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Ears-on with AKG's customisable premium headphones
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AKG N40 - Frequency response database
AKG - Personalize the way you listen to your favorite music. #AKG #N40 deliver ultra-premium sound + 3 interchangeable filters, so you can completely customize your listening experience. Thank you, Stereo Electronics
AKG N40 | Headphone Reviews and Discussion - Head-Fi.org
AKG n40 in ear Monitor - Reviews | Headphone Reviews and Discussion - Head-Fi.org