SoundXtreme 6x9" 4-Way speaker set (2 speakers) 140 watt RMS with 520-watt peak power for the pair Aluminum voice Coil: 1", ohm impedance: 4 ohm, sensitivity: 92dB/1W/1m Woofer size: 6x9 in. (160x230 mm), frequency Response: 30 - 20, 000 Hz, Injection cone woofer Mounting hole diameter: 5-5/8 x 8-7/16 In. (143x215 mm) Music is a great companion when you’re on the road, but most cars on the lot come equipped with low-quality factory speakers that don’t do your favorite tunes justice. If you're a real audiophile, it might be worth swapping out your car's speakers for ones of a higher caliber. And the good news is that you don't have to spend a fortune to do it, either. But before you begin your hunt for a new audio system for your automobile, there are a few things to consider. First should be budget. How much do you want to spend? Other important factors are sound quality, speaker size (do you want a 6x9 speaker, a 6.5-inch speaker or something with a killer bass?), as well as design. To help you make the right decision, we only choose the highest quality speaker such as SoundXtreme SX for you to buy. Technical Details: Speaker Design: 4-Way Woofer Size: 6x9 in. (160x230 mm) Mid Size: 2 in. (50 mm) Tweeter Size: 1/2 in. (13 mm) DC Resistance: 4 ohms Peak Power: 260 Watts per speaker / 520 Watts per pair Sensitivity: 92 dB @ 1W, 1m Effective Frequency Range: 30Hz - 20kHz Mounting Hole Diameter: 5-5/8 x 8-7/16 in. (143x215 mm) Top Mount Depth: 7/16 in. (12 mm) Bottom Mount Depth: 3 3/16 in. (81 mm) Tweeter Protrusion 1/16 in.(1 mm) Grilles: Yes Tweeter Magnet Material: Electric Crystal Motor Tweeter Dome Material: PEI (polyether imide) Tweeter Design: Balanced dome Woofer Cone Material: Polypropylene Woofer Surround Material: Polyester foam