Bedienungsanleitung JL Audio 4 (Seite 8 von 13) (Englisch)

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

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 16 for details.

Speaker loads below 1.5Ω nominal per channel

in stereo or 3Ω nominal in bridged mode are

not recommended and may cause the amplifier

output to distort excessively.

BRIDGING CONSIDERATIONS

Bridging is the practice of combining the

output of two amplifier channels to drive a single

load. When bridged, each channel produces

signals of equal magnitude, but opposite polarity.

The combined output of the two channels

provides twice the output voltage available from a

single channel. The HD600/4 has been designed

for bridging of its channel pairs without the need

for input inversion adaptors.

Rear Preouts

Remote

Level

Control

Front

Inputs

+12 VDC Ground Remote

To bridge a pair of channels, use the “Left +”

and “Right –” speaker connectors only

(the “Left –” and “Right +” remain unused).

Then connect a mono signal to both left and

right RCA inputs for that channel pair. This

requires an RCA “Y-Adaptor” (sold separately),

because a bridged pair of channels requires that

both amplifier channels of the bridged pair

receive input. Connection of only one RCA input

will result in reduced power output, increased

distortion and can cause the amplifier to overheat.

When bridged, each channel pair will

deliver optimum power into a 3-8Ω load.

Operating bridged channel pairs into a load

lower than 3Ω is not recommended.

Speaker Connector Plugs

To connect the speaker wires to the amplifier,

unplug the speaker connector plugs from the

amplifier chassis (pull back firmly) and back out

the set screws on each connector plug, using the

supplied 2.5 mm hex wrench. Strip 3/8 inch (10

mm) of insulation from the end of each wire and

insert the bare wire into the receptacle on the

speaker connector plug, seating it firmly so that

no bare wire is exposed. While holding each wire

in place, tighten each set screw firmly, taking care

not to strip the head of the screw.

For example, if you are using the HD600/4 in a

stand-alone bi-amplified mode, you may want the

HD-RLC to only affect the level of the subwoofer

channels. Setting the “Remote Level Control”

switch to the “Rear Ch.” position accomplishes

this (provided the subwoofer system is connected

to the rear channels).

In other cases, you may want control of all

four channels at the same time, so you would

set the “Remote Level Control” switch to the

“All Ch.” position.

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 HD600/4 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 pair of channels. This

sophisticated power supply allows the amplifier to

produce its optimum power (150 watts x 4) over a

wide range of speaker impedances.

Rear Preouts

Remote

Level

Control

Front

Inputs

+12 VDC Ground Remote

Unlike conventional amplifiers that require

a specific impedance to produce optimum

power, the R.I.P.S.-equipped HD600/4 gives

you the freedom to use a variety of speaker

configurations that achieve final nominal

impedances between 1.5 – 4Ω per channel in

stereo (without sacrificing power output or sound

quality). When bridged, each channel pair will

optimize output at 300 watts between 3 – 8Ω.

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.

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