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8 | JL Audio - HD600/4 Owner’s Manual

AMPLIFIER INPUTS

The HD600/4 has two separate input sections,

one for the “Front” left and right channels and

another for the “Rear” left and right channels.

Each section consists of a pair of RCA-type input

jacks on the Connection Panel of the amplifier

and a pair of input controls on the Control Panel

of the amplifier: an “Input Voltage” switch and an

“Input Sens.” rotary control.

Rear

Preouts

Remote

Level

Control

Front

Inputs

+12 VDC Ground Remote

“INPUT MODE” SWITCH

The Control Panel houses an “Input

Mode” switch located under the “General Setup”

heading. This switch allows operation of all four

amplifier channels with only one pair of input

signals or with independent front and rear input

signal pairs.

To use separate inputs for the “Front” and

“Rear” amplifier sections, (in order to permit

front-to-rear fading, for example), select “4 Ch.”

on the “Input Mode” switch. In this mode, you

must connect separate pairs of input cables to the

“Front” and “Rear” amplifier inputs.

To operate all four channels of the HD600/4

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. In

this mode, the amplifier will route the

signals connected to the “Front” inputs to

the Front and Rear amplifier channels.

CHANNEL CONTROL SECTIONS

Flanking the “General Setup” section

on the Control Panel of the amplifer are

two sets of identical controls: one for the

“Rear Channel Controls” (on the left side)

and one for the “Front Channel Controls”

of the amplifier (on the right side).

In each of these sections you will find an

“Input Voltage” range switch and a rotary

control labeled “Input Sens.” (Input Sensitivity).

These controls are designed to match the input

sensitivity of the HD600/4 to the specific signal

source that is feeding it and must be adjusted,

with care, following the procedures outlined in

this manual. Failure to make correct adjustments

can result in weak output, excessive distortion

and/or undesirable noise in the audio output of

the amplifier!

Note: The Channel Control sections also house

“Filter Mode”, “Filter Slope” and “Filter Freq.”

controls. These are crossover filter controls

and will be discussed in the next section of this

manual. This section will explain the Input

Controls only.

AMPLIFIER MOUNTING OPTIONS

The HD600/4 has two mounting options to

ease in installation.

Standard Mounting

The standard method of mounting requires

removal of the four corner caps with the 3/16-inch

hex wrench included with your amplifier. Using

appropriate mounting screws (not included),

secure the amplifier in all four corners and

replace the corner caps.

Lateral Mounting Feet

Lateral Mounting Feet are also included with

your HD600/4 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 1/8-inch

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 HD600/4 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.

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