Please note that as we are currently relocating our warehouse and showroom, all orders for in stock items will be shipped on Monday 16th December 2024. For a detailed overview of our trading hours, please refer to our Store Location page.

JL Audio Gotham g213v2 Dual 13.5" Powered Subwoofer - Gloss Black

Brand: JL Audio
Product Code: JLA-G213V2-GBL
Warranty: 3 Years
$39,995.00
Qty:  
JL Audio
Truck
Free Shipping On Orders Over $99
Padlock
256-Bit SSL Secure Ordering System
Shield
Australian Warranty On All Products
Please enter your post code to obtain a shipping estimate for this product.
Post Code:
Store Categories

Powered Dual 13.5-Inch Subwoofer, 4,500 Watts

Your first look will tell you that you are looking at something special... your first listen will confirm it beyond a shadow of a doubt.

The beauty of the Gotham® v2 extends well beyond its exotic design and exceptional craftsmanship, aiming right at the emotional core of musical and cinematic enjoyment. This is a subwoofer system with limits that exceed the needs of the typical home theatre application, delivering a weight and integrity of reproduction that can only come from a system that is always in control. Its allure lies as much in its ability to convey subtleties as in its prodigious output capabilities. It is simply devastating.

A luxurious, handcrafted gloss-black finish is complemented by machined aluminium and stainless steel accents for a look and feel that fits perfectly with the finest home furnishings. More importantly, the beautiful cabinet houses a pair of JL Audio's highest-technology Subwoofers. When demanded by program material, the Gotham's prodigious switching amplifier can deliver 4500 watts of RMS power, to take full advantage of the twin drivers' four inches of peak-to-peak excursion capability. This ensures that the Gotham can breeze through material that makes other subwoofers go into clipping, limiting or distress.

A very complete set of signal processing features is easily accessible on the top surface of the Gotham. These include a highly flexible low-pass filter, variable phase, switchable polarity, e.l.f. trim and our powerful Digital Automatic Room Optimization (D.A.R.O.) system. A calibrated microphone is included for the D.A.R.O. system. Input connections are made via unbalanced RCA connections or balanced Neutrik® combo XLR/TRS jacks. Also included is an XLR output to connect a second Gotham® v2 as a slave unit.

Listening to a Gotham® v2 reveals an entirely new dimension of subwoofer performance... a dimension so satisfying that listening to lesser subwoofers will forever become an act of compromise.

Finish: Gloss black, hand-finished to the highest furniture-grade standard.

Grille Finish: Black fabric (separate grilles for drivers and controls).

Enclosure Construction: Fibreglass, 2-inch (52 mm) wall thickness.


Technology

JL Audio Gotham g213v2

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 optimise 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 equaliser 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:

  1. Connect the included calibration microphone to the front panel of the subwoofer.
  2. Press the calibrate button on the front panel of the subwoofer.
  3. Hold the microphone at the primary listening position for about a minute.
  4. 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.

JL Audio Gotham g213v2

Dynamic Motor Analysis - DMA Optimized Motor

Summary:

JL Audio's proprietary Dynamic Motor Analysis system is a powerful suite of FEA-based modelling 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 modelling 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 behaviour 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 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 our 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

Our ability to fully analyse these aspects of motor behaviour 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.

JL Audio Gotham g213v2

W-Cone

Summary:

The W-Cone is a unit-body cone assembly that delivers astonishing cone stiffness with minimal mass. The shape also provides superb torsional rigidity, which is critical to maintaining voice coil alignment at the suspension limits.

Detailed Information:

The more excursion and motor force a speaker has, the more important cone rigidity becomes. The acceleration forces are extreme, requiring the cone to withstand rapid changes in speed and direction without deformation. Deformation not only leads to distortion, but can also affect the speaker's mechanical integrity by allowing the voice coil to go out of alignment and rub on the top-plate and the pole-piece of the motor.

There are several approaches to enhancing cone rigidity. The obvious ones are using a thicker material and/or a stiffer material. In recent years, several manufacturers have used composite cone materials (Kevlar®, fibreglass, etc.) or metals (aluminium, magnesium, titanium alloys). The use of these exotic materials is typically accompanied by marketing claims that the material chosen has exceptional stiffness-to-mass characteristics. These are true statements, but can be misleading. While these materials have excellent stiffness-to-mass properties (compared to paper or poly), they are not lighter than paper or poly in practice. This means that their use accepts the compromise of added moving mass on the design. This leads to efficiency penalties and suspension complications (it's harder to keep a heavy mass aligned properly).

