Etymotic Research er-4b Guida Utente

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Earphone Descriptions
ER-6 Isolator earphones have a flat real-ear response for 
reproducing CD and MP3 recordings. The sound accuracy is 
comparable to professional earphones.
6i Isolator earphones have 8 dB greater overall sensitivity 
and 8 dB more bass than the ER-6 earphones.The higher sound
output and enhanced bass of the 6i make these earphones ideal
for MP3, CD, DVD and other portable players, and eliminates the
need for a headphone amplifier.
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