Heat-resistant Design - The Asv voice coil and vented structure allow better airflow, preventing overheating during extended use.enhanced Bass Response - Engineered for maximum cone excursion, this woofer delivers deeper bass hits .87 Db Sensitivity - High sensitivity ensures louder output with less power.easy Installation - Standard 10 inch size and terminal compatibility make this woofer speaker quick to mount in most car enclosures. Woofer Technical Specification:Speaker Type: WooferWoofer Size: 10 InchRMS: 150WPeak Power: 300WVoice Coil Size: 52MM (2"""")Voice Coil Material: ASVVoice Coil Impedance: 4 OhmsVoice Coil Layers: 2Magnet Size: 40 OzFrequency range: 45-3.5KHZCone material: PolypropyleneSensitivity: 87dBWoofer The Small ParameterBl - 11.74Fs - 44.91Re - 4Sd - 3.63E-02Cms - 0.142Mms - 88.4153Qes - 0.7243Qms - 2.667Qts - 0.5696Vas - 26.1414Sensitivity - 87Package Information:2x Woofer