Bedienungsanleitung JL Audio A6450 (Seite 5 von 11) (Englisch)

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SPEAKER OUTPUTS

The A6450’s speaker outputs are designed to

accept 16 AWG - 8 AWG wire.

Each pair of the A6450’s channels are designed to

deliver power into speaker loads equal to or greater

than 2 ohms when using a “stereo” configuration

and speaker loads equal to or greater than 4 ohms

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 A6450 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 A6450’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 A6450’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 A6450’s channels to drive left channel

speakers only and the other pair of the A6450’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

A6450’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 A6450’s

channels to drive a subwoofer system or a

summed mono center channel.

JL AUDIO A6450 9

“LP” (Low-Pass): Configures the filter to

attenuate frequencies above the selected filter

frequency at a rate of 12dB per octave. This is

useful for connection of subwoofer(s) to one

or more of the A6450’s channel pairs in a

bi-amplified system.

“HP” (High-Pass): Configures the filter to

attenuate frequencies below the selected filter

frequency at a rate of 12dB per octave. This is

useful for connection of component speakers to

one or more of the A6450’s channel pairs in a

bi-amplified system.

2) “Filter Freq. (Hz)” The filter frequency

markings surrounding this rotary control

are for reference purposes and are generally

accurate to within 1/3 octave or better. If you

would like to select the filter cutoff frequency

with a higher level of precision, consult the

chart in Appendix B (page 15).

Tuning Hi nt: If you are using the A6450 to drive

a subwoofer system (“LP” mode), a component

satellite speaker system (“HP” mode) or both,

80 Hz is a good baseline “Filter Freq. (Hz)”

setting. After properly adjusting the “Input

Sens.”, as outlined in Appendix A (page 14), you

can fine tune the “Filter Freq. (Hz)” control to

achieve the desired system frequency response.

BASS BOOST CONTROLS

1) “Bass Boost”: Found in the “Channel 5 & 6

Controls” section, this switch allows the user

to activate a 6 dB boost centered at 48 Hz

for channels 5&6. When the “Bass Boost” is

activated, the inputs to “CH 5 (Left)” and “CH

6 (Right)” are summed to create a mono signal.

The “Filter Mode” switch in the “Channel

5 & 6 Controls” 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.

8 JL AUDIO A6450

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