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You’ve heard of high-definition (HD) TVs that offer maximum picture clarity. Meet Polk’s I-Sonic entertainment center, which champions HD radio, a similar technology that produces ultra-crisp (think CD-quality) audio. Never mind its integrated DVD player, alarm clock capabilities, scrolling song info, and stereo sound. You’ll be floored by AM, FM, and XM satellite broadcasts that come through clear as day. $599 (XM requires additional $49 antenna). www.polkaudio.com