JABEN - AKG N40 features a hybrid driver system that includes a Knowles balanced armature and dynamic driver. The carefully selected combination of both drivers allows you to enjoy High-Resolution audio content
AKG n40 in ear Monitor | Headphone Reviews and Discussion - Head-Fi.org
N40 | High-resolution in-ear headphones with customizable sound.
Unused AKG N40 Customizable High-Res WIRED Headphones in Bulk Pkg - BLACK SILVER 28292278235 | eBay