JL AUDIO XDM300-1 300W Mono ClasS D Subwoofer Amplifier Owner’s Manual
- June 9, 2024
- JL AUDIO
Table of Contents
XDM300-1
300W MONO CLASS D SUBWOOFER AMPLIFIER
OWNER’S MANUAL
XDM300-1 300W Mono ClasS D Subwoofer Amplifier
INSTALLATION CONSIDERATIONS
- Installation requires appropriate tools and safety equipment. Professional installation is recommended.
- This product is water-resistant. Do not submerge or subject to high-pressure water spray.
- Before installation, turn off the audio system and disconnect the battery system from the audio system.
- When possible, install in a dry, well-ventilated location that does not interfere with factoryinstalled systems. If a dry environment is not available, a location that is not exposed to heavy splashing may be used.
- Do not install in the engine compartment, any areas of extreme heat or where it will be directly exposed to the elements.
- Before cutting or drilling, check for potential obstacles behind mounting surfaces.
- Carefully route all system wiring away moving parts and sharp edges; secure with cable ties or wire clamps and use grommets and loom where appropriate to protect from sharp edges.
SAFETY CONSIDERATIONS
- Only use this product with 12 volt, negativeground electrical systems. This product is not certified or approved for use in aircraft.
- Mount this product securely to prevent damage or injury in severe conditions.
- An appropriate fuse (or circuit breaker) at the main power wire is vital for vehicle/vessel safety and must be installed within 18 inches (45 cm) of the positive battery connection.
- For ABYC and NMEA applications, circuit protection is required within 7 inches (18 cm) of the battery, unless the cable is in an enclosure or conduit.
- Listen to your audio system at levels appropriate for operating conditions and hearing safety.
CONNECTIONS
| 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 6 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
• Unaffected by the amplifier’s LP filter
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 Unaffected
• Multiple amplifiers 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
CONTROLS
| Control (Function)| Setting| Description
---|---|---|---
5| Status LED
(indicates operating status)| Flashing Green| ** Amplifier 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 Off| Amplifier Turns Off (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
(configures 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
Offset| DC Offset-Sensing (Automatic)
• Turns On by detecting the presence of small DC signal in OEM audio outputs
and turns Off after the signal is removed| • Designed for high-level (speaker)
signals only
• Detects input signal from CH. 1 (L) only
• Using DC Offset 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
(configures input filter 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 amplifier’s inputs. See Appendix A for detailed
information.
LP Filter Mode/Slope
(configures the low-pass filter and slope)| Off| 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 filter cutoff frequency)| Variable| Use to adjust
the cutoff frequency of the low-pass active filter, from 50 Hz – 500 Hz / 12dB
per octave
APPENDIX A: Input Sensitivity Level Setting
Follow the steps below to adjust the input sensitivity of each amplifier
channel pair to achieve overall system balance.
Necessary Equipment
-
Digital AC Voltmeter
-
Sine-wave test tone recorded at 0 dBfs reference level in the frequency range to be amplified.
Do not use attenuated test tones (-10 dB, -20 dB, etc.).
Full range channel/amplifier applications: 1 kHz
Subwoofer channel/amplifier applications: 50 Hz -
Depending on your type of source unit, the sine-wave may be played via a CD, USB thumb drive, portable media player or Bluetooth® audio source. Make sure to disable any EQ/DSP modes on your portable media player during level setting.
The Nine-Step Procedure
-
Disconnect the speaker(s) from the amplifier’s speaker output connectors.
-
Turn off all processing (bass/treble, loudness, EQ, etc.) on the source unit, processors (if used) and amplifier.
Set the fader control to center position and the subwoofer level control to 3/4 of maximum, if used. -
Turn the “Input Sens.” control all the way down.
-
Set the source unit volume to 3/4 of full volume. This will allow for reasonable gain overlap with moderate clipping at full volume.
-
Using the chart below, determine the target voltage for input sensitivity adjustment according to the nominal impedance of the speaker system connected to the amplifier outputs.
-
Verify that you have disconnected the speakers before proceeding. Play a track with an appropriate sine wave (within the frequency range to be amplified) at 3/4 source unit volume.
-
Connect the AC voltmeter to the speaker output terminals of the amplifier.
Make sure to test the voltage at the correct terminals (+ and –). -
Increase the “Input Sens.” control until the target voltage is observed with the voltmeter.
-
Once you have adjusted each channel section to its maximum low-distortion output level, reconnect the speaker(s). The “Input Sens.” controls can now be adjusted downward if the amplifier requires attenuation to achieve the desired system balance.
IMPORTANT!
-
Do not increase any “Input Sens.” setting for any amplifier channel or channel pair in the system beyond the maximum level established during this procedure.
Doing so will result in audible distortion and possible speaker damage. -
It will be necessary to re-adjust the “Input Sens.” if any equalizer boost is activated after setting the “Input Sens.” with this procedure. This applies to any EQ boost circuit, including source unit tone controls or EQ circuits. EQ cuts will not require re-adjustment.
| Nominal Impedance | Target AC Voltage |
|---|---|
| 4Ω | 28.3 V |
| 3Ω | 27.4 V |
| 2Ω | 24.5 V |
| 1Ω | not recommended |
SPECIFICATIONS
Amplifier Section
Amplifier Topology| NexD™ Ultra-High Speed Class D
Power Supply Type| Unregulated MOSFET Switching
Minimum Copper Power/GND Wire| 4 AWG
(Note: CCA/Copper Clad Aluminum wire is not recommended.)
Recommended Fuse| 30 A
Rated RMS Power @ 14.4V, <1% THD+N| 200W x 1 @ 4 Ω| 250W x 1 @ 3 Ω| 300W x 1@
2 Ω
Rated RMS Power @ 12.5V, <1% THD+N| 160W x 1 @ 4 Ω| 210W x 1 @ 3 Ω| 270W x 1@
2 Ω
Frequency Response| 1 Hz – 1 kHz (+0, -1dB)
S/N Ratio
(A-weighted, 20 Hz–20 kHz noise bandwidth)| 100 dB (Referred to rated power),
80 dB (Referred to 1 W)
Damping Factor| >120 / 50 Hz @ 4 Ω, >60 / 50 Hz @ 2 Ω
Input Section
Number of Inputs| 2 (One Stereo Pair)
Input Type| Differential-Balanced with RCA jack inputs
Input Voltage Range| 200mV – 4V RMS
Signal Processing
Filter Type| Active, 12dB or 24dB/octave Low-Pass, (50 – 500 Hz), defeatable
Remote Level Control| HD-RLC or MHD-RLC (optional). Full mute to 0 dB range.
Dimensions
L x W x H| 6.85 in. x 7.09 in. x 2.05 in. (174 mm x 180 mm x 52 mm)
Due to ongoing product development, all specifications are subject to change without notice.
JL Audio® – XDM300/1
Printed in China
MAN-05272022
Documents / Resources
| JL
AUDIO XDM300-1 300W Mono ClasS D Subwoofer
Amplifier
[pdf] Owner's Manual
XDM300-1, 300W Mono ClasS D Subwoofer Amplifier, Subwoofer Amplifier, 300W
Mono ClasS D Amplifier, ClasS D Amplifier, Amplifier
---|---
| JL
AUDIO XDM300-1 300W Mono Class D Subwoofer
Amplifier
[pdf] Owner's Manual
XDM300-1 300W Mono Class D Subwoofer Amplifier, XDM300-1, 300W Mono Class D
Subwoofer Amplifier, Mono Class D Subwoofer Amplifier, Class D Subwoofer
Amplifier, Subwoofer Amplifier, Amplifier
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>