The Etymotic ER-4 MicroPro series is the company's top-end in-ear headphone line.
While the Etymotic ER-4PTs have less low-end oomph than some competing earphones in this price class, they deliver excellent sound with very accurate tonal balance.
Etymotic pioneered in-ear headphone design in 1991 with the original ER-4. The new ER-4PT differs in the details and still sounds great.
Etymotic invented in-ear headphone technology way back in 1984; no wonder its headphones sound so good.
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