Choosing an Enclosure

GTi Series subwoofers are optimized to perform best in small sealed, vented and bandpass enclosures. While infinite-baffle mounting of GTi Series subs is possible, power handling will be compromised since there will be no enclosed volume of air to help the speaker’s suspension control the motion of the woofer’s cone. For this reason, we do not recommend infinite- baffle mounting for high-power applications.

You should choose the enclosure you’ll use based on the type of music you listen to, how much amplifier power you’ll use to drive the subwoofer, and how much space inside the vehicle you can devote to a subwoofer enclosure. If you’ll be using your GTi Series subwoofer for SPL competition, please see the document titled “GTi as SPL Competition Subwoofers” (included with your woofer).

Because a sealed enclosure provides the most control over the woofer’s movement, a woofer mounted in a sealed enclosure will handle more power at low frequencies than a woofer mounted in another enclosure type. Sealed enclosures provide more accurate sonic reproduction than other enclosure types, so they are well suited

to all types of music. Sealed-enclosure construction is straightforward. An optimum sealed enclosure is always smaller than other types of enclosures that are optimized for a particular speaker, so they require the least space inside the vehicle.

Vented enclosures provide better efficiency in the 40Hz – 60Hz range, but this efficiency comes at the expense of sound output in the lowest octave (below 40Hz) and at the expense of some control and power handling below box tuning. If you are using a small amplifier, a vented box will provide more bass output from less power. Vented enclosures are also well suited to a variety of music types. Because vented enclosures require the volume

of the enclosure and the size of the port to have a specific relationship with the characteristics of the woofer, the enclosure must be built exactly to the specifications provided. If you wish to use a vented enclosure, we strongly recommend having your authorized JBL dealer build it; or verify that your design is correct if you wish to build it yourself. An optimum vented enclosure is always larger than the optimum sealed box for the same woofer, and will require more space inside the vehicle.

PRO POWERTM

Bandpass enclosures can provide the greatest output available from any amplifier and subwoofer combination – at the expense of sonic accuracy. If sheer SPL (sound pressure level) is what you desire most, choose a vented or bandpass enclosure. Bandpass enclosure design is very tricky and the aid of a computer and enclosure design software is necessary if you wish to design the enclosure yourself. Like a vented enclosure, a bandpass enclosure must be built exactly to the specifications provided. Bandpass enclosures can be quite large and may require a lot of space inside your vehicle.

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JBL W15GTi, W10GTi, W12GTi owner manual PRO Powertm, Choosing an Enclosure
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W12GTi, W10GTi, W15GTi specifications

JBL has long been a name synonymous with high-quality audio equipment, and their GTi series of subwoofers—specifically the W15GTi, W10GTi, and W12GTi—are standout examples of their commitment to performance and innovation. Each model in this lineup is designed to deliver deep, accurate bass, making them ideal for serious audiophiles and car audio enthusiasts.

The JBL W15GTi is the largest subwoofer in the series, featuring a massive 15-inch cone. This model is engineered to handle substantial power, boasting RMS ratings up to 2,500 watts, with peak power capabilities reaching 10,000 watts. The W15GTi utilizes a fiberglass reinforced cone for enhanced rigidity and reduced distortion, combined with a large, vented pole piece that allows for better heat dissipation. This innovative design not only increases the subwoofer's longevity but also ensures that it performs optimally even during extended use.

Moving to the W12GTi, the 12-inch variant, we see a balance of size and power. It supports an RMS power handling of 1,500 watts and can peak at up to 6,000 watts. The W12GTi incorporates an advanced suspension system that includes a progressive-roll surround for improved excursion and a cast-aluminum basket that reduces unwanted resonance. This model is ideal for those who want impactful bass without excessive weight, making it easier to install in a variety of vehicles.

Finally, the W10GTi rounds out the series with its compact 10-inch size. Despite being the smallest of the trio, the W10GTi does not compromise on performance. It has an RMS rating of 1,200 watts and peak power handling up to 4,800 watts. Its lightweight design, paired with JBL’s signature low-frequency extension technology, produces a rich and dynamic bass response that enhances any audio experience. The W10GTi is particularly suited for smaller cars or for those looking to maximize space without sacrificing sound quality.

All three models feature advanced technologies such as JBL's patented Vented Spider, which provides linear movement and allows for greater excursion, and a dual voice coil configuration that enhances their versatility in different setups. Constructed with high-quality materials and precise engineering, the W15GTi, W12GTi, and W10GTi subwoofers offer unmatched audio fidelity, deep bass, and reliability, making them a popular choice for those seeking high-performance audio solutions. Whether you’re aiming for a thumping low-end experience or precise sound reproduction, JBL’s GTi series has a model tailored for your needs.
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