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The HD 6xx (ie HD 650) are a slightly darker, warmer version of the HD 600s. Some say the 650s are a bit veiled when compared to the 600s. If that's true then I prefer a less harsh, less shouty "veiled" sound of the 650s. These are a no brainer. Paired with a DAC and the O2 amp and you are set. Unbeatable price.