JL Audio IWS sys-108

In-wall powered subwoofer System

The JL Audio IWS Sys-108 is a concealed in-wall subwoofer system which delivers remarkable bass performance for most home audio/theatre environments.

The 8-inch IWS systems are smaller and easier to integrate than their larger in-wall Fathoms system.  They fit in all standard, 16-inch, on-centre stud openings and operating through very small grilles. These grilles accommodate all common drywall thicknesses, and can be easily painted to match the wall.

The IWS-108 System fits 2″ x 4″ wall studs or larger.


General Specifications – JL Audio IWS

Enclosure TypePorted
Enclosure FinishBlack texture-coated
Frequency Response (Anechoic)24.9 Hz – 109 Hz(±1.5dB)
-3 dB at 24.6 Hz / 111 Hz
-10 dB at 23.4 Hz / 118 Hz
Effective Piston Area (Sd)31.62 sq in / 0.0204 sq m
Effective Displacement47.5 cu in / 0.78 L
Amplifier Power300W RMS short-term
Power ModeOff, on or Automatic (Signal-Sensing or 12V trigger)
12v trigger Output Capacity150mA (1/8-inch/3.5mm mini jack)

Signal Processing & Physical Specifications

Unbalanced InputsStereo or Mono (two RCA jacks – Input impedance of 40k Ohms)
Balanced InputsStereo or Mono (removable plug – Input Impedance of 4.4k Ohms)
Line OutputsStereo or Mono (two RCA jacks – Pass-Through or High-Pass)
Input GroundingIsolated or Grounded
Calibration ModesDigital Automatic room optimisation, requires microphone (sold separately)
Level ControlReference (fixed gain) or Variable, from -50dB to +15dB over reference gain (0.5dB increments)
Filter Mode(s)Low-Pass, with tracking High-Pass Outputs
Filter Slope(s)12/24 dB/octave
Filter Frequency Range30 Hz – 130 Hz
Filter Defeat FunctionYes
Polarity0 or 180 degrees
Delay PhaseVariable, 0- 25ms (0.1ms increments, sub and HP outputs)
Extreme Low Frequency (E.L.F.) TrimVariable, -12 dB to +3 dB at 25 Hz (0.5dB increments)
Subwoofer OutputsNeutrick speakOn 2-Pole connectors (uses Neutrik part: NL2FX)
Equalizer Bands/Freq Range3 / 20 to 160Hz (1 Hz increments)
Equalizer Gain Range/Q Range-12dB to + 12dB (0.2dB increments) / 0.7 to 5.0 (0.1 increments)



2 x 4″ Wall Stud Enclosure Physical Specifications


Wall Cavity Width (W)Minimum: 365 mm Maximum: 394 mm
Wall Cavity Height (H)Minimum: 1,905 mm
Width (W)355 mm
Height (H)1,565 mm
Depth (D)83 mm
Note: Enclosure dimensions do not include L-brackets or vibration-dampening padding.

Amplifier Physical Specifications

Width (W)428 mm
Height (H)44 mm
Depth (D)346 mm
Net Weight6.12 kg
Note: Single Rack Unit – Amplifier Height Dimensions do not include feet.

Grille Physical Specifications

Grille Height (H)267 mm
Wallboard Thickness Compatibility13 mm to 44 mm
Grille Width (W)267 mm
Wall Opening Height (H)248 mm
Wall Opening Width (W)248 mm