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8 | JL Audio - HD900/5 Owner’s Manual

AMPLIFIER INPUTS

The HD900/5 has three separate input sections,

one for the “Front” left and right channels,

another for the “Rear” left and right channels

and one for the Subwoofer Channel. Each section

consists of a pair of RCA-type input jacks on

the Connection Panel of the amplifier and input

controls on the Control Panel of the amplifier: a

single “Input Voltage” switch, an “Input Mode”

switch and three individual “Input Sens.” rotary

controls (one in each channel section).

“INPUT MODE” SWITCH

The “Input Mode” switch is located under

the “General Setup” heading at the far right of

the control panel. This switch allows operation

of all five amplifier channels with only one pair

of input signals (2 ch.) or with independent front

and rear input signal pairs (4 ch.) or with discrete

front, rear and subwoofer signal pairs (6 ch.).

“6 Ch.” Input Mode

In this mode, you will connect separate pairs

of input cables to the “Front”, “Rear” and “Sub”

amplifier inputs, allowing you full channel

control from the source unit. If the source unit

only provides a mono (single) subwoofer output,

use a y-adaptor cable to feed both the “Left” and

“Right” subwoofer inputs of the HD900/5 with

the mono signal. Failure to do so will result in

reduced gain and possible distortion.

“4 Ch.” Input Mode

In this mode, you will connect separate

pairs of input cables to the “Front” and “Rear”

amplifier inputs and leave the “Sub” inputs

unused. The subwoofer channels will receive

signal from the sum of the signals at the “Front”

and “Rear” inputs so that front-to-rear fading of

the main channels does not significantly affect

the subwoofer level.

“2 Ch.” Input Mode

To operate all five channels of the HD900/5

with a single pair of stereo inputs, select the

“2 Ch.” position on the “Input Mode” switch

and connect a single pair of input cables to

the “Front” input jacks only. The “Rear”

and “Sub” input jacks will remain unused.

In this mode, the amplifier will route the

signals connected to the “Front” inputs to

the Front, Rear and Subwoofer channels.

Front-to-rear fading will not be available.

“Input Voltage” Switch

A wide range of signal input voltages can be

accommodated by each of the HD900/5’s differential-

balanced inputs (200mV – 8V RMS). This wide range

is split up into two sub-ranges, accessible via the

“Input Voltage” switch located next to the “Input

Mode” switch under the “General Setup” heading.

The “Low” position of the “Input Voltage”

switch selects an input sensitivity range between

200mV and 2V for all the amplifier channels. This

means that the “Input Sens.” rotary controls will

operate within that voltage window. If you are

using an aftermarket source unit, with preamp-

level outputs, this is most likely the position that

you will use (regardless of what voltage output

capability is claimed by the source unit).

The “High” position of the “Input Voltage”

switch selects an input sensitivity range between

800mV and 8V. This is for use with speaker-level

outputs from source units and small amplifiers

found in many OEM (factory-installed) systems.

To use speaker-level sources, splice the speaker

output wires of the source unit or small amplifier

onto a pair of RCA plugs for each input pair or use

the JL Audio ECS Speaker Wire to RCA adaptor

(XB-CLRAIC2-SW). It is not necessary (or advisable)

to use “Line Output Converters” with

your HD900/5.

AMPLIFIER MOUNTING OPTIONS

The HD900/5 has two mounting options to

ease in installation.

Standard Mounting

The standard method of mounting requires

removal of the four corner caps with the 4 mm

hex wrench included with your amplifier. Using

appropriate mounting screws (not included),

secure the amplifier in all four corners and

replace the corner caps to cover the screws.

Lateral Mounting Feet

Lateral Mounting Feet are also included with

your HD900/5 to provide an alternative mounting

option. Each mounting foot should be attached

to the bottom of the amplifier by screwing the

provided bolt into the bottom of the amplifier and

up into the corner cap with the supplied 2.5 mm

hex wrench. Next, using appropriate mounting

screws (not included), secure the amplifier by its

four Lateral Mounting Feet.

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.

CONTROL PANEL SECURITY COVER

The HD900/5 features a Control Panel

Security Cover. When installed, the cover ensures

that your amplifier settings are not accidentally

changed while creating a clean aesthetic for the

amplifier and your installation. The control panel

security cover is pre-installed at the factory and

must be temporarily removed for access to the

controls described throughout this manual.

The security cover is secured by a single 2.5

mm hex-head screw at the far right of the panel.

Loosen the hex-head screw to release the security

cover (it is not necessary to completely remove the

screw). To re-install the security cover once all

adjustments have been made, insert the tongue on

the cover’s left edge into the groove where the left-

side heatsink meets the control panel, hinge the

panel closed and secure the screw using the

supplied 2.5 mm hex wrench. Do not overtighten

the screw.

JL Audio 5 Seite 5

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