The Onkyo D-66 is a compact bookshelf speaker designed to deliver a balanced and dynamic audio experience. It features a two-way speaker configuration with a 16 cm woofer and a 2.5 cm soft dome tweeter, providing a rich and clear sound profile. The speaker cabinet is constructed from MDF (Medium-Density Fiberboard), which helps to reduce resonance and enhance sound clarity. The design of the D-66 includes a front-firing bass port, allowing for improved low-frequency response and placement flexibility. It has a frequency response range that typically spans from around 40 Hz to 30 kHz, making it suitable for a variety of music genres. The impedance rating is usually around 6 ohms, allowing for compatibility with a wide range of amplifiers. The speakers may feature a sensitivity rating of approximately 86 dB, which ensures decent performance even with lower-powered amplifiers. Aesthetically, the Onkyo D-66 often comes in finishes that blend seamlessly with modern audio-video setups. Overall, it offers a solid balance of performance and aesthetic appeal, making it a suitable choice for music lovers seeking quality sound in a compact form factor.