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 with minimal distortion.87.4 Db Sensitivity - High sensitivity ensures louder output with less power. Get more volume and clarity in your speakers for cars.easy Installation - Standard 15-inch size and terminal compatibility make this woofer speaker quick to mount in most car enclosures. Technical Specification:Speaker Type: WooferRMS: 250WPeak Power: 500WVoice Coil Size: 62MM (2.5"""")Voice Coil Material: ASVVoice Coil Impedance: 4 OhmsVoice Coil Layers: 2Magnet Size: 60 OzFrequency range: 35-2kHzCone material: PolypropyleneThe Small ParameterBl - 13.78Fs - 32.61Re - 4Sd - 8.71E-02Cms - 0.0978Mms - 243.55Qes - 1.0519Qms - 2.2518Qts - 0.717Vas - 103.57Sensitivity - 87.4Package Information:1x Woofer