Your amplifier has been designed and manufactured to exacting standards in order to ensure years of musical enjoyment in your vehicle. For maximum performance, we highly recommend that you have your new amplifier installed by an authorized JL Audio dealer. Your authorized dealer has the training, expertise and installation equipment to ensure optimum performance from this product. Should you decide to install the amplifier yourself, please take the time to read this manual thoroughly so as to familiarize yourself with its installation requirements and setup procedures. If you have any questions regarding the instructions in this manual or any aspect of your amplifier’s operation, please contact your authorized JL Audio dealer for assistance. If you need further assistance, please call the JL Audio Technical Support Department at (954) 443-1100 during business hours. 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) Filter Fre Sele (pg. Filter Slope Selection (pg. 11) Input Sensitivity Control (pg. 10) Power Status Indicator (pg. 15) Chassis Ground Left & Right Left & Right Connector Input Jacks: Input Jacks: (pgs. 6-7) Front Channels Left & Right Subwoofer Jack for (pg. 9) (pg. 9) Remote Level Control Knob (pg. 13) Input Jacks: Rear Channels (pg. 9) Remote Turn-On Connector (pgs. 6-7) +12 V Power Connector (pgs. 6-7) 2 | JL Audio - HD900/5 Owner’s Manual cooling efficiency considerations: Your JL Audio amplifier employs an advanced type of heat management, called RealSink™. This feature takes advantage of convection and radiation effects to remove heat from the amplifier circuitry. For optimum cooling performance, the vertical heat sinks located at the sides of the amplifier should be exposed to as large a volume of air as possible. Enclosing the amplifier in a small, poorly ventilated chamber can lead to excessive heat build-up and degraded performance. If an installation calls for an enclosure around the amplifier, we recommend that this enclosure be ventilated with the aid of a fan. In normal applications, fan-cooling is not necessary. If mounting the amplifier under a seat, make sure there is at least 1 inch (2.5 cm) of space above the amplifier’s outer shell to permit proper cooling. Filter Slope Filter Frequency Input Mode Selection Selector Selection (pg. 11) (pg. 10) (pg. 9) Input Voltage Selection (pg. 9) Input Sensitivity Control (pg. 10) quency tor 11) Filter Slope Selection (pg. 11) Speaker Outputs (pgs. 13-14) safety considerations: Your amplifier needs to be installed in a dry, well-ventilated environment and in a manner which does not interfere with your vehicle’s safety equipment (air bags, seat belt systems, ABS brake systems, etc.). You should also take the time to securely mount the amplifier using appropriate hardware so that it does not come loose in the event of a collision or a sudden jolt to the vehicle. stupid mistakes to avoid: • Check before drilling any holes in your vehicle to make sure that you will not be drilling through a gas tank, brake line, wiring harness or other vital vehicle system. • Do not run system wiring outside or underneath the vehicle. This is an extremely dangerous practice which can result in severe damage to your vehi...