Coaxial Speakers Impedance: 4 ΩFrequency response: 35 - 27,000Sensitivity: 87 dBLowest resonance frequency: 113 HzMaximum power: 210 WRMS power: 30 WWoofer material: IMPP Composite ConeTweeter material: PETVoice Coil type: CopperVoice Coil bobbin type: KAPTONMagnets: Y35