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I know a few members have had the Topping A30 and Dx7/Dx7s. Any thoughts on the sound and build quality of the amps or amp portion of the Dx7/Dx7s?

In an attempt to rise above the subjective and marketing-oriented reviews on the web, I would like to put together a list of good (and bad) mobile, headphone/desktop, and full-sized amplifiers; and related testing data in a spreadsheet that I will later post on ASR. The primary goal of this...