The Hi-RES Series loudspeakers from Acoustic Research is an unprecedented combination of classic looks, innovative features, and revolutionary metal alloy components. From plasma-transferred diamond hardened titanium dome tweeters, and exclusive MagAlloy midranges, to Bob Carver/Sunfire high efficiency amplifiers in the powered tower and subwoofers. The result is solid sonic precision and unyielding tonal accuracy in any home theater or stereo configuration. This is the new standard for high-output, higher-fidelity performance.