JL Audio D-Sub D108 8-inch 500-watt Subwoofer

JL AudioSKU: D108ASH

Color: Black Ash
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Dominion™ d108-ASH: 8-inch (200 mm) Powered Subwoofer


Dominion™ d108-ASH

  • Powered Subwoofer with 8-inch Subwoofer Driver, 500 watts

Born from JL Audio’s vast collection of advanced technologies, Dominion™ 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 compact applications.
Purpose-built to reproduce powerful low-frequency events with stunning impact and precision, the Dominion™ 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, Dominion™ subwoofers are capable of peak-to-peak excursions well in excess of 2.5-inches (63 mm - d108), and 2.7 inches (68 mm – d110), without distress or audible distortion.

Dominion™ amplifiers utilize an advanced Class D design in order to extract the most from the long-excursion driver platform. 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™ powered subwoofers remain in their comfort zone, which is well beyond the point where most small subwoofers run out of power or driver capability.

With a host of signal processing features included, Dominion™ powered subwoofers can be integrated into most systems with ease. Low-pass signals are precisely guided, thanks to the onboard crossover’s 24 dB/octave Linkwitz-Riley alignment. Phase and polarity controls are onboard to aid in achieving the optimal acoustic transition between the subwoofer(s) and main speakers. Flexible input options are on-hand to accept either line-level or speaker-level signals. Connect a JLINK™ TRX system (sold separately) to the onboard Wireless Link port and enjoy the freedom to position your Dominion™ almost anywhere, up to 100 feet (30 meters) away from your source unit.

To contain the immense pressures created by the Dominion™ driver, each beautiful cabinet is carefully engineered and constructed using solid, CNC-cut, MDF material with extensive internal bracing and advanced assembly techniques. All Dominion™ powered subwoofers are built with pride and precision in JL Audio’s U.S. factory to deliver years of listening enjoyment.

  • Enclosure Type


  • Enclosure Finish

Black Ash

  • Frequency Response (Anechoic)

31 - 112 Hz (±1.5dB)
-3 dB at 29 Hz / 119 Hz
-10 dB at 21 Hz / 143 Hz

  • Effective Piston Area (Sd)

32.18 sq in / 0.0208 sq m

  • Effective Displacement

80 cu in / 1.3 L

  • Amplifier Power

500 W RMS short-term

  • Power Mode

Automatic (Signal-Sensing)

  • Light Modes


Signal Processing 

  • Unbalanced Inputs

Stereo or Mono (two RCA jacks)

  • Balanced Inputs


  • Speaker/High-Level Inputs

Stereo or Mono (removeable plug)

  • Input Grounding

Isolated or Grounded

  • Input Modes


  • Level Control

Variable, from full mute to +15dB over reference gain

  • Filter Mode(s)


  • Filter Slope(s)

24 dB/octave

  • Filter Frequency Range

25 Hz - 130 Hz

  • Filter Defeat Function


  • Polarity

0 or 180 degrees

  • Phase

Variable, 0- 280 degrees, referenced to 80 Hz

  • Extreme Low Frequency (E.L.F.) Trim


  • Line Outputs


  • Output to Slave


  • Calibration Mode


Physical Specifications

  • Width (W)

10 in / 254 mm

  • Height (H)

11.37 in / 289 mm

  • Depth (D)

13.23 in / 336 mm

  • Net Weight

26.4 lb / 12 kg













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