Hertz Uno 6" x 9" Coaxial Speaker (x690)

1. Double 15 mm piezoelectric super-tweeter with PEI dome to extend the frequency response above 20 kHz.2. 40 mm PEI tweeter with ferrite motor, for a brilliant reproduction of mid-high frequencies and compactness.3. Tweeter and super-tweeter faceplate optimized for exceptional off-axis performance.4. High stiffness me