Jbl Gto629 Premium 6.5-Inch Co-Axial Speaker - Set Of 2 JBL GTO Series high-fidelity speakers are the ideal upgrade for any auto or audio enthusiast who?s looking to transform the driving experience. Easy to install and built to last, this innovative line of speakers is engineered for the difficult environments and conditions both in and outside today?s automobiles. Because they?re available in the most common factory sizes, audiophiles who are upgrading or replacing their speakers can be assured that the GTO Series has a fit for every need. Carbon-injected Plus One cones are larger than others in their size class, meaning they move more air and make more bass. Dimensions: Mounting Cutout Diameter: 5-1/16 inches. Mounting Depth: 2 inches. External Diameter: 6-1/4 inches Patented UniPivot tweeter allows you to aim the sound at your ears, even when the speakers are mounted down low in the doors for a much more lifelike sound A dual-level tweeter volume adjustment helps compensate for less-than-perfect speaker placement, and can even be set to suit your personal listening preference and musical taste Low-impedance, three-ohm speakers compensate for the undersized wires found in many of today?s cars, and make the most of every watt your car stereo can deliver Dedicated 12dB/octave, high-quality crossover components direct the highs and lows to the appropriate speakers for the best sound possible