Hertz Audio ECX 130.5 (ECX130.5) 5-1/4" 2-Way Energy Series Coaxial Speakers Hertz Audio ECX 130.5 (ECX130.5) 5-1/4" 2-Way Energy Series Coaxial Speakers Power Handling: 150W Peak / 50W RMS Impedance: 4-ohm Frequency Range: 70 - 23 kHz Sensitivity: 93 db SPL