Exactly what I needed! Today I replaced my cheap Tripp Lite surge protector with a Furman PST-8D and the faint background hiss I was hearing from my PC -> USB DAC -> Phone amp at high volume is now completely gone. BTW, my PC's power supply, LCD, and printer are plugged into Furman "digital ultrasonic noise filter" outlets, while the DAC and headphone amp are plugged into "line-filtered" outlets. Never heard such a black background on this amp.
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