Jbl GTH400-20107 User Manual download pdf (Page 20)

19

position for driver-optimized sound

stage.

5. Proceed to push and pull the Rear-

Ambience knob to hear the effects

of “Driver” and “All” modes. You

should hear imaging coming from

the middle of the dashboard when

the knob is pushed in (“Driver”

mode). You should hear stereo with

ambience recovery when the knob

is pulled out (“All” mode). If you find

that the center imaging in the

“Driver” position is slightly offset to

the left or right side of the

dashboard, switch the car-size

switch located inside of the

GTH400 under the bottom cover as

shown below. This switch optimizes

the Imaging Enhancer for standard

or large cars.

6. Slowly turn the “Front-Ambience”

knob in the clockwise direction to

increase ambience. You should

begin to hear slight reverberation in

the music and a sense of a

widening front sound stage in both

the “Driver” and “All” modes.

7. Slowly turn the “Rear-Ambience”

knob in the clockwise direction to

increase rear ambience (only in

systems with rear speakers). You

should begin to hear an increase in

reverberation and get a feeling of

being in a very large auditorium.

Note: The GTH400 converts the

rear channels into true rear-fill

surround channels which cancel

all center information (vocals, lead

instruments, etc.) and lets only true

ambience information come out.

This same process is used in more

expensive “Surround Sound”

systems used in theaters.

8. Adjust the front and rear ambience

as desired. For optimum center

imaging, it is recommended that

ambience be used sparingly on the

front channels.

9. To bypass the effects of the

Imaging Enhancer in the GTH400,

simply pull on the “Front-

Ambience” knob until it clicks to the

“Bypass” position. The “Enhancer

On” LED on the remote control

panel will turn off and your sound

system should revert back to

normal stereo sound without

ambience enhancement. The

Imaging Enhancer is also bypassed

when the remote control is

unplugged from the amplifier.

6. Important Characteristics

Overload Protection – The GTH400

incorporates elaborate protection cir-

cuitry to prevent damage to the

amplifier circuitry and ensure reliable

operation. This circuitry will turn the

amplifier off in the event of overheating,

a short circuit on the speaker output

wiring, or improper power supply

connections. If the amplifier cycles on

IMAGE

ENHANCER

MODULE

FRONT

PLATE

IMAGING ENHANCER

REMOTE PLUG

Standard Large

Imaging Enhancer

Car Size Switch

GTH400-20107 06/03/98 15:50 Side 19

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