JL Audio HD900/5 owner manual Protect Your Hearing, Serial Number, Installation Applications

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

This amplifier is designed for operation in vehicles with 12V, negative-ground electrical systems. Use of this product in vehicles with positive ground and/or voltages other than 12V may result in damage to the product and will void the warranty.

This product is not certified or approved for use in aircraft.

Do not attempt to “bridge” the outputs of this amplifier with the outputs of a second amplifier, including an identical one.

Planning Your Installation

It is important that you take the time to read this manual and that you plan out your installation carefully. The following are some considerations that you must take into account when planning your installation.

Infrasonic Filter		Filter Frequency	Input Sensitivity
Selector		Selector		Control
(pg. 11)		(pg. 11)		(pg. 10)
Power Status	Input Sensitivity		Filter Slope	Filter Fre
Indicator		Control	Selection	Selec
(pg. 15)		(pg. 10)	(pg. 11)	(pg.

Chassis Ground			Left & Right		Left & Right
Connector			Input Jacks:		Input Jacks:
(pgs. 6-7)		Front Channels		Left & Right	Subwoofer	Jack for
+12 V Power	Remote Turn-On		(pg. 9)	Input Jacks:	(pg. 9)	Remote Level
Connector	Connector			Rear Channels		Control Knob
(pgs. 6-7)	(pgs. 6-7)			(pg. 9)		(pg. 13)

2 JL Audio - HD900/5 Owner’s Manual