Speaker Outputs - JL Audio NexD XD500/3 Owner's Manual

sPeaker outPuts

The XD500/3'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 the terminal, tighten
the set screw firmly, taking care not to strip the
head of the screw and making sure that the wire
(not the insulation) is firmly gripped by the wire
clamp in the terminal.
The XD500/3's main 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. The
subwoofer channel is designed to deliver power into
subwoofer loads equal to or greater than 2 ohms.
CH. 1 CH. 2
( L ) ( R )
Bridged
!
IMPORTANT
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.
10 | JL Audio - XD500/3 Owner's Manual
Mono Subwoofer 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 XD500/3 has been designed
for bridging of its main channel pair without the
need for input inversion adaptors.
To bridge the main channels, use the "Left +"
and "Right –" speaker connectors only (the "Left
–" and "Right +" remain unused). The bridged
channel pair will deliver optimum power into a 4
ohm load.
!
IMPORTANT
When the XD500/3's main channels are
bridged, they will deliver 200W x 1 into a 4
ohm load or 150W x 1 into an 8 ohm load.
Operating the bridged channels into a load
lower than 4 ohms is not recommended.
!
IMPORTANT
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 the XD500/3's main 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: