output.
Signal
Signal-Sensing (Automatic)
• Turns On by detecting full-range OEM audio
signals and turns OFF after the signal is removed
(within 30 seconds)
Input Filter
(congures input
lter application)
Car Select for most installations (automotive or marine)
Boat Select if experiencing interference from high-current mechanical switches/devices
7
Input Sens.
(adjusts the
input stage)
Variable
Use to match the source unit’s output voltage with the amplier’s inputs.
See Appendix A for detailed information.
LP Filter Mode/Slope
(congures the
low-pass lter
and slope)
O Filter defeated; passes full range of frequencies present at the inputs
12dB Attentuates frequencies above the “Filter Freq. (Hz)” dial, at a rate of 12dB/octave
24dB Attentuates frequencies above the “Filter Freq. (Hz)” dial, at a rate of 24dB/octave
Filter Freq. (Hz)
(adjusts the low-
pass lter cuto
frequency)
Variable
Use to adjust the cuto frequency of the low-pass active lter,
from 50 Hz – 500 Hz / 12dB per octave
CONTROLS
1 2 3 4
5
6 7
EN
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