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I got a HD 25-1 that used to be a HMD-25. The original owner took off the mic and replaced the 4-conductive connector(TRS?). However, it's 600 ohm and I know my Xonar DX cannot power 600 ohm cans, so I was wondering what's the cheapest amp that can handle 600 ohms? I'm on a tight budget. If it's DIY, then that's the path I will go.