Bedienungsanleitung JL Audio 1D (Seite 4 von 37) (Englisch)

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6 JL Audio JX250/1 • JX500/1D • JX1000/1D 7

ENGLISH

2) Hi-Level Inputs: If your system does not offer

a preamp level signal option, you can connect

speaker level signals directly to the “Hi-Level

Inputs” connector using the supplied mating

connector and wire harness. Simply splice the

appropriate left/right and positive/negative

wires to the included harness and plug the

harness into the “Hi-Level Inputs” connector

on the amplifier. The JX monoblock will

attenuate the high-level signal to make it

compatible with its input stage.

IMPORTANT!

Make sure you observe correct polarity in

making the “Hi-Level Input” connections.

Failure to do so will result in a complete loss of

signal (no bass).

The connections for the “Hi-Level Inputs” plug wires

are as follows from left to right on the plug:

White: Left Positive (+)

White/Black: Left Negative (–)

Black: Common Ground (rarely used)*

Gray: Right Positive (+)

Gray/Black: Right Negative (–)

*The only time you will use the “Common

Ground” connection is with some older (pre-

1980’s) factory systems or head units that ground

their speakers to chassis ground. To use this

connection, ground the black wire on the plug to

chassis ground and only connect the Left and Right

Positive plug wires to the factory radio outputs.

IMPORTANT!

If you plan to use the preamp outputs to feed a

stereo amplifier, you must connect stereo

signals to the inputs of the amplifier. A mono

signal into the amplifier will result in a mono

signal out of its preamp output.

“INPUT SENSITIVITY” GAIN ADJUSTMENT

Located to the left of the input connectors is a

rotary control labeled “Input Sens.”. This rotary

control can be used to match the source unit’s

output voltage to the input stage of the amplifier

for maximum clean output.

Rotating the control clockwise will result

in higher sensitivity (louder for a given input

voltage). Rotating the control counter-clockwise

will result in lower sensitivity (quieter for a given

input voltage). To properly set the amplifier for

maximum clean output, please refer to Appendix

A (page 12) in this manual. After using this

procedure, you can then adjust the level of the

amplifier by adjusting the input sensitivity

downward, if the amplifier requires attenuation to

achieve the desired system balance.

Do not increase the “Input Sens.” setting for

any amplifier in the system beyond the maximum

level established during the procedure outlined

in Appendix A (page 12). Doing so will result in

audible distortion and possible speaker damage.

REMOTE TURNON

The JX monoblock amplifier is turned on

and off using a conventional +12V remote

turn-on lead, typically controlled by the

source unit’s remote turn-on output.

The amplifier will turn on when +12V is

present at its “Remote” input and turn off when

+12V is switched off. If a source unit does not

have a dedicated remote turn-on output, the

amplifier’s turn-on lead can be connected to +12V

via a switch that derives power from an ignition-

switched circuit.

18 AWG wire is more than adequate for the

remote turn-on connection. To connect the

remote turn-on wire to the amplifier, strip 1/2-

inch (12 mm) of insulation from the wire and

insert it into the “Remote” receptacle on the

power connector. Tighten the connector down

using the supplied 2.5 mm hex wrench.

AMPLIFIER INPUTS

The JX monoblock amplifier offers

two input connection methods, one for

high-level (speaker level) signals and one

for low-level (preamp level) signals.

You may run a stereo or a mono signal into

the inputs of the amplifier. The amplifier’s input

section automatically sums stereo signals to mono

for the internal amplifier section.

The amplifier will operate with only one input

connection (left or right), but will require an

increase in input sensitivity to overcome the loss

of signal. For this reason, when feeding a mono

input signal into the "Low-Level Inputs", use a

Y-adaptor splitter to split the mono signal and

connect it to both the Left and Right Low-Level

Inputs of the amplifier.

When feeding a mono signal to the "Hi-Level

Inputs", connect it in parallel to both left and

right input wires.

1) Low-Level Inputs: A standard left/

right pair of RCA type jacks is used for

preamp level (low-level) signal input on

the JX monoblocks. This is the preferred

connection method whenever available.

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