Dominion® d108
The d108 is the most compact subwoofer of the Dominion® line-up, offering 500 watts of power to drive its single 8-inch active driver.
Videos
Various videos
-
Video 1
-
Video 2
-
Video 3
-
JL Audio Home Division Launch Part 1
-
JL Audio Home Division Launch Part 2
-
JL Audio Home Division Launch Part 3
|
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 utilise 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 also on-hand to accept either line-level or speaker-level signals.
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.
|
Power Modes
|
Automatic Signal-Sensing only
|
|
Level Modes
|
Variable from full mute to +15dB over reference gain
|
|
Low Pass Filter Modes
|
Off or 24 dB per octave with Linkwitz-Riley alignment
|
|
Low-Pass Cutoff Frequency Range
|
Variable from 25 Hz – 130 Hz
|
|
Phase
|
Variable from 0 – 280 degrees, referenced to 80 Hz
|
|
Polarity
|
0 or 180 degrees
|
|
Unbalanced Line Inputs
|
Stereo or Mono (two RCA Jacks)
|
|
High Level Inputs
|
Stereo or Mono (Removable plug)
|
|
Grounded/Isolated
|
Selectable Grounded or Isolated Line Inputs
|
|
Wireless Link Connector
|
Wireless Connector receptacle that can be used with a JL Audio JLink™ TRX system (sold separately) enabling wireless subwoofer connectivity.
|
|
Power Supply
|
Regulated PWM Switching Type
|
|
Amplifier Topology
|
Class D Switching Type
|
|
Model
|
d108
|
|
Enclosure Type
|
Sealed
|
|
Driver(s)
|
Single 8-inch (nominal diameter)
|
|
Frequency Response
|
(anechoic)
31 - 112 Hz (+1.5 dB)
-3 dB at 29 Hz / 119 Hz
-10 dB at 21 Hz / 143 Hz
|
|
Effective Piston Area
|
32.18 sq. in.
(0.0208 sq. m.)
|
|
Effective Displacement
|
80 cu. in.
(1.3 litres)
|
|
Amplifier Power
|
500 Watts RMS short-term
|
|
Dimensions (H × W × D)*
|
11.37 in. × 10.00 in. × 13.23 in.
289 mm × 254 mm × 336 mm
|
|
Net Weight
|
26.4 lbs.
(12.0 kg)
|
|
Cabinet Finish
|
Black Ash / High-Gloss Black
|
|
*The height dimension includes feet, depth dimension includes grill
|
Loudspeaker Technology
Dominion® subwoofers offer a vast performance envelope that unleashes all of the dynamics in your audio experience. It all starts with exceptional subwoofer drivers.
JL Audio’s engineering department is at the forefront of research into fundamental loudspeaker behavior. JL Audio have developed proprietary electromagnetic and suspension analysis systems and invested heavily in state-of-the-art manufacturing and testing. This has borne subwoofer drivers widely considered as reference standards for linear displacement and dynamic stability. It has also resulted in numerous U.S. and international Patents issued for technologies that refine and extend the performance envelope of the dynamic driver.
Designing and building superior drivers lies at the core of JL Audio’s passion for audio…and this gives JL Audio’s powered subwoofer systems a huge advantage.
DMA-Optimised Motor System
DMA is JL Audio’s proprietary Dynamic Motor Analysis system aimed at improving dynamic motor behaviour. As a result of DMA optimisation, JL Audio’s loudspeaker’s motor systems remain linear in force over an extreme range of excursion while maintaining a highly stable fixed magnetic field over a wide power range. This leads to vastly reduced distortion and accurate transient performance….or put simply: tight, clean, articulate bass. Detailed Information.
Since 1997, JL Audio has been at the forefront of Finite Element Analysis-based modelling of loudspeaker motors and suspensions. This research is aimed at decoding what JL Audio refer to as the "Loudspeaker Genome"... a project aimed at understanding the true behaviour of loudspeakers under power and in motion. A major component of this integrated system is DMA (Dynamic Motor Analysis). Starting with the 15W3v3 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 JL Audio’s 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 JL Audio a highly accurate model of a speaker's actual behaviour 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 analysed. These modelling routines are intense, requiring hours to run for a whole speaker.
DMA is able to analyse 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 modelling, 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 JL Audio’s engineers arrive at motor solutions that minimise this instability. Analysing this behaviour is critical to understanding the distortion mechanisms of a speaker motor and sheds light on the aspects of motor design that determine truly linear behaviour:
- 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
JL Audio’s ability to fully analyse these aspects of motor behaviour allows JL Audio’s 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. Summary Information
|
Vented Reinforcement Collar (U.S. Patent #5,734,734)
JL Audio's patented Vented Reinforcement Collar (VRC®) improves the rigidity and stability of the cone/spider/voice coil junction and directs airflow over the voice coil windings for improved thermal performance. Detailed Information.
