Cambridge Audio Azur 651A Integrated Amplifier Dynamic 75WPC Integrated Boasts Built-In USB Input: Azur 651A Allows You to Directly Connect Your Computer, Add Speakers, and Get Instantly Upgraded Sound Award-Winning Azur 651A Loaded With Sonic-Minded Design Features and Proprietary CAP5 Protection System Thanks to the explosion in digital music, personal computers have become as important as CDs. Aware of modern trends, Cambridge Audio developed a direct USB audio input on its Azur 651A amplifier instead of adopting the more common, simpler approach of including USB connectivity on a CD player. Now, you can simply plug your Mac or PC directly into the 651A amplifier and, with the addition of speakers, enjoy a whole world of digital music