8-Channel Full-Range Amplifier: The JL Audio XD800/8v2 is
an eight-channel, Class-D amplifier utilizing NexD ultra-high speed switching
technology to deliver outstanding fidelity and efficiency. The amp can be operated
with a wide variety of source units and system configurations.
Specifications: The XD800/8v2 is rated at 75 watts RMS x
8-channels at 14.4 volts, measured into 4Ω from 20 Hz to 20 kHz with no
more than 1% THD+N. The bridged output is 200 watts RMS x 4-channels at 14.4
volts, measured into 4Ω from 20 Hz to 20 kHz with no more than 1% THD+N.
Each pair of channels (1&2, 3&4, 5&6, and 7&8) is independently
bridgeable, so the amp can be used in 8-channel, 7-channel, 6-channel, 5-channel,
and 4-channel mode. The 2Ω output is 100 watts RMS x 8-channels at 14.4 volts,
measured from 20 Hz to 20 kHz with no more than 1% THD+N. The Signal to Noise ratio
is 104 dB at rated power and 84 dB at 1 watt, both A-weighted, 20 Hz to 20 kHz.
NexD Class D Technology: NexD is a switching amplifier design
that combines exceptional audio quality with excellent efficiency and less complexity.
This results in an affordable compact amplifier with exceptional audio quality and
Advanced Rollback Protection: The XD-Series amplifiers employ
advanced thermal and low-impedance protection to virtually eliminate annoying amplifier
shut-down events. Should any XD-Series amplifier overheat, its intelligent, unregulated
power supply reacts by limiting available peak voltage until the amplifier returns to a
safe temperature range. Likewise, if an impedance lower than optimal for the amplifier
is present at the outputs, the XD amplifier will roll back peak voltage to protect
itself without shutting down.
Differential-Balanced Inputs: The amplifier features
differential-balanced input architecture to effectively control noise and
ensure compatibility with a wide variety of source units, including many
OEM systems. Without resorting to line output converters, you can directly
connect most OEM source units to the JL Audio amplifier without creating
any noise or compatibility issues. Unlike conventional single-ended inputs,
the differential-balanced design does not connect one side of the audio signal
to chassis ground. This eliminates any voltage sensitivity between one input
terminal and ground and greatly reduces the incidence of alternator whine in
a typical car audio installation.
Note: You will need up to four speaker wire to RCA adaptors
(136XDCLR2S, sold separately) to connect this amplifier to your headunit via
Protection Circuitry with Status LED: There is a single multi-color
LED on the top panel to indicate the amplifier's operating status.
- Flashing Green: amplifier is powering
up and audio output is muted
- Constant Green: amplifier is turned on
and operating normally
- Constant Red: indicates the amplifier
has exceeded its safe operating temperature, putting the
amplifier into a self-protection mode which reduces the
power output; the LED will return to green and the amplifier
will resume normal, full-power operation when the heat sink
temperature drops back to a safe level
- Constant Amber (Yellow): indicates an
over-current condition has occurred, accompanied by a muting
of the affected amplifier channels (over-current can be caused
by speaker impedance lower than recommended or a short-circuit
in the speaker wiring)
- LED Off: the only condition that will
shut down an undamaged XD800/8v2 completely is the battery
voltage or remote turn-on voltage dropping below 10-volts
Cooling System: The outer shell of the JL Audio amplifier
is designed to remove heat from the amplifier circuitry. For optimum cooling
performance, this outer shell should be exposed to as large a volume of air as
possible. Enclosing the amplifier in a small, poorly ventilated chamber can lead
to excessive heat build-up and degraded performance.
Control Panel Cover: The XD800/8v2 features a Control Panel
Security Cover which protects and hides the amplifier's controls. When installed,
the cover ensures that the amplifier's settings are not accidentally changed, while
creating a clean aesthetic look for the amplifier and your installation. The cover
is installed at the factory and must be temporarily removed for access the amplifier's
controls. The security cover is secured by two 2.5mm Allen-head machine screws.
