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I use Sennheiser PC-350's coupled with an HT Omega Claro sound-card, and I notice a good amount of background hiss whenever I monitor my mic. When I turn mic boost off it eliminates the hiss, but I'm barely audible. A friend tells me the hiss could be because my sound card isn't grounded. Would buying a cheap portable amp (Fiio E6) help at all, or would I need something pricier?