The Vented Reinforcement Collar (VRC®) is a composite structure that addresses two issues related to reliability.
By reinforcing the critical junction between the cone, voice coil and spider, the VRC greatly reduces failures due to glue breakdown or material weakness. It does this by greatly increasing adhesive contact area and providing stress relief to the spider material at excursion extremes.
The VRCTM also features slots that facilitate air flow directly onto the voice coil windings. This reduces thermal compression effects and enhances reliability.
Current versions of the VRCTM also incorporate lead-wire strain relief structures to improve mechanical reliability. Summary Information
|
Floating-ConeTM Attach Method (U.S. Patent #6,501,844)
This assembly technique ensures proper surround geometry in the assembled speaker for better excursion control and dynamic voice coil alignment. Detailed Information.
JL Audio's patented FCAM TM 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. Summary Information
|
Engineered Lead-Wire System (U.S. Patent #7,356,157)
Carefully engineered lead-wire design and attachments ensure controlled, quiet lead-wire behaviour under the most extreme excursion demands. Detailed Information.
Managing the lead-wires on a long-excursion woofer is one of the trickier aspects of its mechanical design. To address this, many long-excursion woofers today rely on a simple solution that weaves the lead-wires into the spider (rear suspension) of the driver.
The biggest problem with this approach is that spider limiting behaviour plays a hugely important role a woofer's performance. Lead-wires that are attached or woven into the spider material can alter the spider's "stretching" behaviour. The tinsel wire naturally has less 'give' than the fabric material of the spider leading to asymmetrical spider behaviour and non-uniform stress distribution around the spider circumference. The wire attachment points can also cause localized pulling and tearing forces at the spider's excursion limits. As such, longevity becomes a major concern and makes the woven-in design less than ideal for very long-excursion designs.
While a traditional 'flying lead' design does not compromise spider linearity or radial stability, it creates its own challenges on a long-excursion woofer. Managing the 'whipping' behaviour of the wire and making sure it does not contact the cone or spider is one challenge. Another is ensuring that the leads do not short one another or the frame of the woofer.
To overcome these issues, JL Audio's engineered flying lead-wires work in conjunction with carefully engineered entry and exit support structures moulded into the terminals and the voice coil collar. Some models also feature jacketed lead-wires to further reduce the likelihood of shorting and fatigue. The result is flawless high-excursion lead-wire behaviour, with outstanding reliability and none of the compromises inherent to a woven-in lead wire system. Building woofers this way requires much more labour and parts complexity than the simpler woven-in approach, but the payoff is in reduced distortion, reduced mechanical noise and improved reliability. Summary Information
|
Precision Built in U.S.A.
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. All W7’s, W6’s, TW5’s, TW3's, W3v3’s and some of JL Audio’s ZR products. JL Audio also build their Marine Speaker Systems, Home Subwoofers, Stealthbox® products and the vast majority of their enclosed subwoofer systems in Florida
To pull this off in a competitive world market, JL Audio’s production engineering team has created one of the world’s most advanced loudspeaker assembly facilities. This commitment to state-of-the-art technology allows JL Audio’s highly skilled workforce to efficiently build JL Audio products to extremely high quality standards
While it is also feasible to build good quality products overseas (and JL Audio do build some of their products in Europe and Asia), it can be challenging when the product’s technology is innovative or complex. Since most of JL Audio’s premium loudspeakers incorporate proprietary, patented technologies requiring specific assembly techniques, JL Audio prefer that the people who design them have close access to the people manufacturing them.
Summary Information
|
|
In addition to the patented technologies listed above, multiple U.S. and international patents are currently pending.
|
|
Electronics
To fully realise the benefits of JL Audio’s long excursion drivers, a huge amount of controlled power is needed. These lofty power requirements create a difficult challenge when the realities of typical home electrical circuits are considered.
To tackle this, JL Audio’s electronics engineering team conducted a through analysis of demanding program material in order to balance current draw and actual output power requirements relative to the subwoofer system’s impedance characteristics. The result of this research led to advanced switching amplifier designs with massive toroidal transformers and very high output voltage capabilities, each precisely optimised for its driver.
The Gotham g213 amplifier, for example, delivers clean output voltage equivalent to 3,800 watts RMS (referenced to the nominal driver impedance), while operating comfortably within the typical household electrical circuit.
It may not be magic, but it certainly borders on it.
Manufacturing
|
Driver Manufacturing
|
Special, patented drivers like the massive W7’s, E-Sub dual spider and thin-line TW5’s used in JL Audio home subwoofers require proprietary assembly techniques and tightly monitored production disciplines that ensure consistency and quality. To meet these needs, JL Audio’s Miramar, Florida loudspeaker assembly facility has been specifically designed and equipped to build all of JL Audio’s cutting-edge loudspeakers. There is no other facility like it in the world…and no production team more dedicated to total quality.
|
|
Final Assembly
|
Dominion® powered subwoofers are assembled by a highly skilled team in JL Audio’s Miramar, Florida factory. Each assembly technician is responsible for the entire assembly process and follows documented procedures to ensure quality and consistency.
