Speaker Outputs; Bridging Considerations; Status Led / Protection Circuitry - JL Audio XD 800/8v2 Owner's Manual

sPeaker outPuts

The XD800/8v2'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 XD800/8v2'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.
Remote
Level
Control
CH. 1 CH. 2 CH. 3 CH. 4 CH. 5 CH. 6 CH. 7
(L) (R) (L) (R) (L) (R) (L)
&6 CH. 7&8
Bridged Bridged Bridged
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 XD800/8v2 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 pair will deliver optimum
power into a single 4 ohm load.
10 | JL Audio - XD800/8v2 Owner's Manual
When a pair of 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.
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
8 Channel Amplifier
can cause the amplifier to overheat.
Do not do this!
When a pair of the XD800/8v2's channels are
2 Ch. Input 1 feeds CH. 1, CH. 3, CH. 5 & CH. 7
operating in bridged mode, the output will be in
4 Ch. Input 1 feeds CH. 1 & CH. 3
mono (only one channel). This mono channel
can contain right channel only information,
8 Ch. Each input feeds its
+12 VDC Ground Remote
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,
CH. 8
(R)
Bridged
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 XD800/8v2'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 XD800/8v2's channels to drive left
channel speakers only and another pair of the
XD800/8v2'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 XD800/8v2'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
XD800/8v2's channels to drive a subwoofer
system or a summed mono center channel.

status led / ProteCtion CirCuitrY

There is a single multi-color LED on the top
surface of the amplifier to indicate the amplifier's
operating status.
Turn-On
Mode
Rem. | O set | Signal
Input Voltage
Low | High
1) Flashing Green: amplifier is powering up,
INPUT MODES:
audio output is muted.
Input 2 feeds CH. 2, CH. 4, CH. 6 & CH. 8
CH. 1 CH. 3 CH. 5 CH. 7
Input 2 feeds CH. 2 & CH. 4
2) Constant Green: amplifier is on and
Input 5 feeds CH. 5 & CH. 7
Input 6 feeds CH. 6 & CH. 8
CH. 2 CH. 4 CH. 6 CH. 8
functioning normally, audio output is active.
corresponding output channel
3) Constant Red: Indicates that the
amplifier has exceeded its safe operating
temperature, putting the amplifier into a
self-protection mode, which reduces the
peak power output of the amplifier. When its
temperature returns to a safe level, the red
light will return to green and the amplifier will
return to full-power operating mode.
4) Constant Amber (yellow): Indicates
that an over-current condition has occurred
and is accompanied by a muting of the affected
channel(s). Because the muting behavior may be
very short in duration, it may manifest itself as
an audible, repetitive ticking noise in the output.
Over-current conditions can be caused by a
speaker impedance lower than the optimum load
impedance range for the amplifier or a short-
circuit in the speaker wiring. The latter can result
from a short circuit between the positive and
negative speaker wires or between either speaker
wire and the vehicle chassis. The "Status LED"
will remain amber for a few seconds, even if the
over-current condition is of a very short duration.
This functionality can be used to diagnose a
short-circuit by only connecting one channel at
a time. The "Status LED" will turn amber when
you connect the channel that is experiencing
the problem and turn the volume up.
5) LED off / Amplifier Shuts Off Unexpectedly
The only condition that will shut down
an undamaged XD800/8v2 completely is if
battery voltage or remote turn-on voltage drops
below 10 volts. The "Status LED" will turn off
when this occurs. The amplifier will turn back on
when voltage climbs back above 11 volts. If this
is happening in your system, have your charging
system and power wiring inspected.
Remote
CH. 1 & 2 CH. 3 & 4
For more information on troubleshooting this
Level Input Input
Mode Sens. Sens.
amplifier, refer to Appendix D (pages 16, 17).
All | 5- 8 | 7&8
Input Mode Filter Mode Filter Mode
2 Ch. | 4 Ch. | 8 Ch. O | HP | LP O | HP | LP
Filter Freq. (Hz)
(L)
(R)
CH. 1 CH. 2 CH. 3
(L) (R) (L)
CH. 5 & 6 CH. 7 & 8
Input Input
Sens. Sens.
Filter Mode Filter Mode
O | HP | LP O | HP | LP
Filter Freq. (Hz) Filter Freq. (Hz) Filter Freq. (Hz)
CH. 4 CH. 5 CH. 6 CH. 7
(R) (L) (R) (L)
11
CH. 8
(R)