The Porta Pro features dynamic elements that deliver exceptionally
rich, deep bass and a remarkably wide frequency response from 15-25,000
Hz to capture every nuance in your favorite movie or musical
performance. Constructed from mylar, the elements are extremely rigid,
minimizing mechanical distortion and ensuring exceedingly accurate
sound reproduction. Neodymium iron boron rare earth magnet structures
enable the Porta Pro to deliver greater volume so you can hear every
note, even when competing against the sounds of a commuter train with a
low-voltage MP3 or disc player. Oxygen free copper voice coils improve
signal transmission and conduction for cleaner, clearer sound. Foam
earcushions provide an open, hear-through sound that lets you keep in
touch with your surroundings perfect to wear while running, at work, or
while traveling.