Sennheiser IE 300 vs. IE 400 PRO

The $300 Sennheiser IE 300 (above left) is the company’s latest mid-price iem to be released in the Americas and Europe in March 2021 (out in Asia since mid January 2021). It is based sonically on the $350 Sennheiser IE 400 PRO, the best of their PRO series imo…which is evident from their superimposed frequency responses graphs. Both are single-dynamic-driver earphones.

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