A simple poly cone diaphragm, while sufficient for lower power designs, would not remain rigid under the demands that the W7 design requires. Our engineering team knew that high levels of cone rigidity would be needed, but they focused on achieving rigidity without a huge weight penalty. This ultimately led to the design we call the W-Cone. The W-Cone assembly achieves its rigidity through architectural means, rather than through inherently stiff materials. The design addresses the stiffness issue by using two lightweight mineral-filled polypropylene skins, bonded together at the perimeter and the centre of the assembly. The lower skin's cross-section is shaped like a 'W', hence the name, and provides incredible rigidity when bonded to the dished upper skin. The effect is not unlike the trusses of a bridge or the unit-body construction of a modern automobile. In addition to the overall rigidity benefit, the lower skin's shape distributes the force generated by the coil and motor more evenly than a typical diaphragm. The force is not only applied to the apex but also distributed to the perimeter of the outer diaphragm for more linear behaviour. A further benefit of the W-Cone is that the upper skin (the one in contact with the listening environment), is isolated from the high air-pressure gradients of the enclosure, further reducing deformation (and distortion).

As a point of comparison, the W-Cone assembly of a 12W7 is 32% lighter than a typical aluminium-alloy 12-inch cone. If analysed in terms of weight per square inch of piston area, the W7 cone-body weighs 1.24g/sq.in., compared to 1.45g/sq.in. for an aluminium-alloy cone and 1.66g/sq.in. for a titanium-alloy cone.

So why polypropylene? As stated above, our patented W-Cone technology achieves all of the benefits of more exotic materials while better suiting the unique nature of the W7. Since the W7 surround is detachable, the moving system (including the diaphragm) is subject to mechanical stress unseen in conventional designs. Because the user can tug on the cone while manipulating the surround, the cone must be able to handle this without buckling or deforming. Paper, metal or brittle composite cones would not handle this well. Our two-skin unit-body cone design achieves outstanding axial and torsional stiffness to withstand all kinds of abuse, and will remain largely unaffected and unblemished.

JL Audio Gotham g213v2

Elevated Frame Cooling

Summary:

JL Audio's Elevated Frame Cooling design delivers cool air through slots directly above the top-plate to the voice coil of the speaker. This not only enhances power handling, but also sound quality by minimising dynamic parameter shifts and power compression.

Detailed Information:

Many speakers employ venting techniques to enhance voice coil cooling. This is typically accomplished by having big holes in the sides of the frame just below the spider attachment shelf. While it provides a modest cooling benefit, this low-velocity air-flow does not blow directly or strongly on the voice coil.

Our design improves upon this cooling technique in a number of ways. By elevating the frame above the top-plate of the motor (via stand-offs integrated into the bottom of the frame) a narrow, high-velocity air-path is created between the bottom surface of the frame and the top surface of the top-plate. This air path leads directly to the voice coil and then turns upward into the spider air cavity. By utilising the pumping action of the spider through this focused air path, a large volume of cool air hits the coil windings directly.

Another important benefit is that the upper surface of the top-plate (one of the speaker's hottest parts) is directly exposed to cooling air flow, whereas on a conventional design it is isolated from the air flow by the lower flange of the frame. The elevated frame technology greatly increases thermal power handling, reduces compression effects and does so without any additional parts.

JL Audio Gotham g213v2

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.

JL Audio Gotham g213v2

OverRoll™ Surround

Summary:

By utilising space wasted in conventional speakers, this ground-breaking innovation controls the W7's massive excursion without sacrificing precious cone area.

Detailed Information:

One of the first things you notice about a W7 is that something is "missing"... the mounting flange. Of course, this is actually not the case. The mounting flange is simply hidden beneath the surround and is made accessible for mounting purposes by detaching the outer edge of the surround and moving the roll to the inside (a pretty neat little trick). Apart from the obvious benefits of amazing your friends as you pull the surround off your speaker, there is a serious technical issue that led us in this design direction: Effective Piston Area ("Sd"). This is essentially the speaker's "cylinder bore", to use an automotive engine analogy, and is calculated by measuring the diameter of the diaphragm including one-half of the surround roll-width. In other words, from the top-centre of the surround on one side to top-centre of the surround on the other side.

The displacement capability of a speaker is determined by this piston area times the speaker's excursion capability. Displacement of air is directly linked to output potential. Therefore, the more air a speaker can ultimately displace, the louder it can play. That being said, there is a big difference between piston area and excursion: piston area doesn't need power to make it happen. This means that by making a larger piston, you are directly improving displacement for a given amount of excursion and, therefore, making your speaker more efficient. This is not the only factor that governs efficiency, but it is a major one.

To make a speaker have more excursion capability not only requires a motor design that can deliver more stroke, but also requires a surround rugged enough to handle the demands of longer excursions and controlled enough to keep everything lined up properly. If the surround's roll-width is not adequately large, its behaviour (compliance) is not linear over the useful stroke of the woofer and it is more likely to fatigue and fail. For this reason, speakers with longer excursion capability generally need larger surround rolls (we won't comment on the ones that use large rolls strictly for cosmetic effect).

