Etymotic ER-4P, ER-4S Review

When you’re ready for aural bliss, shell out the big bucks for the ER-4P or ER-4S. These ear-canal headphones have flanged ear tips that provide noise isolation. The ER-4S requires an amp; the ER-4P produces 10dB more output at high frequencies and 13 dB more at low frequencies, providing ample bass and high-end response for a player only. You can also buy the ER-4P headset for your player and then add an amp with the 4P-to-4S cable.