Ergonomic workstations with hydraulic lifts and multiple torque controlled tools allow for efficient and precise assembly of every product to the exact specifications established by JL Audio’s Engineering Department.
|
|
Testing
|
Quality is engineered into every one of JL Audio’s products. It must also be verified and documented with defined, repeatable test protocols.
To this end every Dominion, E-sub, Fathom and Gotham’s components are tested individually and as a connected system before assembly. At the end of final assembly, every subwoofer must pass a battery of electrical, functional and acoustic tests before it ships to JL Audio’s authorised dealers.
|
selection of videos is available in the videos album of the media gallery on this page, below.
|
|
Black Ash
|
|
|
High-Gloss Black
|
Home Cinema Choice
June, 2016
Adam Rayner
|
"So in addition to its pretty looks and capable controls, the Dominion d108 sub is astonishingly good in output. Played unseen, I might have thought it was subwoofer with a 12in driver and a solid amp."
|
SoundStage! Access
Apr 01, 2016
Hans Wetzel
|
"The Dominion d108 could be part of the ultimate 2.1-channel system for the common audiophile. Given the level of performance it was able to muster in my system, and the fact that it’s the smallest, least expensive subwoofer JL Audio makes, I worry for the competition."
|
Audio Video Revolution
Mar 30, 2016
Andre Marc
|
"If you are looking for the last missing piece for your system -- the sense of lifelike weight and scale -- and don't want to break the bank, I can’t possibly recommend the JL Audio Dominion subwoofer series highly enough."
|
UK Warranty Information – JL Audio’s Home Audio Powered Subwoofer Systems
JL Audio Home Audio Powered Subwoofer Systems are warrantied against defects in materials and workmanship for Three (3) Years from purchase date. Audio Visual Technology Solutions (UK) Limited will, at its discretion, repair or replace any products that exhibit defects in materials and/or workmanship during the warranty period.
Please hold on to your sales receipt! All warranty service requires original sales receipt documentation. The warranty only applies to the original purchaser from an authorised retailer.
Note: Products purchased from unauthorised dealers are not covered under warranty. Please see our list of authorised UK dealers.
Warranty Limitations
The following is not covered under Audio Visual Technology Solutions (UK) Limited’s warranty program:
- Product with defaced, altered or removed serial numbers (no valid, legible serial number = no warranty).
- Product owned by anyone other than the original purchaser from an authorised dealer. (The warranty is not transferable and will not apply to products purchased from unauthorised dealers.)
- Product that has been physically abused (run over by a car or beat with a hammer, for example).
- Product that has not been installed according to the instructions in the owner's manual.
- Product in which repair and/or modification has been attempted by unauthorised parties.
- Product damaged cosmetically due to improper handling or normal wear and tear.
- Product damaged in an accident, due to criminal activity (attempted theft, vandalism, etc.) or by 'acts of God' (flooding, lightning, etc.)
- Custom finishes or other cosmetic treatments applied to products. (Audio Visual Technology Solutions (UK) Limited will not be responsible for restoring or maintaining any custom finishes).
- Installation and shipping costs associated with removing, re-installing or shipping the product to Audio Visual Technology Solutions (UK) Limited for warranty service.
- Audio Visual Technology Solutions (UK) Limited is not responsible for any JL Audio home powered subwoofer products that have been purchased from overseas. Customers must contact there overseas dealer direct for any warranty claims or repairs.
If you need Service on your JL Audio Product:
All warranty returns should be sent to Audio Visual Technology Solutions (UK) Limited freight prepaid through an authorised UK dealer and must be accompanied by proof of purchase (a copy of the original sales receipt). Direct returns from consumers or non-authorised dealers will be refused unless specifically authorised by Audio Visual Technology Solutions (UK) Limited with a valid return authorisation number. Warranty expiration on products returned without proof of purchase will be determined from the manufacturing date code. Coverage may be invalidated as this date is previous to purchase date. Return only defective components. Non-defective items received will be returned freight-collect at the expense of the customer. Customer is responsible for shipping charges and insurance in sending the product to Audio Visual Technology Solutions (UK) Limited. Freight damage on returns is not covered under warranty. Always include proof of purchase (sales receipt).
Note: Products that require inspection and repair should be packed carefully, preferably in the original packaging material. Audio Visual Technology Solutions (UK) Limited may charge the customer under its discretion for supplying new packaging material if deemed that the packaging material supplied by the customer is not fit for shipping of the products after remedial work is complete.
|