Bedienungsanleitung JL Audio RD400 (Seite 11 von 20) (Englisch)

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If the condition remains, it will return to red

and mute the output again. A continuous

over-current condition is displayed with

alternating red/blue lights. Because the muting

behavior may be very short in duration, it

may manifest itself as an audible, repetitive

ticking or thumping noise in the output.

Over-current conditions can be caused by a

speaker impedance lower than the optimum

load impedance range for the amplifier or a

short-circuit in the speaker wiring. The latter

can result from a short circuit between the

positive and negative speaker wires or between

either speaker wire and the vehicle chassis.

4) LEDs off / Amplifier Shuts Off Unexpectedly

The only condition that will shut down an

undamaged RD400/4 completely is if battery

voltage or remote turn-on voltage drops below

10 volts. The LED light strip will turn off when

this occurs. The amplifier will turn back on

when voltage climbs back above 11 volts. If

this is happening in your system, have your

charging system and power wiring inspected.

For more information on troubleshooting this

amplifier, refer to Appendix C (pages 16, 17).

SYSTEM CONFIGURATIONS

The RD400/4 is a flexible amplifier, well-suited

for a multitude of system configurations. In this

section, the most likely configurations for a system

with a single RD400/4 are explained in detail.

Once you have selected your desired

configuration, you can use the amplifier panel

drawing on pages 18 & 19 to mark the required

switch positions for easy reference.

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 RD400/4 can be configured to drive a

bi-amplified system by itself or with a separate

subwoofer amplifier.

Bi-Amplified System with one RD400/4

In this configuration, channels 3&4 of the

RD400/4 will drive subwoofers (stereo or bridged)

with low-pass filtering. Channels 1&2 will

drive component speakers in stereo with

high-pass filtering.

Input connection options for a bi-amplified system

with one RD400/4 are as follows:

A) No User Adjustability:

Req uired: a basic source unit or processor

with one pair of stereo outputs.

Inp ut Connections: a single pair of stereo source

unit outputs connected to the “CH 1 (Left)”

and“CH 2 (Right)” inputs of the RD400/4

(select “2 Ch.” on the “Input Mode” switch).

Res ult: the relative level of the LF and HF

channels will be determined by the RD400/4’s

“Input Sensitivity” settings and will not be

user adjustable from the front of the vehicle.

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JL Audio RD400 Seite 11

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