Bedienungsanleitung JL Audio A2150 (Seite 5 von 11) (Englisch)

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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 the A2150 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 the A2150, use a “Y-Adaptor”

to split the single channel signal into both left

and right RCA inputs. This option is useful

when using one A2150 to drive left channel

speakers only and the other A2150’s channels

to drive right channel speakers only.

2) Left + Right Channel Information:

When bridged and fed by a stereo input, the

A2150’s channels will automatically combine

the left and right channels into a summed

mono (left + right) channel. This option is

useful when using the A2150 channels to

drive a subwoofer system or a summed mono

center channel.

AMPLIFIER STATUS INDICATOR LIGHTS &

PROTECTION CIRCUITRY

There are two status indicator lights on the

input / control end of the amplifier.

1) “Power” (Green): lights to indicate that the

amplifier is turned on and operating normally.

2) “Protect” (Red): Indicates that the amplifier

protection circuitry has been activated to

prevent product failure due to a short-circuit

or a dangerously low impedance connected

to the amplifier output(s). Connecting the

speaker outputs to an impedance lower than

2 ohms stereo (4 ohms bridged) will cause

this protection mode to activate. When this

protection mode is activated, the amplifier will

reduce it maximum power output to protect its

circuitry, which will manifest itself as increased

distortion. When the problem is corrected, the

amplifier will return to normal operation.

Advanced Rollback Thermal protection

Unlike conventional thermal protection

systems, which shut down an amplifier when it

overheats, this system protects the amplifier by

gradually reducing power output if the amplifier’s

safe operating temperature is exceeded. The

amplifier will continue to operate and return

to normal power output once its temperature

returns to a normal range.

JL AUDIO A2150 9

BASS BOOST CONTROLS

1) “Bass Boost”: This switch allows the user to

activate a 6 dB boost centered at 48 Hz.

When the “Bass Boost” is activated, the inputs

to “CH 1 (Left)” and “CH 2 (Right)” are

summed to create a mono signal. The “Filter

Mode” switch in the “Channel 1 & 2” 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 A2150 incorporates a pass-through

preamp output section, so that additional

amplifiers can be easily added to the system. The

preamp output delivers the same signal that is

connected to the A2150’s inputs.

The preamp output signal is not affected by the

“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).

The signal level of the “Preamp Output” is

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

selected in the A2150’s “Input Voltage” switch.

An additional amplifier connected to these

preamp outputs should have its input voltage

switch set to the “Low” position.

SPEAKER OUTPUTS

The A2150’s speaker outputs are designed to

accept 16 AWG - 8 AWG wire.

The A2150 is 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 in stereo or below 4 ohms nominal

bridged mono 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 A2150 has been designed

for bridging of its channels without the need for

input inversion adaptors.

To bridge the A2150’s two channels, use the

“CHANNEL 1 +” and “CHANNEL 2 –”

speaker connectors only (the “CHANNEL 1 –”

and “CHANNEL 2 +” remain unused). When

bridged, the A2150 will deliver optimum power

into a 4 ohm load.

8 JL AUDIO A2150

JL Audio A2150 Seite 5

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