Internal Crossover Network

The circuit topology, combined with the acoustic behavior of the 1501A L and 476Be provides a 24 dB-per-octave transition at 700 Hz. This is the primary crossover point of the system. Additionally, the 045Be -1 is turned on above 20 kHz to provide extended response to beyond 50 kHz. A second 1501A L woofer is used from below 30Hz to around 150 Hz at which point it is gently rolled off at 6 dB-per-octave. The design intent is to use both woofers in the bass frequencies and slowly transition to a single woofer in the midrange. This technique allows a primary crossover point between just two drivers and permits proper control of the directivity pattern of the system while providing tremendous power and air movement capabilities at the lower frequencies. As a result, the speed and power of the DD66000 system is unmatched from the lowest to the highest frequencies.

All of the electrical components are of the highest quality and lowest internal loss. The inductors used are air core so as to not introduce nonlinear hysteresis effects. Capacitors are constructed using polypropylene foil, which is known for having minimal distortion caused by dielectric absorption nonlinearities. The mid, high and ultra -high frequency networks employ battery bias to operate the capacitors effectively in a Class A mode. Every attempt is made to present as smooth a system impedance as possible to the driving amplifier. This design element is often overlooked in many loudspeaker systems. Amplifiers work their best when they are given a smooth, level load impedance in which to deliver current. (Fig.5)

Figure 5 – DD66000 system impedance

The aggregate of these attributes allows the DD66000 system to translate the electrical signal from source material into an accurate and unencumbered three-dimensional sound field. The system can do this at any desired listening level from whisper quiet to big -band loud while at the same time, maintaining unchanged acoustic characteristics.

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JBL manual Internal Crossover Network, DD66000 system impedance
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DD66000 specifications

The JBL DD66000 is a flagship model in the world of high-fidelity loudspeakers, designed to deliver an exceptional listening experience for audiophiles and music enthusiasts alike. With its rich heritage rooted in decades of acoustic engineering expertise, the DD66000 represents the pinnacle of JBL's commitment to superior audio performance.

One of the standout features of the DD66000 is its innovative three-way speaker configuration. This includes a 15-inch bass driver, a 4-inch midrange driver, and a high-frequency compression driver that produces crystal-clear treble. This arrangement allows for a wide frequency response, ensuring that every note, from the lowest lows to the highest highs, is reproduced with remarkable accuracy and detail.

The DD66000 boasts advanced technologies that enhance its performance. The Integrated Waveguide Technology ensures that sound is evenly distributed throughout the listening space, creating a spacious and immersive soundstage. This technology minimizes distortion and ensures that the sound maintains its clarity, even at high volumes. Additionally, the dual high-frequency compression drivers provide extended dynamic range, allowing the speaker to handle both quiet and loud passages seamlessly.

Another key characteristic of the JBL DD66000 is its robust build quality. The speaker is encased in an elegantly crafted cabinet that not only minimizes resonance but also adds to its aesthetic appeal. The sleek design incorporates high-quality materials, giving it a premium look that complements any audio setup.

The DD66000 is also versatile in its connectivity options. Designed to work seamlessly with various audio components, it features compatibility with both analog and digital sources. Audiophiles can enjoy their favorite music in high-resolution formats, ensuring that every detail is captured and enjoyed.

In summary, the JBL DD66000 is a masterful integration of advanced technology and superior craftsmanship. With its three-way configuration, cutting-edge sound dispersion technology, and solid build quality, it stands out as a premier choice for serious listeners. Whether used in a dedicated home theater or a high-end audio setup, the DD66000 promises to deliver an unrivaled listening experience, making it a worthy investment for those who demand the best in audio fidelity.
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