JL Audio XDM8008 8 Channel Class D Full-Range Car/Marine Amplifier User Manual
- June 9, 2024
- JL AUDIO
Table of Contents
JL Audio XDM8008 8 Channel Class D Full-Range CarMarine Amplifier
PARTS
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 factory installed 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, negative round 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 (required)
- Install 80A 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
- See Input Mode for more info
CH. 2 Input| Right Input Signal, Red RCA
CH. 3 Input| Left Input Signal, Black RCA
CH. 4 Input| Right Input Signal, Red RCA
CH. 5 Input| Left Input Signal, Black RCA
CH. 6 Input| Right Input Signal, Red RCA
CH. 7 Input| Left Input Signal, Black RCA
CH. 8 Input| Right Input 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
4| CH. 1 (L) Speaker Output| | (+) Positive Speaker Output| CH. 1&2 Bridged (+)|
- Minimum impedance load: Stereo mode ≥2 ohms Bridged mode ≥4 ohms
- 16 – 8 AWG wire capacity
| (–) Negative Speaker Output
CH. 2 (R) Speaker Output| | (+) Positive Speaker Output
| (–) Negative Speaker Output| CH. 1&2 Bridged (–)
CH. 3 (L) Speaker Output| | (+) Positive Speaker Output| CH. 3&4 Bridged (+)
| (–) Negative Speaker Output
CH. 4 (R) Speaker Output| | (+) Positive Speaker Output
| (–) Negative Speaker Output| CH. 3&4 Bridged (–)
CH. 5 (L) Speaker Output| | (+) Positive Speaker Output| CH. 5&6 Bridged
(+)
| (–) Negative Speaker Output
CH. 6 (R) Speaker Output| | (+) Positive Speaker Output
| (–) Negative Speaker Output| CH. 5&6 Bridged (–)
CH. 7 (L) Speaker Output| | (+) Positive Speaker Output| CH. 7&8 Bridged (+)
| (–) Negative Speaker Output
CH. 8 (R) Speaker Output| | (+) Positive Speaker Output
| (–) Negative Speaker Output| CH. 7&8 Bridged (–)
| 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 output 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
Input Mode (configures input signal connections)| 2 Ch.| Select when
using CH. 1&2 inputs only
- CH. 3, 5 & 7 will operate with CH. 1 signal
- CH. 4, 6 & 8 will operate with CH. 2 signal
4 Ch.| Select when using CH. 1&2 and CH. 5&6 inputs
- CH. 3 will operate with CH. 1 signal
- CH. 4 will operate with CH. 2 signal
- CH. 7 will operate with CH. 5 signal
- CH. 8 will operate with CH. 6 signal
8 Ch.| Select when using all eight inputs
Remote Level Mode (configures HD-RLC operation – optional)| All| Adjusts
level of all channels equally|
- Multiple amplifiers can be controlled from a single HD-RLC using a non- duplex phone line splitter and multiple phone cables.
5 – 8| Adjusts level of channels 5, 6, 7 & 8 only
7 & 8| Adjusts level of channels 7 & 8 only
| Control (Function) | Setting | Description | |
|---|---|---|---|
| 7 | Input Sens. adjusts each channel pair’s input stage) | Variable | Use to |
match the source unit’s output voltage with the inputs of each pair of
amplifier channels. See Appendix A for detailed information.
CH. 1&2| Filter Mode (configures the filter of CH. 1&2)| Off| Filter
defeated; passes full range of frequencies present at the inputs
HP| Attenuates frequencies below the CH. 1&2 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
LP| Attenuates frequencies above the CH. 1&2 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
Filter Freq. (Hz) (adjusts filter cutoff frequency)| Variable| Use to
adjust the cutoff frequency of channel 1&2’s active filter, from 50 Hz – 500
Hz / 12dB per octave
CH. 3&4| Filter Mode (configures the filter of CH. 3&4)| Off| Filter
defeated; passes full range of frequencies present at the inputs
HP| Attenuates frequencies below the CH. 3&4 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
LP| Attenuates frequencies above the CH. 3&4 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
Filter Freq. (Hz) (adjusts filter cutoff frequency)| Variable| Use to
adjust the cutoff frequency of channel 3&4’s active filter, from 50 Hz – 500
Hz / 12dB per octave
CH. 5&6| Filter Mode (configures the filter of CH. 5&6)| Off| Filter
defeated; passes full range of frequencies present at the inputs
HP| Attenuates frequencies below the CH. 5&6 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
LP| Attenuates frequencies above the CH. 5&6 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
Filter Freq. (Hz) (adjusts filter cutoff frequency)| Variable| Use to
adjust the cutoff frequency of channel 5&6’s active filter, from 50 Hz – 500
Hz / 12dB per octave
CH. 7&8| Filter Mode (configures the filter of CH. 7&8)| Off| Filter
defeated; passes full range of frequencies present at the inputs
HP| Attenuates frequencies below the CH. 7&8 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
LP| Attenuates frequencies above the CH. 7&8 “Filter Freq. (Hz)” dial, at a
rate of 12dB/octave
Filter Freq. (Hz) (adjusts filter cutoff frequency)| Variable| Use to
adjust the cutoff frequency of channel 7&8’s 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 dBs 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
1. Disconnect the speaker(s) from the amplifier’s speaker output connectors.
2. 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.
3. Turn all “Input Sens.” controls all the way down.
4. Set the source unit volume to 3/4 of full volume. This will allow for
reasonable gain overlap with moderate clipping at full volume.
5. 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.
6. 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.
7. Connect the AC voltmeter to the speaker output terminals of the amplifier.
If the channel pair is operating in stereo, it is only necessary to measure
one channel. If bridged, make sure you test the voltage at the correct
terminals (L+ and R–).
8. Increase the “ Input Sens. ” control until the target voltage is
observed with the voltmeter.
9. 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 |
|---|---|
| Stereo | Bridged |
| 8Ω | 17.3 V |
| 4Ω | 17.3 V |
| 3Ω | 16.0 V |
| 2Ω | 14.1 V |
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| 80 A
** Rated RMS Power @ 14.4V, <1% THD+N| 75W x 8 @ 4 Ω| 100W x 8 @ 2 Ω
150W x 4 @ 8 Ω Bridged| 200W x 4 @ 4 Ω Bridged
Rated RMS Power @ 12.5V,
<1% THD+N| 60W x 8 @ 4 Ω| 90W x 8 @ 2 Ω
120W x 4 @ 8 Ω Bridged| 180W x 4 @ 4 Ω Bridged
Frequency Response| 12 Hz – 22 kHz (+0, -1dB)
S/N Ratio (A-weighted, 20 Hz–20 kHz noise bandwidth)| >104 dB (Referred to
rated power), >84 dB (Referred to 1W)
Damping Factor| >150 / 50 Hz @ 4 Ω, >75 / 50 Hz @ 2 Ω
Input Section
Number of Inputs| 8 (Four Stereo Pairs)
Input Type| Differential-Balanced with RCA jack inputs
Input Voltage Range| 200mV – 4V RMS
Signal Processing
Filter Type| CH. 1&2| CH. 3&4| CH. 5&6| CH. 7&8
Active, 12dB/octave, High-Pass or Low-Pass (50 – 500 Hz), defeat able
Remote Level Control| HD-RLC or MHD-RLC (optional). Full mute to 0 dB range.
Dimensions**
L x W x H| 14.73 in. x 7.09 in. x 2.05 in. (374 mm x 180 mm x 52 mm)
Due to ongoing product development, all specifications are subject to change without notice.
