The Onkyo D-20 is a compact bookshelf speaker designed to deliver impressive sound performance in smaller spaces. These speakers feature a two-way driver configuration, which typically includes a woofer for bass response and a tweeter for high frequencies. With a sleek cabinet design, they blend well into various environments whether for home theater setups or music listening. The D-20 speakers are often praised for their warm sound signature, making them suitable for a wide range of musical genres. Additionally, the speaker might have a frequency response that typically ranges from 50 Hz to 40 kHz, providing a broad audio performance range. The impedance is generally around 6 ohms, making them compatible with many amplifiers. The sensitivity rating is usually around 85 dB, indicating how loud the speakers can get when fed a certain amount of power. With a compact design, these speakers can fit comfortably on shelves or stands without taking up too much space, making them a popular choice for both audiophiles and casual listeners alike.