Etymotic ER4-PT

• Unsurpassed frequency response accuracy and sound isolation
• The only earphones equipped with Accu·Driver TM balanced-armature, custom- tuned drivers, channel matched ± 1 dB. Specified for a response accuracy of 86% or better
• Perfectly suited for the mobile audiophile, musician or monitoring/recording engineer. Designed for most home audiophile equipment, portable audio players, laptops, and net books with an 1⁄4” or 3.5 mm headphone input.

What’s new with the ER·4PT

• Enjoy the ER·4PTs in flight! All ER·4PTs are packaged with an airline adapter (P=portable, T=travel).
• The retail packaging of ER·4PT includes new messaging and graphics. Each package is tamper- evident and ships with a hang tag for proper retail peg placement.
• Each ER·4PT includes a Channel-Matching Compliance Graph, signed by an Etymotic test engineer, certifying the match of each driver to ±1dB.

• Transparent, reference-quality sound
• For audiophiles, performing musicians and recording engineers
• For mixing, monitoring and critical listening
• Accurate real-ear response
• Unsurpassed isolation from outside sound

• Response Accuracy: 86%
• Noise Isolation: 35-42 dB
• Frequency response: 50-10 kHz ± 2 dB; 20-16 kHz ±4 dB
• Acoustic polarity: + electrical = + acoustic
• Transducer type: balanced armature
• 1 kHz sensitivity: 108 dB SPL for a 0.2 V input (102 dB @ 0.1 V; 106 dB @ 1mW)
• Impedance: 27 Ohms nominal
• Maximum output: 122 dB SPL
• Maximum continuous input: .75 Vrms
• Weight: less than 1 oz