Dominion Series Powered Sub: JL Audio's Dominion series powered
subwoofers combine a state-of-the-art subwoofer driver and an advanced Class D
amplifier to deliver unmatched performance and value for a wide variety of music
and movie applications.
8" Long-Excursion Woofer: The JL Audio Dominion series
d108 sub houses an
8" long-excursion woofer. The woofer has been purpose-built to reproduce
powerful low-frequencies with stunning impact and precision. The 8" driver
employs JL Audio's exclusive DMA (Dynamic Motor Analysis) technology to produce
higher output levels with reduced distortion, as well as improved dynamic
tracking and resolution. As a result, the 8" woofer is capable of peak-to-peak
excursions well in excess of 2.5" (63mm), without distress or audible
- DMA Technology: JL Audio's exclusive DMA technology is
applied to shape, control, and stabilize the woofer' motor strength,
ensuring linear behavior over a very long excursion range. Unlike typical
steady-state modeling systems, JL Audio's approach takes into account the
dynamic shifts created by current flow and back EMF under real power
conditions, with real program material. The payoff offered by DMA
optimization is a subwoofer that more faithfully tracks its input signal at
all listening levels, leading to superior bass definition and dynamics.
- Floating Cone Attach Method (FCAM): This assembly
technique, conceived by JL Audio, ensures proper surround geometry in the
assembled speaker for better excursion control and dynamic voice coil
- Vented Reinforcement (VRC): JL Audio's patented Vented
Reinforcement Collar (VRC) improves the rigidity and stability of the
cone/spider/voice coil junction and directs airflow over the voice coil
windings for improved thermal performance. T
- Engineered Lead-Wire System: Carefully engineered
lead-wire design and attachments ensure controlled, quiet lead-wire behavior
under the most extreme excursion demands.
500W Class D Amplifier: The JL Audio d108 powered subwoofer
employs an advanced 500W Class D amplifier in order to extract the most from the
long-excursion 8" driver. This design features a tightly regulated switching
power supply, allowing the amplifier to generate prodigious amounts of unclipped
output voltages. These technologies ensure that the Dominion series powered sub
remains in its comfort zone, which is well beyond the point where most small
subwoofers run out of power or driver capability.
Sealed MDF Cabinet: To contain the immense pressures created by the
powered sub's 8" long-excursion driver, the beautifully crafted cabinet is carefully engineered and
constructed using solid, CNC-cut, MDF material with extensive internal bracing
and advanced assembly techniques. The cabinet utilizes an acoustic suspension
(sealed) design for tight, accurate, natural sound bass.
Controls: The JL Audio d108 powered subwoofer
provides a variety of controls to fine-tune the sub to your room application and
source content. The controls are found on the rear-panel of the powered sub.
- Volume Level: The
"Master Level" Knob is used to set the output level of the powered sub
relative to the rest of your audio system. When rotated fully counter
clockwise, the sub's output will be fully muted. When at the "0" or straight
up position, the level is at reference gain. When turned fully clockwise,
the subwoofer's level is at its maximum sensitivity (loudest).
- Crossover: The powered sub's variable low-pass
crossover has a Linkwitz-Riley 24dB/octave slope with an adjustable
frequency range of 25Hz to 130Hz. The on-board crossover can be defeated for
home theater receiver's with an LFE output and its own built-in low-pass
- Polarity & Phase Control: A polarity switch (0/180°)
and phase control (0-280°) are
provided to aid in achieving an optimal acoustic transition between the
powered subwoofer and your main speakers.
Line-Level & Speaker-Level Inputs: Analog inputs are
provided for unbalanced line-level (RCA) signals or high-level (speaker)
signals. Using a rear-panel switch, the line level inputs can be configured as
grounded or isolated, which is very useful in combating ground-related noise
problems. For receivers with a mono subwoofer or "LFE" outputs, only one RCA
jack will be used (Left or Right). The speaker-level inputs consist of a
removable plug with four set-screw terminals that will fit speaker wire up to 14 AWG.
Optional Wireless Connectivity: Connect JL Audio's JLINK TRX system (136TRX,
sold separately) to the powered sub's onboard Wireless Link port and enjoy the
freedom to position the Dominion series powered subwoofer almost anywhere in
your room, up to 100' away from your receiver or preamp/processor. Using a JLINK
TRX will eliminate the need to run physical signal cables from your receiver or
preamp/processor's line-level outputs to the line-level inputs of the Dominion
series powered sub. Instead, the Dominion powered sub will wirelessly receive
audio signals through the JLINK TRX system's receiver plugged into the sub's
"Wireless Link port" from the JLINK TRX system's transmitter connected to your
receiver's or preamp/processor's LFE/sub output.
Auto Power On: The d108 powered subwoofer will power up its
internal amplifier when it detects an audio signal at any of its inputs, and
will power down the internal amplifier if no signal has been detected at its
inputs for approximately 30 minutes. The LED indicator will be Red when dormant
and Green when operational.
Placement: JL Audio recommends that you begin by placing the
JL Audio d108 powered subwoofer in the front of the room, on the floor, near the front
left or right speaker. Placing the Dominion series powered sub near solid walls will
reinforce bass response and pulling it away from solid walls will decrease bass.
Increasing the distance between the subwoofer and the walls may help to smooth
upper bass response in some rooms. JL Audio also recommends that you avoid
placing the powered subwoofer near windows to prevent rattling and sound
transmission to the outside world.
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