Vifa coaxials will add true high fidelity to your car audio. All feature the legendary Vifa silk dome tweeters, strontium magnets and composite diaphragms. Available in 2 or 4-way configuration. Vifa 6 x 9inch 4-Way Car Speakers with Silk Dome Tweeter Cat No. CS-2397, Power handling: 150WRMS, Nominal impedance: 4 ohms, Frequency response: 35Hz - 20kHz, Sensitivity: 90 dB SPL @1W, Re: 3.6 ohms, Qms: 8.84, Qes: 0.56, Qts: 0.53, Vas: 35 litres, Fs: 42.7Hz, Dimensions: A =235 x 160 B=171 x 120 C=220 x 150 D=103