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Add a Comment You need to be a member of Co-production practitioners network to add comments! Hello, you need to enable JavaScript to use Co-production practitioners network. 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 behavior 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 inch woofer with a medium-sized roll has an effective piston area of Compare this to a fat-surround inch woofer which has a piston area of 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.

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.

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. Summary: Carefully engineered lead-wire design and attachments ensure controlled, quiet lead-wire behavior 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 behavior 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" behavior. The tinsel wire naturally has less 'give' than the fabric material of the spider leading to asymmetrical spider behavior 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' behavior 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 molded 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 behavior, with outstanding reliability and none of the compromises inherent to a woven-in lead wire system. Building woofers this way requires much more labor and parts complexity than the simpler woven-in approach, but the payoff is in reduced distortion, reduced mechanical noise and improved reliability.

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

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. We have an extremely impressive technological tour de force, that's what. The motor also has more stroke than any other subwoofer I've tested Xmag of The W7 reproduces rock and jazz with merciless precision, bass drums have the correct size and perfect impact, and these qualities are not diminished as volume is increased.

Hard techno beat attacks really bring the W7's special dynamic qualities to light, even fat, brutal synthesized bass blasts cannot exceed this woofer's reserve capabilities… A "Killerwoofer". Not only are its ingenious technical solutions impressive, but also its sonic abilities which leave no desire unfulfilled. Without exaggeration, one can call the W7 one of the best woofers of all times. Stay informed about new products and promotions.

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