the iAudio 9 beats the best MP3 players by at least 2x in the audio quality and the slim look and light weight touch. however its weakness is the battery.
1. significant improvement of audio quality by addition of 30 pre-set equalizer settings, from rock to jazz, club to rap. while user can select the equalizer spectrum and create their own equalizers, COWON has pre-created 10 audio settings based on generic "psycho-acoustic" preferences.
2. light weight and even more handy. iAudio 9 is slim, about 40 gram (1.4 ounces), extremely light but very comfortable to carry and manage. definitely great for travel.
3. better functional keys and user interface. iAudio 9 applies the same COWON concept of functionality. user does not need to relearn new skills. it significantly improves on its manageability. the function keys are easier to see. user can select the degree of "sensitiveness" or "responsiveness" of the function keys. some reviewers stated that COWON's iAudio function key design "needs some learning to adjust to". this is subjective. i personally find the function key design easy to understand and did not need any "training" or reading of the owner's manual to use the device.
two major areas need improvement;
1. battery power. battery is really WEAK. playing WMA music file setting volume at 2/3 to max, COWON runs at most 8 hours even COWON advertises the device as 29 hours. i9 is really weak in battery compared with i7 which realistically runs about 40 hours non stop (COWON advertises i7 as 60 hours). this makes recharging a daily necessity for i9 whereas for i7, you can go for weeks without need for recharging. long distance international traveler may do better to go with i7 than i9 due to the battery issue.
2. USB cable and USB jack. to conform to the slim design, iAudio 9 uses a tiny USB input jack, smaller than your generic USB jack for external hard drive or digital camera. user has to carry the special USB cable when travel. COWON can provide an adapter so that the device can be plucked into a conventional USB cable.
Get more detail about Cowon iAUDIO 9 8 GB MP3 Player (Black).
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