Highlight Penta BA system Size & Weight Approx. 11.0g Magnesium diaphragm super tweeter General Features Closed, Penta Balanced Armature Sony's original design BA Driver Units Light and durable magnesium outer housing Pre-formed ear ...

Specifications Size & Weight Weight Approx. 11.0g General Features Headphone Type Closed, Penta Balanced Armature Driver Unit Penta Balanced Armature Impedance (Ohm) 20ohms(at 1kHz) Frequency Response 5Hz- 40000Hz Sensi...

Features Discover a new realm of musical expression On stage, the IER-M9 In-ear monitor headphones authentically reproduce raw emotion and musical nuance. Faithfully reproduce every performance With a Penta Balanced Armature system including magnesium diaphragm super tweeter, integrated magne...