Jbl GTH400-20107 User Manual download pdf (Page 18)

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•The GTH400 will draw as much as 60

amps from the vehicle’s electrical

system, enough to overload

conventional vehicle wiring. Therefore

the +12 volt power supply must be

taken directly from the positive side of

the battery.

Do not connect to the vehicle’s fuse

block or to a wire feeding other

accessories.

•To prevent electrical system damage

or fire, a fuse holder and fuse (not

included – maximum 60 Amp) must be

installed in the power supply wire as

close to the battery as possible, and

before the wire travels through the

firewall or other metal panel.

Ground Wire

•Proper grounding is extremely

important. Use a heat- and oil-

resistant stranded copper automotive

wire equivalent to the size used for the

+12V connection. Crimp or solder and

insulate any wire-to-wire connections.

Keep the ground wire as short as

possible. A ground wire must be

solidly connected to a major sheet

metal structure of the vehicle such as

a panel near the amp-mounting

location. Scrape all paint and primer

off the sheet metal at the grounding

point to ensure a good electrical

connection. Attach the wire to the

grounding point with a nut, bolt and

star washer. The high current

demanded by high-powered amplifiers

requires a more secure ground than

the typical sheet-metal screw will

provide.

The color code for the speaker-level

input harness is as follows:

Speaker-Level Input Harness

Color Codes

Group 1 Left (+): White

Group 1 Left (–): White with

Black Stripe

Group 1 Right (+): Gray

Group 1 Right (–): Gray with

Black Stripe

Group 2 Left (+): Green

Group 2 Left (–): Green with

Black Stripe

Group 2 Right (+): Purple

Group 2 Right (–): Purple with

Black Stripe

5. Adjusting the Gain

Before operating the GTH400, recheck

all wiring connections to make sure they

are correct and secure. Be sure that a

fuse (60 amps, not included) is installed

in the +12V line near the battery.

Reconnect the negative ground (–)

terminal of the battery. Make sure that

the mode switches, crossover switches,

Group 2 & 3 Input switches, and

crossover frequency modules, are

properly set.

•The setting of the gain controls on the

GTH400 is important to ensure proper

performance, low noise levels, and

maximum reliability in the system. As a

general rule, controls on components

at the front-end of the system (source,

equalizers, electronic crossovers, etc.)

should be set as high as possible, with

the amplifier gain control set as low as

possible while still providing adequate

volume levels. Using a high signal level

from the source and a low gain setting

on the amplifier will help keep

GTH400-20107 06/03/98 15:49 Side 17

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