I can second that, the sigma is the only powercord where i was surrpised. Like really mind blowing, i put 2 sigma analogs on my mc2301's (which had alpha HC's before). Better and more prominent bass, wide soundstage. I had 2 friends visit that are audio freaks with way better ears than me, and i hadn't told them anything - first thing they asked was "wow what did you change, this sounds awesome"
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