JL Audio HD600/4 owner manual Protect Your Hearing, Serial Number, Stupid Mistakes to Avoid

Protect Your Hearing!

We value you as a long-term customer. For that reason, we urge you to practice restraint in the operation of this product so as not to damage your hearing and that of others in your vehicle. Studies have shown that continuous exposure to high sound pressure levels can lead to permanent (irreparable) hearing loss. This and all other high-power amplifiers are capable of producing such high sound pressure levels when connected to a speaker system. Please limit your continuous exposure to high volume levels.

While driving, operate your audio system in a manner that still allows you to hear necessary noises to operate your vehicle safely (horns, sirens, etc.).

Serial Number

In the event that your amplifier requires service or is ever stolen, you will need to have a record of the product’s serial number. Please take the time to enter that number in the space provided below. The serial number can be found on the bottom panel of the amplifier and on the amplifier packaging.

Serial Number:

Installation Applications	Cooling Efficiency Considerations:	Safety Considerations:
This amplifier is designed for operation in	Your JL Audio amplifier employs an	Your amplifier needs to be installed in a dry,
vehicles with 12V, negative-ground electrical	advanced type of heat management, called	well-ventilated environment and in a manner
systems. Use of this product in vehicles with	RealSink™. This feature takes advantage of	which does not interfere with your vehicle’s safety
positive ground and/or voltages other than 12V	convection and radiation effects to remove	equipment (air bags, seat belt systems, ABS brake
may result in damage to the product and will void	heat from the amplifier circuitry. For optimum	systems, etc.). You should also take the time to
the warranty.	cooling performance, the vertical heat sinks	securely mount the amplifier using appropriate
This product is not certified or approved for	located at the sides of the amplifier should be	hardware so that it does not come loose in the
use in aircraft.	exposed to as large a volume of air as possible.	event of a collision or a sudden jolt to the vehicle.
Do not attempt to “bridge” the outputs of this	Enclosing the amplifier in a small, poorly
amplifier with the outputs of a second amplifier,	ventilated chamber can lead to excessive heat	Stupid Mistakes to Avoid:
including an identical one.	build-up and degraded performance. If an	• Check before drilling any holes in your vehicle
	installation calls for an enclosure around the	to make sure that you will not be drilling
Planning Your Installation	amplifier, we recommend that this enclosure	through a gas tank, brake line, wiring harness or
It is important that you take the time to read	be ventilated with the aid of a fan. In normal	other vital vehicle system.
this manual and that you plan out your	applications, fan-cooling is not necessary.	• Do not run system wiring outside or underneath
installation carefully. The following are some	If mounting the amplifier under a seat,	the vehicle. This is an extremely dangerous
considerations that you must take into account	make sure there is at least 1 inch (2.5 cm) of	practice which can result in severe damage to
when planning your installation.	space above the amplifier’s outer shell to permit	your vehicle and person.
	proper cooling.	• Protect all system wires from sharp metal
		edges and wear by carefully routing them,
		tying them down and using grommets and
		loom where appropriate.
		• Do not mount the amplifier in the engine
		compartment, under the vehicle, on the roof
		or in any other area that will expose the
		amplifier circuitry to the elements.

Power Status

Filter Slope

Input Sensitivity

Input Mode

Preouts From

Input Sensitivity

Filter Slope

Indicator

Selection

Control

Selection

Selection

Control

Selection

(pg. 16)

(pg. 11)

(pg. 10)

(pg. 9)

Remote Level

(pg. 13)

(pg. 10)

(pg. 11)

Filter Mode

Filter Frequency

Input Voltage

Control

Input Voltage

Filter Frequency

Filter Mode

Selection

Selector

Selection

Selection

Selection

Selector

Selection

(pg. 11)

(pg. 11)

(pg. 10)

(pg. 13)

(pg. 10)

(pg. 11)

(pg. 11)

Chassis Ground			Front Left & Right		Left & Right Preamp				Front	Rear
Connector			Channel Input Jacks			Output Jacks			Speaker Outputs	Speaker Outputs
(pgs. 6-7)			(pg. 9)			(pg. 13)		Jack for	(pgs. 14-15)	(pgs. 14-15)
+12 V Power	Remote Turn-On			Rear Left & Right			Remote Level
Connector		Connector		Channel Input Jacks			Control Knob
(pgs. 6-7)		(pgs. 6-7)			(pg. 9)			(pg. 13)
+12 VDC Ground		Remote		L			L
			Front	Inputs	Rear	Preouts		Remote
								Level
				R			R	Control

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