Focal ICU 100 coaxial speakers (100 mm).

Focal ICU100 (INTEGRATION series) 2-Way Coaxial Speakers 4" (100 mm).

The ICU Universal 2-way coaxial speaker kit improves on your original-fit speaker installation. Its compact size, achieved by reducing the housing depth, and its snap-off fixings make this kit easy to fit. 
The new generation Universal comes with innovations and new features, including a new inverted aluminium/magnesium tweeter for even more detailed treble reproduction. 
A new chassis has also been designed for optimal integration and a more elegant design. All this is with just one objective: to offer easy-fit products that maintain excellent sound. 
On this coaxial model, the aluminium/magnesium tweeter has a 2-position +3 dB adjuster (Flat/High) for treble boost. 
This adjustment comes into its own when the speaker is placed low in the door. Shallow fitting: 49 mm.