In-Ceiling Subwoofer System with Dual 8-inch Subwoofers, 600 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/theater 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. A 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 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 Finish: Flat Black (hidden from view when installed)

Grille finish: Primer White (paintable)

Enclosure Construction: CNC-Cut Birch Plywood

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)	63.24 sq in / 0.0408 sq m
Effective Displacement	95.0 cu in / 1.56 L
Amplifier Power	600 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

Unbalanced Inputs	Stereo or Mono (two RCA jacks - Input Impedance of 50k Ohms)
Speaker/High-Level Inputs	Stereo or Mono (removable plug - Input Impedance of 4.4k Ohms)
Input Grounding	Isolated or Grounded
Level Control	Reference (fixed gain) or Variable from -50dB to +15dB over reference gain (0.5 dB increments)
Filter Mode(s)	Low-Pass, with tracking High-Pass Outputs
Filter Slope(s)	12/24 dB/octave
Filter Frequency Range	30 Hz - 130.1 Hz
Filter Defeat Function	Yes
Polarity	0 or 180 degrees
Delay (Phase)	Variable from 0 – 25 ms  (0.1 ms increments, Sub and HP outputs)
Extreme Low Frequency (E.L.F.) Trim	Variable, -12 dB to +3 dB at 25 Hz (0.5 dB increments)
Line Outputs	Stereo or Mono (two RCA jacks - Pass-Through or High-Pass)
Subwoofer Outputs	Neutrik speakOn® 2-Pole Connectors (uses Neutrik part: NL2FX)
Calibration Mode	Digital Automatic Room Optimization (D.A.R.O.), requires microphone (sold separately)
Equalizer Bands	3
Equalizer Frequency Range	20 to 160 Hz (1 Hz increments)
Equalizer Gain Range	-12 dB to +12 dB (0.2 dB increments)
Equalizer Q Range	0.7 to 5.0 (0.1 increments)

Lineart Top-View and Side-View of ICS Subwooofer for 2 by 6-inch studs with Height (H), Width (W) and Depth (D) dimension labels

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.

Lineart Back Panel, Front Panel and Top-View of SA-600W Amplifier with Height (H), Width (W) and Depth (D) dimension labels

Width (W)	16.84 in / 428 mm
Height (H)	1.75 in / 44 mm
Depth (D)	13.63 in / 346 mm
Net Weight	13.5 lb / 6.12 kg
Note: Single Rack Unit - Amplifier Height Dimensions do not include feet.

Lineart Grille Front and Wall Opening views for IWS and ICS Grille with Height (H) and Width (W) dimension labels

Grille Height (H)	10.50 in / 267 mm
Wallboard Thickness Compatibility	0.5 in to 1.75 in / 13 mm to 44 mm
Grille Width (W)	10.50 in / 267 mm
Wall Opening Height (H)	9.75 in / 248 mm
Wall Opening Width (W)	9.75 in / 248 mm

Digital Automatic Room Optimization (D.A.R.O.)

Summary:
JL Audio's exclusive D.A.R.O. technology uses a powerful on-board DSP to automatically optimize the subwoofer's in-room frequency response. This leads to a superb listening experience, no matter where the subwoofer is placed.

Detailed Information:
In typical listening spaces, subwoofer and listener placement have a profound effect on the accuracy of low-frequency reproduction. While we always recommend that you place your subwoofers in good-sounding locations, we know that these often can be impractical locations. In the real world, subwoofer placement almost always involves a compromise between sonic performance, practicality and aesthetics.

To face this dilemma head on, JL Audio subwoofer systems incorporate a clever piece of technology called Digital Automatic Room Optimization (D.A.R.O.). The D.A.R.O. system self-generates a series of calibration tones, measures the frequency response at the listening position, and automatically configures an 18-band, 1/6 octave equalizer for a flat end-result. The system effectively allows for smooth, well-balanced sub-bass from a variety of locations that would have been less than ideal without D.A.R.O.

