Bedienungsanleitung JL Audio MHD900 (Seite 3 von 13) (Englisch)

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4 | JL Audio - MHD900/5 Owner’s Manual

TYPICAL INSTALLATION SEQUENCE

The following represents the sequence for

a typical amplifier installation, using an

aftermarket source unit or OEM Interface

processor (like the CleanSweep® CL441dsp).

Additional steps and different procedures may

be required in some applications. If you have

any questions, please contact your authorized

JL Audio dealer for assistance.

1) Disconnect the negative battery post

connection and secure the disconnected cable

to prevent accidental re-connection during

installation. This step is not optional!

2) Run positive and negative power wire

from the battery location to the amplifier

mounting location, taking care to route it

in such a way that it will not be damaged

and will not interfere with vessel operation.

4 AWG is the minimum recommended

wire size for this amplifier. Use a 2 AWG

or 1/0 AWG main power wire with a power

distribution block when additional amplifiers

are being installed with the MHD900/5 and

powered from the same main power wire.

3) Connect power wire to the positive battery

post. Fuse the wire with an appropriate fuse

block (and connectors) within 18 inches (45

cm) wire length of the positive battery post.

This fuse is essential to protect the vessel.

Do not install the fuse until the power wire

has been connected to the amplifier.

4) Connect negative power wire to the negative

battery post. Use the same size power wire as

the wire connected to the “+12V” connection.

5) Run signal cables (RCA cables) and remote

turn-on wire from the source unit or interface

processor to the amplifier mounting location.

6) Run speaker wire from the speaker systems to

the amplifier mounting location.

7) Securely mount the amplifier using

appropriate hardware. (See page 8 for detailed

mounting instructions).

8) Connect the remote turn-on wire and the

positive and negative power wires to the

amplifier’s power connector plug. Then insert

the power connector plug into the amplifier’s

power connector receptacle, pushing firmly.

9) Connect the RCA input cables

to the amplifier.

10) Connect the speaker wires to the speaker

connector plugs and insert the plugs firmly

into the speaker connector receptacles.

11) Carefully review the amplifier’s control

settings to make sure that they are set

according to the needs of the system.

12) Install power wire fuse (60A for a

single MHD900/5) and reconnect the negative

battery post terminal.

13) Turn on the source unit at a low level

to double-check that the amplifier is

configured correctly. Resist the temptation

to crank it up until you have verified the

control settings.

14) Make necessary adjustments to the input

sensitivity controls to obtain the right

overall output and the desired balance

in the system. See Appendix C (pages 18, 19)

for the recommended input sensitivity

setting method.

15) Enjoy the fruits of your labor with your

favorite music.

PRODUCT DESCRIPTION

The JL Audio MHD900/5 is a very powerful

and compact five-channel amplifier utilizing

patented Single Cycle Control™ Class D

technology for all channels. This groundbreaking

technology delivers reference-grade, full-

range sonic performance while requiring

far less current from the vessel’s electrical

system than a conventional amplifier.

JL Audio’s exclusive R.I.P.S. power supply

design optimizes the output of each channel

section for any impedance between 1.5 and 4

ohms per channel (3-8 ohms bridged on front

and rear sections) allowing you to get full use of

the MHD900/5’s performance capabilities with a

wide range of speaker systems.

The tightly regulated power supply design also

means that the MHD900/5’s clean power output

capability remains stable over a wide range of

vessel voltages, resulting in enhanced fidelity.

The MHD900/5 flexible, studio-grade signal

processing allows it to be deployed in several

different system configurations:

1) As a five-channel amplifier in a bi-amplified

system, driving four satellite speakers (100W x

4), plus a subwoofer system (500W x 1).

2) As a very powerful three-channel amplifier

in a bi-amplified system, driving two satellite

speakers (150W x 2, bridged), plus a subwoofer

system (500W x 1).

3) As a five-channel amplifier in a tri-amplified

system, driving two tweeters (100W x 2), plus

two woofer/mids (100W x 2), plus a subwoofer

system (500W x 1). An external 2-way

crossover is required for this application.

The MHD900/5’s flexible input and

crossover sections permit operation with

a wide variety of source units and system

configurations. It can be operated with a single

pair of stereo inputs, with two pairs of stereo

inputs (front and rear) or with separate inputs

for its front, rear and subwoofer channels.

As we said, it’s very flexible.

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