Noise isolation far surpassing that of active noise canceling earphonesFrequency response: 20Hz-16kHz, ± 4dBFor mixing, monitoring and critical listeningTransducer type: balanced armatureImpedance (ER-4P): 27 Ohms nominal1kHz sensitivity (ER-4B/ER-4S):108 dB SPL for a 1.0 volt inputMaximum output: 122 dB SPLNo batteries required -- can be plugged into any audio source5' cord with 3.5mm stereo phone plugMaximum continuous input (ER-4B/ER-4S): 3.0 VrmsMaximum continuous input (ER-4P): .75 VrmsIncludes carrying case, 1/4" stereo adapter plug, six 3-flange eartips, 10 foam eartips, filter changing tool, 4 replacement filters and shirt clip
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