Challenging a faulty premise isn't impolite. For those looking for comparisons of soundstage and 'voicing' between two inaudibly different devices, at a site that eschews subjective anecdotal non-repeatable claims, they may be disappointed in the responses.
If you came in and said, "I just did a full level matched dbx test between the d70 and the (dac of choice with comparable measurements), and I could pick them out 10/10 tries, what am I hearing?" You may find some more acceptance of your question.
When you come in and say some well reviewed dac is garbage, or that you should avoid some chip because it has a digital signature, or the soundstage is more forward, or whatever other audio buzzword bingo phrase you want to throw in, what do you expect?
For the most part, the senior members here are incredibly patient...trying to help people maybe realize for the very first time that a huge part of this industry is truly snake oil marketing, based on a flowery subjectivity that is completely removed from the actual science of it.
For those who choose to continue to chase the best sounding USB cable...well:
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