Zero hum here. Fantastic amp... and the Sophia Princess is a match made in heaven, unless you have brighter cans like the K701, then the Sophia Princess sounds too strident. This is the ONE product that I have bought on Head-fi that is 100% perfect for my needs and I haven't thought about upgrading for one instant. I wish I could say the same about headphones. I use mine for minimum 4 hrs a day, usually 8-12 hrs a day in my art studio.
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