To perform this audio magic, all you have to do is:

Connect the included calibration microphone to the front panel of the subwoofer.
Press the calibrate button on the front panel of the subwoofer.
Hold the microphone at the primary listening position for about a minute.
A few minutes later, you have completed this one-time setup routine.

You won't need a computer, spreadsheets or complex measurement equipment, and you won't need to navigate and manipulate complicated interfaces… D.A.R.O. is a fine example of technology in the service of man, if there ever was one.

Read a review of the D.A.R.O. feature on Acoustic Frontiers

Dynamic Motor Analysis - DMA Optimized Motor

Summary:
JL Audio's proprietary Dynamic Motor Analysis system is a powerful suite of FEA-based modeling systems, first developed by JL Audio in 1997 and refined over the years to scientifically address the issue of speaker motor linearity. This leads to vastly reduced distortion and faithfully reproduced transients... or put simply: tight, clean, articulate bass.

Detailed Information:
Since 1997, JL Audio has been at the forefront of Finite Element Analysis-based modeling of loudspeaker motors and suspensions. This research is aimed at decoding what we refer to as the "Loudspeaker Genome"... a project aimed at understanding the true behavior of loudspeakers under power and in motion. A major component of this integrated system is DMA (Dynamic Motor Analysis). Starting with the 15W3 and the W7 Subwoofers in the late 1990's and early 2000's, DMA has played an important role in the design of all JL Audio woofers sold today, including our component woofers.

DMA is a Finite Element Analysis (FEA)-based system, meaning that it takes a large, complex problem, breaks it down into small solution elements for analysis and then assembles the data to form an accurate, "big-picture" solution. DMA's breakthrough is that it actually considers the effects of power through the coil as well as coil/cone position within the framework of a time-domain analysis. This gives us a highly accurate model of a speaker's actual behavior under real power, something that the traditional Thiele-Small models or other low power measurements cannot do. Because DMA does not rely on a steady-state model, it is able to consider shifts in the circuit elements being analyzed. These modeling routines are intense, requiring hours to run for a whole speaker.

DMA is able to analyze the real effects of fluctuating power and excursion upon the magnetic circuit of the motor, specifically the dynamic variations of the "fixed" magnetic field. This delivers intensely valuable information compared to traditional modeling, which assumes that the "fixed" field produced in the air gap by the magnet and the motor plates is unchanging. DMA not only shows that this "fixed" field changes in reaction to the magnetic field created by current flowing through the voice coil, but it helps our engineers arrive at motor solutions that minimize this instability. Analyzing this behavior is critical to understanding the distortion mechanisms of a speaker motor and sheds light on the aspects of motor design that determine truly linear behavior:

Linear motor force over the speaker's operational excursion range
Consistent motor force with both positive and negative current through the coil
Consistent motor force at varying applied power levels

Our ability to fully analyze these aspects of motor behavior allows our transducer engineers to make critical adjustments to motor designs that result in extremely linear, highly stable dynamic loudspeaker motor systems.

The payoff is reduced distortion, improved transient performance and stellar sound quality.

Floating Cone Attach Method - FCAM™

Summary:
This assembly technique, conceived by JL Audio, ensures proper surround geometry in the assembled speaker for better excursion control and dynamic voice coil alignment.

Detailed Information:
JL Audio's patented FCAM™ technology is an innovative method of bonding the surround/cone assembly to the voice coil former/spider assembly. This feature helps ensure concentricity of the surround, spider and voice coil without torquing the suspension to achieve it. This allows for the inevitable, slight variations in production part dimensions without having them negatively impact the integrity of the suspension and coil-centering at high excursions.

Concentric Tube Suspension

Summary:
Our Concentric Tube Suspension™ technology delivers unprecedented excursion in a low-profile woofer.

Detailed Information:
The biggest challenge in any low-profile woofer design is to create enough mechanical clearance for the speaker to generate enough excursion to meet its output and low-frequency extension goals. Since these goals were very ambitious in the development of JL Audio's low profile woofers, achieving them required development of a new suspension architecture.

