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Is there a digital preamp that can adjust the individual levels of multiple inputs so that they play at about the same level? One of my audio systems has multiple sources (except for a turntable): USB for digital audio from PC and Mac (Amazon Music HD, iTunes AAC, Internet radio stations)...

Duok Audio VU3 (100W max per channel due to VU meter max position) Dual Analog VU Meter 2-Way Amplifier/Speaker Audio Switcher Box AC 250V 5A large current relay, micro-USB 5VDC power source, remote controller included I am curious as to any measurable degradation when quality relays are in...