AKG N5005 Reference Class 5-driver Configuration In-Ear Headphones | eBay
Original AKG Titanium Diaphragm Driver Units, 50mm in AKG 701 Sound Style (2pcs) – Earphone DIY Labs
AKG K92 Closed-Back Studio Headphones 3169H00030 B&H Photo Video
Archimago's Musings: REVIEW / MEASUREMENTS: AKG K371 (closed-back, over-ear, dynamic driver) - An affordable, modern, standard studio headphone. (And on using the miniDSP [H]EARS rig.)