JL Audio's solution employs a molded structure which spans over the edge of the motor system, supporting the spider on the outside of the motor's boundaries and the large diameter voice coil on the inside. The large diameter voice coil permits the magnet to sit inside it, rather than surrounding the coil as is typical in most woofers.

Concentric Tube Sub-Assembly of a 13TW5v2

The concentric tube structure and the elimination of a conventional top-plate helps us place the motor system higher up into the cone body's space to further compress depth, while still permitting excellent mechanical excursion.

High-Damping Feedback Circuitry

Summary:
This proprietary, discrete control circuit design allows our Class D switching amplifiers to maintain an excellent damping factor for improved transient behavior and fidelity.

Detailed Information:
While Class D amplifiers are well known for outstanding efficiency, they have also been known for less than spectacular sound quality due to weak damping of the driven load and poor power regulation. These factors are critical to subwoofer fidelity as they relate directly to the amplifier's ability to control the motion of the speakers.

JL Audio's Patented Class D output circuit utilizes a discrete control section and a unique feedback loop design that results in outstanding power regulation with a damping factor that's vastly higher than other Class D designs and also higher than most Class A/B amplifiers. The benefit of this exclusive JL Audio technology is tight, clean bass reproduction with the efficiency advantage of Class D.

It is a package tailor-made for world-class bass performance.

Built in U.S.A. with Global Components

Summary:
JL Audio's Miramar, Florida loudspeaker production facility is one of the most advanced in the world.

Detailed Information:
At a time when most audio products are built overseas, JL Audio’s commitment to in-house loudspeaker production continues to grow. To pull this off in a competitive world market, our production engineering team has created one of the world’s most advanced loudspeaker assembly facilities and established a global network of quality component suppliers who build to our specifications. This, combined with our commitment to state-of-the-art assembly technology, allows our skilled workforce to efficiently build JL Audio products to extremely high quality standards, right here in the U.S.A.

Since most of our premium loudspeakers incorporate proprietary, patented technologies requiring specific assembly techniques, we find it is vital that the people who designed them have close access to the people manufacturing them. The following JL Audio products are built in our Miramar, Florida factory, with global components:

Subwoofers: W7, W6v3, TW5v2, TW3, TW1, W3v3
Enclosed Car Subwoofers: Stealthbox®, PowerWedge™, ProWedge™, H.O. Wedge™ & MicroSub™ Enclosed Subwoofers
Marine Loudspeakers, Marine Subwoofers and Marine Enclosed Loudspeakers
Home Subwoofers: Dominion™, E-Sub, Fathom® and Gotham®

Download Fathom® ICS-SYS-208 Product Manual

Download Fathom® SA-600W Product Manual

Download Fathom® IWICE-108 Drawing (.dwg)

USA Limited Warranty: Three (3) years from the original date of purchaseWarranty Details

Find the answers to many common questions:

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"We gave the JL ICS subwoofer system one of the Audiophile Apartment’s Product of the Year awards for 2019. It wins on multiple levels: value, sound quality, and concept. It doesn’t get any better than that."

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Download the complete ICS-SYS Review (PDF)

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Fathom® IWS/ICS

Fathom® IWS-SYS-1088-inch (200 mm) In-Wall Powered Subwoofer System

Fathom® IWS-SYS-208Dual 8-inch (200 mm) In-Wall Powered Subwoofer System

Fathom® ICS-SYS-1088-inch (200 mm) In-Ceiling Powered Subwoofer System

Fathom® ICS-SYS-208Dual 8-inch (200 mm) In-Ceiling Powered Subwoofer System

Newsletter

Fathom® IWS-SYS-108
8-inch (200 mm) In-Wall Powered Subwoofer System

Fathom® IWS-SYS-208
Dual 8-inch (200 mm) In-Wall Powered Subwoofer System

Fathom® ICS-SYS-108
8-inch (200 mm) In-Ceiling Powered Subwoofer System

Fathom® ICS-SYS-208
Dual 8-inch (200 mm) In-Ceiling Powered Subwoofer System