· 3 Precision Tuned Balanced Armature Drivers
· Three Way Passive Cross Over Design
· One Balanced Armature Drivers for Low Frequency Production
· One Balanced Armature Driver for Medium Frequency Production
· One Balanced Armature Driver for High Frequency Production
· OxiCap Capacitors
· Vishay Resistor
· Hypoallergenic , Hard Acrylic Shells
· Noise Isolation -26dB
· Impedance 25　

The 3.Ai S requires the same painstaking hand craftsmanship that all Heir Audio CIEMs require. The 3.Ai offers all the advantages of an IEM, built with the same exacting standards of all Heir Audio products.

The 3.Ai S with it's single large bass driver delivers a warm "fun" sound signature with great entertaining low sub lows, and nice clean highs

what's in the box:

• Detachable Standard Cable
• Crush Proof Carrying Case
• Cleaning tool
• Quality Ear Tips
• Band