Gain Setting: The XD Series amplifiers have independent gain
(input sensitivity) controls for each pair of output channels; in this case,
1&2, 3&4, 5&6, and 7&8. Using JL Audio's guided set up requires
a digital AC voltmeter and a test CD (item number
503CD104, sold separately) with a sine-wave test-tone recorded at 0 dB reference
level in the frequency range to be amplified for that set of channels (50 Hz for
subwoofer channels, 1 kHz for a midrange application).
Input Voltage: The input voltage range is broken into two
sub-ranges (the sub-range is set simultaneously for all inputs, but each pair
of channels has an independent gain control to set the specific voltage):
- Low: typically used with preamp level
signals; variable from 200mV to 2V
- High: used with some high output preamps
and most speaker level signals; variable from 800mV to 8V
Remote Level Mode: When the optional HD-RLC wired remote is
added, use this switch to set which channels are affected:
- All: all channels are adjusted
- 5-8: channels 5, 6, 7, and 8 are
- 7&8: only channels 7 and 8
Turn-On Mode: There are three options for turning the amp
on, selected using the Turn-On Mode switch:
- Remote: The amp turns on when +12 volts
is applied to the remote terminal.
- Offset: The amp turns on when a DC offset
is detected on the channel 1 inputs (from a speaker-level source).
- Signal: The amp turns on when a full-range
audio signal is detected on the channel 1 input (from a speaker-level
Choose which inputs are used with this three position
- 8 CH: each of the eight inputs
feeds its corresponding output
- 4 CH: input 1 feeds output channels 1
and 3; input 2 feeds output channels 2 and 4; input 5 feeds
output channels 5 and 7; input 6 feeds output channels 6 and
- 2 CH: input 1 feeds the odd numbered
output channels; input 2 feeds the even numbered output
Crossovers: Each pair of channels (1&2, 3&4, 5&6,
and 7&8) has an independent crossover, with its own mode and frequency adjustments
under the removable cover plate:
- Filter Mode: three position switch;
select Low Pass, High Pass, or Full-Range operation
- Filter Frequency: rotary control; set
the crossover point from 50 to 500 Hz
Power/Ground/Turn-On Terminals: The amplifier features screw
clamp terminals for the power, ground, and remote turn-on connections.
- Power and Ground: designed to accept
4 AWG wire; a A 2.5mm Allen wrench is supplied for making
- Remote Turn-On: designed to accept 18
to 8 AWG wire; the same 2.5mm Allen wrench is used for making
Note: The Amplifier is not equipped with a fuse. An
external 80-amp fuse (not included) must be installed on
the power wire. If a wiring kit is used which includes a fuse with a value
other than 80-amps, the original should be replaced with an 80-amp fuse.
Speaker Output Terminals: The XD800/8v2's sixteen screw clamp
speaker terminals will accept 16 to 8 AWG speaker wire. The included 2.5mm Allen
wrench is used for making connections.
Preamp Inputs: The amplifier has four pair of
differential-balanced RCA jack inputs; each pair has a dedicated gain control
designed to match the input sensitivity of the amp to the specific signal source
feeding it. In addition to preamp level signals, the RCA inputs are also used
with speaker level signals (136XDCLR2S
required and sold separately).
Remote Level Control: The amplifier features an RJ-14
telephone jack for adding an optional wired remote level control. With the
addition of the optional wired remote (item number
136HDRLC, sold separately), you can control the volume of 2, 4, or all 8
channels of the XD800/8v2 from the front of your vehicle. This is useful for
subwoofer level control or even as a master volume control for your system.
If desired, multiple XD amplifiers can be controlled from a single HD-RLC
controller using a simple phone line splitter and multiple phone cables (all
Note: All inputs and outputs are located
on one side of the amplifier to make installation simple and