Like the rest of the devices here, the Arcam rDAC takes a digital music signal from your computer's digital out (via a coaxial, optical, or, most commonly, a USB cable), and then converts it into a smoother-sounding analog signal, which is fed to your receiver through standard RCA cables. Testers noticed a rich, polished, bassy sound from the cast-aluminum rDAC. If you want to upgrade your sound for less than $500, buy this, or the similar Peachtree Audio DAC-it. [$480; amazon.com]
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