Audio systems, which include surround sound receivers and shelf stereos, are audio electronics designed for use in entertainment settings. High-end audio systems use multiple speakers, woofers, and other parts to produce a high-performance sound experience. By bringing high-end audio into the mainstream, automakers are responding to this robust demand. This trickle-down effect is confirmed by perceptions of automakers' brands. Even higher up than luxury brands Lexus and Cadillac in the global consumer's association rankings for premium audio are Honda and Toyota.