Bedienungsanleitung JL Audio XD400 (Seite 10 von 20) (Englisch)

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10 | JL Audio - XD400/4v2 Owner’s Manual

Note: When the “Input Voltage” switch is in its

“Low” position, the level of the “Preouts” signals

matches the input signal levels (unity gain). When

the “Input Level” switch is in the “high” position,

the level of the input signal is attenuated –12 dB

to produce a line level signal at the “Preouts”.

This ensures a proper line level signal output

under both conditions.

If you plan to use the “Preouts” to feed a stereo

amplifier, you must connect a stereo signal to

the input of the amplifier. A mono signal into

the amplifier will result in a mono signal out of

the preamp output.

SPEAKER OUTPUTS

The XD400/4v2’s speaker outputs are designed

to accept 16 AWG - 8 AWG wire. To connect the

speaker wires to the amplifier, first back out the

set screws on the top of the terminal block, using

the supplied 2.5 mm hex wrench. Strip 1/2 inch

(12 mm) of insulation from the end of each wire

and insert the bare wire into the terminal block,

seating it firmly so that no bare wire is exposed.

While holding the wire in place, tighten the set

screw firmly, taking care not to strip the head of

the screw.

Each pair of the XD400/4v2’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 (or 4 ohms bridged) 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 XD400/4v2 has been designed

for bridging of its main channel pairs without the

need for input inversion adaptors.

To bridge a pair of main channels, use the

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

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

bridged channel pair will deliver optimum power

into a 4 ohm load.

When a pair of the XD400/4v2’s channels are

bridged, they will deliver 200W x 1 into a 4 ohm

load or 150W x 1 into an 8 ohm load. Operating

a pair of bridged channels into a load lower than

4 ohms is not recommended.

A bridged pair of channels requires that

both channels in the pair receive input. You

must connect the mono or stereo source signal

to both the left and right inputs of the bridged

channel pair. 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 XD400/4v2’s channels are

operating in bridged mode, the output will be in

mono (only one channel). This mono channel can

contain only right channel information, only left

channel information, or the sum of the signals

from right and left input 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 XD400/4v2’s

channels you must use a “Y-Adaptor” to split

the single channel signal into both left and

right RCA inputs of the bridged channel

pair. This option is used when deploying a

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