What's the difference in sound...

between the Dodson 218 and the 217 "D" w/218 software mod?
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I'm not much of a detail guy so I don't know how helpful this will be. I have owned both. The 217 D with 218 software is outstanding, all around -- balanced, smooth, detailed, non-fatiguing, invovling, etc.. The 218 is just MORE of this already "good" thing.