Etymotic ER-4P to ER-4S Adapter

This adapter converts the low-impedance Etymotic ER-4P to have the same basic impedance rating as the ER-4S model. It restores a bit of the high frequency response normally provided by the ER-4S when it's used with a dedicated amp, and the cable allows for the best possible audio detail. Like the ER-4S themselves, the ER-4P with this adapter cable in place will definitely sound better with an amp.

The cable itself is 1-foot long, with a 'female' mini 1/8" (3.5mm) jack and a right-angled mini-plug design.

A great way to own two earphone options in the Etymotic ER-4 line of headphones!