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.

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.

MkII automotive, MkII W10GTi, MkII W15GTi, MkII W12GTi specifications

JBL, a leader in audio technology, has long been synonymous with high-performance sound systems. Among its stellar offerings are the MkII series subwoofers, including the W12GTi, W15GTi, and W10GTi. These subwoofers represent a fusion of superior engineering, innovative technology, and durable construction, making them ideal for automotive enthusiasts seeking to enhance their sound experience on the road.

The JBL MkII W12GTi boasts a 12-inch cone driver, designed for deep and powerful bass response. It's constructed with a patented dual voice coil to provide effective power handling while minimizing distortion. This subwoofer features JBL’s signature GTi technology, which includes a high-temperature voice coil to ensure longevity and performance under heavy usage. Its sleek design includes a rigid aluminum frame that helps reduce unwanted vibrations, enhancing sound clarity and precision.

Meanwhile, the MkII W15GTi, with its larger 15-inch driver, takes bass amplification to another level. The W15GTi is engineered for even deeper low-frequency output, making it perfect for genres that rely heavily on bass. It incorporates advanced cooling technology to dissipate heat effectively, allowing for extended playtime without compromising performance. Additionally, its robust construction ensures resilience to the demanding conditions of automotive use.

For those who prefer a more compact solution without compromising sound quality, the MkII W10GTi serves as an excellent choice. Featuring a 10-inch driver, this subwoofer is versatile and delivers impressive bass response even in smaller systems. The W10GTi utilizes a unique cone design to enhance sound dispersion, ensuring that every note is heard clearly. Its tight construction optimizes the management of air within the enclosure, further improving acoustic performance.

All three models in the MkII line share essential technologies, such as JBL’s patented Slipstream ports, which reduce port noise and enhance airflow, leading to cleaner bass output. Additionally, they feature adjustable frequency response, allowing users to customize their listening experience according to personal preferences and vehicle acoustics.

In summary, the JBL MkII W12GTi, W15GTi, and W10GTi subwoofers are exceptional products for automotive sound systems. Their advanced technologies, impressive power handling capabilities, and robust designs make them ideal choices for audiophiles and casual listeners alike, setting a new standard in mobile audio performance. Whether you’re looking for deep rumbling bass or a balanced audio output, JBL’s MkII series delivers unparalleled value and performance for the modern car audio enthusiast.