The Yamaha NS-4 HX is a pair of bookshelf speakers that were produced as part of Yamaha's NS series. These speakers are known for their distinctive design and sound characteristics. They are generally equipped with a 6.5-inch bass driver, which contributes to a solid low-frequency response, and a softer dome tweeter for crisp high-frequency detail. The NS-4 HX is designed to be used in home audio setups and can perform well with a variety of music genres. The cabinet is often made from MDF to minimize resonance, and the speakers typically feature a rear-firing bass port to enhance bass response. The crossover design in these speakers is focused on providing a smooth transition between the low and high frequencies. Impedance is usually around 8 ohms, making them compatible with a wide range of amplifiers. The power handling capability is generally rated around 80 to 100 watts, allowing for a decent level of output without distortion. Overall, the Yamaha NS-4 HX aims to deliver an engaging listening experience with balanced sound across frequencies.