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Product details:
ER4PT earphones are designed for sound engineers and audiophiles in constant motion. ER4PT earphones can be used with portable devices without an additional amplifier. The ER4PT has 10 dB greater output at high frequencies and 13 dB greater output at low frequencies. The higher sensitivity and enhanced bass of the ER4PT have made it the most popular earphone in the series. Included with every pair of ER4PT earphones is an industry-exclusive channel-matching compliance graph, signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers.
