JL Audio Fathom ICS-SYS-108 In-ceiling Subwoofer


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In-Ceiling Subwoofer System with Single 8-inch Subwoofer Driver, 300 watts

Created from the same innovative technologies used to develop our free-standing powered subwoofers, the Fathom® ICS in-ceiling subwoofer systems are engineered to deliver outstanding bass performance, with nearly unlimited placement freedom.

Purpose-built to disappear into the ceilings of most home audio/theatre environments, the 8-inch Fathom® ICS systems are designed to fit 2" x 6" or larger ceiling joists and a wide range of assembled joist widths while operating through very small grilles. The grille’s clever design accommodates all common drywall thicknesses and can be easily painted to match a room’s decor.


The subwoofer enclosures utilize extensive architectural features aimed at improving rigidity while keeping a very low profile and minimal wall thickness. Unique port design vents through a slot located at the perimeter of the driver mount to enhance efficiency and low-bass output. Inside the enclosure is a long-excursion, 8-inch thin-line woofer, built to exacting standards by JL Audio for the Fathom® ICS products.

Each 8-inch Fathom® ICS system is driven by a rack-mountable amplifier with up to 600 watts of clean power, programmed specifically for each system, and capable of driving up to two enclosures. A complete set of Fathom® signal processing features is also onboard, including our powerful, 18-band Digital Automatic Room Optimization (D.A.R.O.) system, and high-pass crossover outputs, all accessible via an easy-to-use, menu-driven interface and LCD display. Note: D.A.R.O. functionality requires an optional calibration microphone (sold separately).

The ICS-108 System fits 2" x 6" ceiling joists or larger, with assembled joists ranging from 16-inches to 25 1/2-inches on center. Consult your Authorized JL Audio Dealer for specific application information.


Enclosure Type: Ported

Enclosure Finish: Black Texture-Coated

Frequency Response (Anechoic): 24.9 Hz - 109 Hz (± 1.5 dB) -3dB at 24.6 Hz / 111 Hz -10dB at 23.4 Hz / 118 Hz

Effective Piston Area (Sd): 31.62 sq in / 0.0204 sq m

Effective Displacement: 47.5 cu in / 0.78 L

Amplifier Power: 300 W RMS short-term

Power Mode(s): Off, On or Automatic (Signal-Sensing or 12V Trigger)

12V Trigger Output Capacity: 150 mA (1/8-inch/3.5mm mini jack)

Light Modes: N/A


Joist/Stud Cavity Width (W): Minimum: 16 in / 406 mm
Maximum: 25.5 in / 648 mm (on center)
Joist/Stud Cavity Height (H): Minimum: 58 in / 1,473 mm
Width (W): 14 in / 355 mm
Height (H): 40.71 in / 1,034 mm
Depth (D): 5.13 in / 130 mm
Note: Enclosure dimensions do not include L-brackets or vibration-dampening padding.

The JL Audio Fathom In Ceiling Subwoofer System

The overall performance of the JL ICS is impressive on every level. It provides powerful bass response, great musicality, and can rock the house when necessary. And for those with smaller living quarters, that can’t make the space for a larger JL product; the ICS is the perfect solution. more...

Due to the bespoke nature of our high-end music systems this product is not available to be purchased online. Please contact us for personalized service from one of our team of experts.