Hertz ECX-690.5 6" x 9" 300W 3-Way Energy Series Coaxial Speakers ECX-690.5 - Hertz 6" x 9" 300W 3-Way Energy Series Coaxial Speakers Sensitivity: 95dB SPL Tweeter Diaphragm: 1.58" Supertweeter Diaphragm: 0.6" Mounting Depth: 3.1"