The problem with big surrounds is that they begin to encroach on the effective piston area of the driver. For example, a typical 12-inch woofer with a medium-sized roll has an effective piston area of 81.52 square inches. Compare this to a fat-surround 12-inch woofer which has a piston area of 69.07 square inches (15.2 % less effective piston area than the medium-size roll.) To overcome this loss, the fat-surround woofer has to produce more excursion to displace the same air as the woofer with the medium surround (and will require more power to do so).

OverRoll™ technology neatly sidesteps this compromise by allowing us to make full use of the entire footprint of the speaker, placing the surround further to the outside than in a conventional woofer. This means that we can use a large roll for all its benefits without sacrificing cone area (in fact, the 12W7 has 1% more piston area than the medium-surround conventional woofer). By maximising the effective piston/total footprint ratio, we can deliver more output for a given excursion and outside frame diameter. This means that the prodigious excursion advantage of the W7 can be put to full use enhancing output, rather than making up for lost piston area.

The technology also provides a geometry advantage on the outside edge of the surround roll, allowing for more linear operation. A further benefit is that the mounting holes are inherently sealed by the surround, resulting in an improved box seal.

JL Audio Gotham g213v2

Radially Cross-Drilled Pole-Piece

Summary:

This innovative venting system greatly enhances thermal dissipation and power handling by directing air flow onto the voice coil former, working in conjunction with the Elevated Frame cooling technology to effectively remove heat from the voice coil. This improves power handling and reduces power compression effects, leading to more linear performance.

Detailed Information:

This technology differs from a conventionally vented pole-piece in that the air flow is capped off at the top of the pole-piece and directed through machined holes on the outer wall of the pole-piece to the region directly behind the voice coil. The top portion of the pole-piece is smaller in outside diameter where the holes vent and helps create a high-volume, high-velocity airflow path between the inner-coil cavity and the ambient air of the enclosure. This helps remove super-heated air that is trapped between the coil former and pole-piece on a conventional design, leading to a dramatic improvement in cooling efficiency, especially at high excursions.

JL Audio Gotham g213v2

Engineered Lead-Wire System (U.S. Patent #7,356,157)

Summary:

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 localised 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 lobar and parts complexity than the simpler woven-in approach, but the payoff is in reduced distortion, reduced mechanical noise and improved reliability.

JL Audio Gotham g213v2

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 behaviour 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 utilises 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.

JL Audio Gotham g213v2

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®
General Specifications
Enclosure Type Sealed, with Non-Parallel Walls
Enclosure Finish Black Gloss
Frequency Response (Anechoic) 19 - 112 Hz (±1.5 dB), –3 dB at 17.5 Hz / 120 Hz, –10 at 14 Hz / 150 Hz
Effective Piston Area (Sd) 0.1386 sq m / 214.70 sq in
Effective Displacement 12.7 L / 773 cu in
Amplifier Power 4,500 W RMS Short-Term
Power Mode(s) Off, On or Automatic (Signal-Sensing)
Light Modes Off, On or Dim
Signal Processing
Unbalanced Inputs Stereo or Mono (Two RCA Jacks)
Balanced Inputs Stereo or Mono (Two Female XLR Jacks)
Speaker/High-Level Inputs N/A
Input Grounding Isolated or Grounded
Input Modes Master or Slave
Level Control Reference (Fixed Gain) or Variable, From Full Mute to +15 dB Over Reference Gain
Filter Mode(s) Low-Pass
Filter Slope(s) 12/24 dB/Octave
Filter Frequency Range 30 Hz - 130 Hz
Filter Defeat Function Yes
Polarity 0 or 180 Degrees
Phase Variable, 0 - 270 Degrees
Extreme Low Frequency (E.L.F.) Trim Variable, -12 dB to +3 dB at 20 Hz
Line Outputs N/A
Output to Slave Balanced (One Male XLR Jack)
Calibration Mode Digital Automatic Room Optimization (D.A.R.O.), Incudes Laboratory-Grade Microphone
Physical Specifications
Width (W) 246 mm / 21.50 in
Height (H) 867 mm / 34.13 in
Depth (D) 610 mm / 24.0 in
Net Weight 163 kg / 360 lb

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

JL Audio Gotham g213v2
There are currently no reviews available for this product. Be the first to write a review!

Write a Review

Note: If reviewing a product that has variations such as colour or length, please include this information at the start of the review. For example "Colour: Red" or "Cable Length: 2m" etc.

Your Name:


Your Review: Note: Plain text only (HTML is not translated).

Rating: Bad           Good


Newsletter
Subscribe to our newsletter for exclusive offers, event information, news and more.

Email: *

First Name: (Optional)

Last Name: (Optional)