Bedienungsanleitung JL Audio HD900 (Seite 7 von 13) (Englisch)

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12 | JL Audio - HD900/5 Owner’s Manual

REMOTE LEVEL CONTROL OPTIONAL

With the addition of the optional Remote Level

Control (HD-RLC), you can control the level of

the Subwoofer Channel of the HD900/5 from

the front of the vehicle. 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.

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.

When no HD-RLC is connected, the Level

Control circuit is defeated.

The RBC-1 Remote Bass Control used with

JL Audio Slash, Slash v2, e-Series, A-Series and

G-Series amplifiers is NOT compatible with the

HD Series amplifiers. If you attempt to connect

an RBC-1 to an HD amplifer, the control will

not work. You must use the HD-RLC controller.

SPEAKER OUTPUTS

The HD900/5 employs JL Audio’s exclusive

Regulated, Intelligent Power Supply (R.I.P.S.)

design. The operation of the R.I.P.S. system is

independent for each channel section. This

sophisticated power supply allows the amplifier to

produce its optimum power into higher

impedances as well as low impedances.

The R.I.P.S.-equipped HD900/5 gives

you the freedom to use a variety of speaker

configurations that achieve final nominal

impedances between 1.5 – 4Ω per channel

in stereo while maintaining 75 - 100W x 4

of clean power output. When bridged, each

main channel pair will optimize output at

150-200 watts between 3 – 8Ω. The mono

subwoofer channel will deliver its full 500W

output into any impedance between 1.5-4Ω.

The operation of the R.I.P.S. circuitry is

entirely automatic and adjusts itself every time the

amplifier is turned on. There are no user controls

to configure. The system operates through

multiple stages of impedance optimization,

choosing the stage most appropriate to the actual

impedance of the speakers you connect to it.

If you connect a load higher than 4Ω nominal

per channel in stereo mode (or 8Ω in bridged

mode), power will drop by half with every

doubling of impedance above 4Ω stereo / 8Ω

mono. If you connect a load lower than 1.5Ω

nominal per channel in stereo mode (or 3Ω in

bridged mode, the amplifier protection

circuitry activates a “safe” mode which reduces

amplifier power to protect the circuitry from

failure (the LED status indicator on the control

panel will light up amber to indicate that this

has happened). See page 15 for details.

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 HD900/5 can be easily configured to drive

a complete bi-amplified system consisting of a

subwoofer and four main speakers or a subwoofer

and two main speakers.

Bi-Amplified System with one HD900/5

driving four main speakers plus subwoofer

(5-Channel Mode)

In this configuration, the “Front” channels

of the HD900/5 will drive front component

speakers (stereo 100W x 2 @ 4Ω) with high-

pass filtering. The “Rear” channels will drive

rear component speakers in stereo (100W x 2

@ 4Ω) with high-pass filtering. The subwoofer

channel will drive the subwoofer system

(500W x 1 @ 1.5-4Ω) with low-pass filtering.

Once the input sections have been configured

appropriately, go to the “Front Channel

Controls” Section. Select “12dB” or “24dB” on

the “High-Pass Filter” 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 “12dB”

or “24dB” “High-Pass Filter” switch and an

appropriate “Filter Freq.” (again, 80-90 Hz is a

good starting point).

Finally, in the “Subwoofer Channel

Controls” Section, select “12dB” or

“24dB” on the “Low-Pass Filter” Switch

and a “Filter Freq.” of 80-90 Hz.

After proper adjustment of the HD900/5’s

“Input Range” and “Input Sens.” controls,

you can fine tune filter frequencies

and slopes and attenuate each channel

section to achieve proper balance.

Bi-Amplified System with one HD900/5

driving two main speakers plus subwoofer

(3-Channel Mode)

In this configuration, the “Front” channels

of the HD900/5 will be bridged to drive the

left front component speaker system (150W x

1 @ 4Ω) with high-pass filtering. The “Rear”

channels will be bridged to drive the right front

component speaker system (150W x 1 @ 4Ω),

also with high-pass filtering. The “Subwoofer”

channel will drive the subwoofer system

(500W x 1 @ 1.5-4Ω) with low-pass filtering.

For information on proper bridging

techniques refer to the section titled “Bridging

Considerations” in this manual (page 14).

Once the input sections have been configured

appropriately, go to the “Front Channel

Controls” Section. Select “12dB” or “24dB”

on the “High-Pass Filter” and an appropriate

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

Next, turn your attention to the “Rear

Channel Controls” section and set it exactly the

same as you set the “Front Channel Controls”.

Finally, in the “Subwoofer Channel

Controls” section, select “12dB” or

“24dB” on the “Low-Pass Filter” switch

and a “Filter Freq.” of 80-90 Hz.

After proper adjustment of the HD900/5’s

“Input Range” and “Input Sens.” controls,

you can fine tune filter frequencies and

slopes and attenuate each channel section to

achieve proper balance. Keep in mind that

the left and right front speakers will have

independent “Input Sens.” controls in this

configuration, and these need to be carefully

matched for proper stereo performance.

JL Audio HD900 Seite 7

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