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12 | JL Audio - HD600/4 Owner’s Manual

PREAMP OUTPUTS

The HD600/4 incorporates a pass-through

preamp output section, so that additional

amplifiers can easily be connected to the same

signal(s) feeding the HD600/4. These preamp

output signals are accessible via a stereo pair

of RCA-type jacks, labeled “Preouts”, on the

Connection Panel.

Rear

Preouts

Remote

Level

Control

Front

Inputs

+12 VDC Ground Remote

The term “pass-through” refers to the fact that

the Preamp Output signals are not affected by any

crossover filter or input sensitivity setting selected

on the HD600/4 (if the input signal is full-range,

the Preamp Output will be full-range). These

preamp output signals are buffered to prevent

noise and are always preamp level, regardless of

the level of signals feeding the HD600/4’s inputs.

The pass-through Preamp Outputs can be

configured two different ways using the switch

labeled “Preouts From” in the “General Setup”

section of the Control Panel.

1) “Front”: The preamp output delivers the same

signal that is connected to the HD600/4’s

“Front Inputs”. This mode is useful for

feeding a subwoofer amplifier when the

HD600/4 is being used to drive front and rear

speaker systems. In this mode, the preamp

output level will track with the signal level

of the front input signals, allowing the user

to fade the rear channels in and out, without

affecting the subwoofer level.

3) “F+R” (Front + Rear): This mode delivers a

sum of the signals being fed to the “Front

Inputs” and the “Rear Inputs” of the

amplifier. When the HD600/4 is being used

to drive front and rear speaker systems, this

preamp output mode will deliver a summed

front/rear signal to the subwoofer amplifier,

while permitting fading of the front and rear

speaker systems from the source unit.

REMOTE LEVEL CONTROL OPTIONAL

With the addition of the optional Remote Level

Control (HD-RLC), you can control the volume

of one or both channel pairs of the HD600/4

from the front of the vehicle. This is useful for

subwoofer level control or even as a master

volume control for the system.

The HD-RLC connects to the jack labeled

“Remote Level Control” on the Connection

Panel of the amplifier using a standard telephone

cable (supplied with the HD-RLC).

If desired, multiple HD amplifiers can be

controlled from a single HD-RLC controller

using a simple phone line “splitter” and multiple

phone cables.

Rear

Preouts

Remote

Level

Control

Front

Inputs

+12 VDC Ground Remote

When connected to the amplifier, the HD-RLC

operates as follows. At full counter-clockwise

rotation, the audio will mute completely. At full

clockwise rotation the level will be the same as if

the HD-RLC was not connected at all. In other

words, it operates strictly as a level attenuator.

Depending on the application, you may want

the HD-RLC to only affect one channel pair or

both channel pairs. A switch labeled “Remote

Level Control” in the “General Setup” Section

of the Control Panel allows you to determine

whether the HD-RLC affects the level of all

channels “All Ch.” or only the rear channels

“Rear Ch.”

BIAMPLIFIED SYSTEMS

Bi-amplified systems are defined as systems

in which separate amplifier channels drive low-

frequency (LF) and high-frequency (HF) speakers

and are separately filtered to send appropriate

frequency ranges to each speaker system.

The most common application of

bi-amplification in mobile audio is to drive a

subwoofer system from one or more amplifiers or

channels and component speakers from separate

amplifiers or channels.

The HD600/4 can be configured to drive a

bi-amplified system by itself or with a separate

subwoofer amplifier.

Bi-Amplified System with one HD600/4

In this configuration, the “Rear” channels

of the HD600/4 will drive subwoofers

(stereo 150W x 2 or bridged 300W x 1) with

low-pass filtering. The “Front” channels

will drive component speakers in stereo

(150W x 2) with high-pass filtering.

Crossover Setup for Bi-Amplified System

with one HD600/4:

Once the input sections have been configured

appropriately, go to the “Rear Channel Controls”

Section. Select “LP” (low-pass) on the “Filter

Mode” switch and “12dB” or “24dB” on the

“Filter Slope” switch and an appropriate “Filter

Freq.” (80-90 Hz is a good starting point).

Next, turn your attention to the “Front

Channel Controls” Section. and select “HP”

(high-pass) on the “Filter Mode” switch and

“12dB” or “24dB” on the “Filter Slope”

switch and an appropriate “Filter Freq.”

(again, 80-90 Hz is a good starting point).

After proper adjustment of the Front and

Rear channel “Input Range” and “Input

Sens.” controls using the method shown

in Appendix C (pages 18, 19), you can

fine tune filter frequencies and slopes and

attenuate either pair of channels to achieve

proper balance. For precise filter frequency

information refer to Appendix B (page 18).

Bi-Amplified System with one

HD600/4 in four-channel mode and

a separate subwoofer amplifier

This configuration requires that the

separate subwoofer amplifier has a built-in

low-pass filter. In this configuration, the

“Front” channels of the HD600/4 will drive

front component speakers (stereo 150W x 2)

with high-pass filtering. The “Rear” channels

will drive rear component speakers in stereo

(150W x 2) with high-pass filtering.

The separate subwoofer amplifier will drive the

subwoofer system with low-pass filtering (select a

filter frequency of 80-90 Hz to start). The inputs

of the subwoofer amplifier can be fed from the

HD600/4’s preamp output or from a dedicated

subwoofer output on the source unit.

Crossover Setup for Bi-Amplified System with one

HD600/4 and a separate subwoofer amplifier:

Once the input and preamp output sections

have been configured appropriately, go to the

“Front Channel Controls” Section. Select “HP”

(high-pass) on the “Filter Mode” switch and

“12dB” or “24dB” on the “Filter Slope” switch

and an appropriate “Filter Freq.” (80-90 Hz is a

good starting point).

Next, turn your attention to the “Rear

Channel Controls” Section and select “HP”

(high-pass) on the “Filter Mode” switch and

“12dB” or “24dB” on the “Filter Slope” switch

and an appropriate “Filter Freq.” (again, 80-90 Hz

is a good starting point).

After proper adjustment of the HD600/4’s and

the subwoofer amplifier’s “Input Range” and

“Input Sens.”, you can fine tune filter frequencies

and slopes and attenuate either pair of channels

to achieve proper balance. For proper adjustment

of the “Input Sens.” controls of the HD600/4 use

the method shown in Appendix C (pages 18, 19).

For precise filter frequency information for the

HD600/4 refer to Appendix B (pages 18). Refer to

the subwoofer amplifier owner’s manual for its

proper adjustment levels.

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