JL Audio D108

The JL Audio D108 is an 8″ 500w active class D subwoofer with sealed enclosure.  It employs JL Audio’s exclusive DMA technology to produce higher output levels with reduced distortion, as well as improved dynamic tracking and resolution.


General Specifications

Enclosure TypeSealed
Enclosure FinishBlack Gloss
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 Displacement80 cu in / 1.3 L
Amplifier Power500 W RMS short-term
Power ModeAutomatic (Signal-Sensing)
Light ModesN/A

Signal Processing

Unbalanced InputsStereo or Mono (two RCA jacks)
Balanced InputsN/A
Speaker/High-Level InputsStereo or Mono (removeable plug)
Input GroundingIsolated or Grounded
Input ModesN/A
Level ControlVariable, from full mute to +15dB over reference gain
Filter Mode(s)Low-Pass
Filter Slope(s)24 dB/octave
Filter Frequency Range25 Hz – 130 Hz
Filter Defeat FunctionYes
Polarity0 or 180 degrees
PhaseVariable, 0- 280 degrees, referenced to 80 Hz
Extreme Low Frequency (E.L.F.) TrimN/A
Line OutputsN/A
Weight (kg)12
Dimensions (mm)254 x 289 x 336

Note: Height dimensions include feet. Depth dimensions include grilles.


JL Audio D108 Physical Specifications