The Onkyo D-66 X is a bookshelf loudspeaker that features a 3-way, 3-speaker air suspension system. This model, which was manufactured between 1988 and 1989 in Japan, is a successor to the D-66 and is designed to cater to audiophiles with its advanced engineering and high-quality components. The speaker incorporates a pure cross-carbon woofer that contributes to its audio fidelity, while an acoustic stabilizer is used to reduce unwanted vibrations. The medium-range driver utilizes pure carbon, and the tweeter employs ultra-hard titanium for its diaphragm, enhancing sound clarity and precision. The design of the cabinet includes a round baffle that improves sound localization. It has a noticeable robust build with an external dimension of 325 mm width, 590 mm height, and 291 mm depth, and weighs approximately 20 kg. Its impressive frequency response ranges from 33 Hz to 45 kHz, ensuring a comprehensive playback experience across the audio spectrum.
