receives the low and which woofer receives the midrange signals. One system should be set to “left” and be positioned as the left speaker system. The other system should be set to “right” and be positioned as the right speaker.

HF Drive / LF Drive

This allows to switch normal drive using a set of amplifiers and bi-amp drive using 2 sets of amplifiers. Move the shorting bar only in case of bi-amp driving.

Selection of the Bi -Amp position for the shorting bars bypasses the crossover function for the full range woofer and the high frequency driver. The low frequency woofer and the ultra -high frequency drivers are unchanged. Use of this feature requires the addition of an external dividing network to provide the 700 Hz primary crossover point for the system. The built-in attenuation and equalization for the 476Be remains in place. The high frequency level trim remains operational, as does battery bias for both the low and high frequency sections. Normally all 3 sets of bars (2-LF and 1-HF) would be moved together. It is possible to operate the system with just the low frequency system or the high frequency system set to Bi-Amp. Under this circumstance it would be necessary to use a combination of external dividing network along with the internal network. However, this would require some very special needs and is not generally recommended. Figure 12 shows the low frequency and high frequency voltage drive functions necessary to properly Bi -Amplify a DD66000 system using an external dividing network and two amplifiers channels. Neither the low pass nor high pass drive is a standard Butterworth alignment or, for that matter, any standard alignment. The provided drive curves were derived using the internal passive network and resulting acoustic low pass and high pass shapes. Duplicating these shapes will result in the same frequency response and directivity pattern as a passive DD66000. The low pass is made up of two cascaded second order sections and the high pass is a single high pass section. The values within a high quality analog dividing network can usually be modified to achieve these results. Recent digital crossover units will have no problem duplicating these curves.

Figure 12

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JBL DD66000 manual HF Drive / LF Drive
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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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