Do you need to spend $900 for good earbuds? No. But spend a few minutes listening to the Fidue Sirius A91, and you might want to. I had to get the price out of the way. Not many people are willing to drop that amount of dough on full-size headphones, let alone earbuds – or more precisely, IEMs or in-ear monitors. But the Fidue Sirius is aimed strictly at the audiophile crowd – people who might be willing to spend hundreds or thousands of dollars on gear, the way others might shell out more cash for a luxury watch or…

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