Bedienungsanleitung JL Audio A4300 (Seite 5 von 11) (Englisch)

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SPEAKER OUTPUTS

The A4300’s speaker outputs are designed to

accept 16 AWG - 8 AWG wire.

Each pair of the A4300’s channels are

designed to deliver power into speaker loads equal

to or greater than 2 ohms per channel when using

a “stereo” configuration and speaker loads equal

to or greater than 4 ohms per bridged pair of

channels when using a “bridged” configuration.

Speaker loads below 2 ohms nominal per

channel are not recommended and may cause

the amplifier to initiate a protection mode

which reduces power output.

BRIDGING CONSIDERATIONS

Bridging is the practice of combining the

output of two amplifier channels to drive a single

load. When bridged, each channel produces

signals of equal magnitude, but opposite polarity.

The combined output of the two channels

provides twice the output voltage available from a

single channel. The A4300 has been designed for

bridging of its channel pairs without the need for

input inversion adaptors.

To bridge a pair of channels, use the

“Left +” and “Right –” speaker connectors only

(the “Left –” and “Right +” remain unused).

When bridged, each channel will deliver

optimum power into a 4 ohm load.

When a pair of channels are bridged, they

will deliver 150W x 1 into a 4 ohm load or

90W x 1 into an 8 ohm load. Operating a

pair of bridged channels into a load lower

than 4 ohms is not recommended.

Because a bridged pair of channels requires

that both channels receive input, you need to

connect both left and right inputs to the source

unit. Connection of only one input will result in

reduced power output, increased distortion and

can cause the amplifier to overheat.

Do not do this!

When a pair of the A4300’s channels are

operating in bridged mode, the output will be in

mono (only one channel). This mono channel

can contain right channel only information,

left channel only information or the sum of

the information from both the right and left

channels. In order to achieve one of these options,

configure the inputs to that pair of channels in

one of these two ways:

1) Left Channel Only or Right Channel Only

Information: If you wish to send a left-only

or right-only signal to a pair of the A4300’s

channels, use a “Y-Adaptor” to split the single

channel signal into both left and right RCA

inputs. This option is useful when using a pair

of the A4300’s channels to drive left channel

speakers only and the other pair of the A4300’s

channels to drive right channel speakers only.

2) Left + Right Channel Information:

When bridged and fed by a stereo input, a pair

of the A4300’s channels will automatically

combine the left and right channels into a

summed mono (left + right) channel. This

option is useful when using a pair of the

A4300’s channels to drive a subwoofer system

or a summed mono center channel.

JL AUDIO A4300 9

BASS BOOST CONTROLS

1) “CH 3&4 Bass Boost”: Found in the “Channel

3 & 4 Controls” section, this switch allows the

user to activate a 6 dB boost centered at 48 Hz

for channels 3 & 4. When the “CH 3&4 Bass

Boost” is activated, the inputs to “CH 3 (Left)”

and “CH 4 (Right)” are summed to create a

mono signal. The “Filter Mode” switch in the

“Channel 3 & 4” section must be in the “LP”

position for the bass boost to be functional.

2) “ Remote Bass Port”: This port allows you to

connect an optional remote boost knob (sold

separately as JL Audio Model RBC-1) that can

be mounted in the front of the vehicle. With

the RBC-1 connected, the boost is no longer

limited to 0 or +6 dB, allowing a variable

range of 0 to +12 dB of boost to be selected.

PREOUTS

The A4300 incorporates a pass-through

preamp output section, so that additional

amplifiers can be easily added to the system. This

pass-through pre-amp output can be configured

two different ways using the switch labeled

“Pre-Outs Input From”.

1) “1&2”: The preamp output delivers the same

signal that is connected to the CH 1&2 Inputs.

This mode is useful for feeding a subwoofer

amplifier when the A4300 is being used to

drive front and rear speaker systems. In this

mode, the preamp output signal will depend

only on the input signal level of CH 1&2,

allowing Channels 3&4 to be faded without

affecting the subwoofer level. If CH 1&2 is

faded in this mode, the signal level of the

preamp output will change accordingly.

2) “Sum”: When the A4300 is being used to drive

front and rear speaker systems, this preamp

output mode will deliver a summed front/rear

stereo signal to a subwoofer amplifier, while

permitting fading of the front and rear speaker

systems from the source unit. This method

prevents a loss of signal to the subwoofer

amplifier when the system is faded to the front

or the rear by the head unit.

Note: Any signal delay between the front and rear

channels can result in a cancellation of signals

within certain frequency ranges when using the

“Sum” position. If you experience a loss of bass

output in the “Sum” position, compared to the

“1&2” position, you are likely dealing with a

delayed signal in either the front or rear outputs

of the source unit. If the front to rear delay is

desirable for other reasons or if it cannot be

defeated at the source unit, we recommend that

you use the “1&2” position.

Note: In either mode, the preamp output signal

is not affected by the “CH 3&4 Bass Boost”

processing selected for the amplifier or by any

crossover filter selected (if the input signal is full-

range, the preamp output will be full-range).

Note: The signal level of the “Preamp Output” is

line-level (low voltage), regardless of the position

selected in the A4300’s “Input Voltage” switch.

An additional amplifier connected to these

preamp outputs should have its input voltage

switch set to the “Low” position.

8 JL AUDIO A4300

JL Audio A4300 Seite 5

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