8" subwoofers in a box are among our most popular subwoofers in a box. They don't take up much space and can very well replace classic larger boxes if the right model is chosen. 8" subwoofers have fast and accurate bass, they don't hum and can beautifully supplement the missing bass component of the car's equipment. They're not bad at all in terms of performance, you just need to choose the appropriate amplifier and set it up correctly.