Jl Audio Xdm8008 8 Channel Class D Full-range Car/marine Amplifier User Manual (+ PDF)

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JL Audio XDM8008 8 Channel Class D Full-Range CarMarine Amplifier

Contents hide

1 PARTS

2 INSTALLATION CONSIDERATIONS

3 SAFETY CONSIDERATIONS

4 CONNECTIONS

5 APPENDIX A

5.1 Input Sensitivity Level Setting

6 SPECIFICATIONS

7 Documents / Resources

8 Related Posts

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
Nominal Impedance	Stereo	Bridged
8Ω	17.3 V	34.6 V
4Ω	17.3 V	28.3 V
3Ω	16.0 V	not recommended
2Ω	14.1 V	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	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)