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Tech & Innovation·September 6, 2026·1 min read

I upgraded my Sennheiser HD 660S2 wired headphones with a more powerful iFi DAC to unlock the highest quality audio — but I honestly wasn’t expecting these results

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The review underscores a broader pattern in consumer hardware — incremental spec upgrades don’t always translate into perceptible gains. For operators, that’s a reminder to validate “better” components against actual user experience before baking them into product roadmaps or BOMs.