CHAPTER 3

The Project EVEREST DD66000 loudspeaker: a triumph in acoustics and technology

The following sections describe the primary features and components of the Project EVEREST DD66000 loudspeaker system.

The basic system configuration is what JBL has historically referred to as an augmented 2-way. In the 1950’s and 1960’s JBL built primarily 2-way systems with a 12” or 15” woofer crossed over to a large format compression driver/horn combination. Some of the systems would be “augmented” by a UHF device, most usually the 075 ring radiator that would operate above 8 kHz. These systems would have only a single crossover point in the middle of the audio range in an attempt to minimize any sonic degradation caused by the dividing network. The DD66000 has a single midrange crossover at 700 Hz blending one 1501Al woofer to the 476Be compression driver and horn combination. The 045Be -1 UHF driver is brought in at 20 kHz to cover an octave and a half of ultrasonic frequencies. A second 1501Al operates in the bass frequency range from below 30 Hz to around 150 Hz where it is rolled off at a gradual 6 dB/Octave. The first order slope ensures proper amplitude and phase summing between the two woofers over their total operating range. Both woofers operate below 150 Hz but only one of them extends up to the 700 Hz crossover point. This is done to achieve proper directivity control throughout the entire woofer operating range while delivering powerful and extended low frequency performance. Above 700 Hz, the HF compression driver and horn combination operates unassisted all the way to 20 kHz. (Fig.1)

Figure 1 – On-Axis response of the DD66000 system and that of each of the transducers through its crossover network. (2.83V @ 1m)

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JBL DD66000 manual Chapter
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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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