Subwoofer Information

The subwoofer utility computes the number of subwoofers required to attain a comparable subwoofer sound level within the space in a distributed in-ceiling subwoofer system.

COVERAGE – The number of subwoofers selected by CSC does NOT indicate how even the coverage will be throughout the listening space, which is also an important consideration. Additional subwoofers may be necessary to achieve acceptable coverage. Ceiling-mounted subwoofers typically directly cover an area of 120 x 120 degrees. At ratios that utilize fewer subwoofers, coverage becomes an increasingly important factor to consider. In addition, while placement near walls and corners increases sensitivity, it can result in sound that is too loud close to the subwoofers and too soft away from subwoofers. As rooms get larger, it is increasingly important to cover the center of the room directly.

CROSSOVER MODE and EQ -- This chart assumes the use of a traditional active crossover that low-passes the subwoofers and high-passes the main speakers. If main speakers are being operated full-range (not high-passed), then a subwoofer/mains bump will occur in the frequency response, resulting in an overly dominant mid-bass (ie, "muddy" bass). A PARAMETRIC EQ (set with measurement software) must be utilized in the signal chain before the crossover to remove this bump. Graphic EQs typically do not have the capability of being set to the exact center frequency, nor can their bandwidth be adjusted to cover just the bandwidth that needs to be reduced without overly affecting the sound.

POWERING THE SUBWOOFERS -- Ratios for Control 312CS are based on it being operated low- impedance (8 ohms). Ratios for Control 19CS are based on it being operated either low- impedance (19CS) or at the top 60 Watt tap (19CST). It is further assumed that the subwoofers are driver with adequate power amplification to attain maximum SPL capability (for low- impedance, the power amp should be rated double the speaker continuous average pink noise power rating; for 70V/100V the power amp should be rated 20% higher than the sum of the taps). With less amplification per subwoofer, the number of subwoofers may need to be adjusted to a greater quantity (at an approximate ratio of doubling the quantity of subwoofers for each halving of the amplifier power).

USING DIFFERENT JBL PRO SUBWOOFER MODELS -- JBL Professional provides a wide variety of subwoofer choices. For systems where the chart indicates a large number of Control 312CS subwoofers, an alternative JBL subwoofer may be warranted. Choices include Control SB210, AL6115, ASB6118 or ASB6128. Be especially mindful of coverage when using fewer subwoofers (see "Coverage", above).

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JBL Professional Speaker manual Subwoofer Information
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Speaker specifications

JBL Professional speakers represent the pinnacle of audio innovation and engineering, catering to a range of professional audio applications. Renowned for their superior sound quality and robust design, JBL speakers are widely used in concert venues, recording studios, and broadcasting.

One of the key features of JBL Professional speakers is their ability to deliver exceptional clarity and power across a broad frequency range. This is achieved through advanced transducer technology, where high-quality drivers are engineered to produce detailed highs, natural mids, and impactful lows. JBL's patented Waveguide technology further enhances sound dispersion, ensuring that audio reaches every corner of the venue without losing fidelity.

Durability is another hallmark of JBL Professional speakers. Many models are constructed using tough materials and are designed to withstand the rigors of touring and live performances. Reinforced enclosures help to reduce unwanted vibrations, providing a stable platform for sound projection. This rugged build, combined with weather-resistant elements in select models, makes them ideal for both indoor and outdoor applications.

Integration with modern technologies is crucial for professional audio equipment, and JBL Professional speakers are no exception. Many models feature advanced digital signal processing (DSP) capabilities, offering precise control over sound tuning and equalization. With built-in Bluetooth connectivity, users can stream audio wirelessly from their devices, simplifying setup and enhancing flexibility during performances.

Another notable characteristic of JBL Professional speakers is their versatility. They come in various configurations, including portable, powered, and passive models, which cater to different setups and environments. From compact speakers for small venues to high-output systems for large concerts, JBL offers a solution for every professional audio need.

Acoustic optimization is also at the forefront of JBL's design philosophy. Many speakers incorporate features like automatic EQ settings and feedback suppression, allowing for seamless integration into diverse sound systems. This ensures that audio professionals can achieve optimal sound in real time, regardless of the environment.

Ultimately, JBL Professional speakers stand out in the marketplace due to their unparalleled sound quality, robust construction, and cutting-edge technology. Whether it's a live performance, recording session, or event production, JBL continues to be a trusted name in professional audio, delivering exceptional performance and reliability.
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