This bundle contains a pair of MB Quart FKB169 6x9" coaxial speakers, and a pair of MB Quart FKB113 5.25" coaxial speakers. MB Quart Formula 6 x 9 inch 2-way coaxial car speakers with aluminum dome tweeters and Butyl rubber surrounds The ideal balance of a high end car audio system requires the perfect mix of speaker tone, deep bass impact and clean undistorted power. With MB Quart we make it simple to develop the impeccable Formula for a great sounding system. The Formula line offers a high end sound quality though a full line of aluminum dome tweeters with polypropylene cone speakers. These components can be matched with 400 watt peak power, dual 4 ohm subwoofers to command the deep bass frequencies all powered by the Q-Stasis circuitry amplifiers in the Formula line up. RMS Power Handling 75 Watts Peak Power Handling 150 Watts Speaker Impedance 4 Ohms Frequency Response 46Hz - 20kHz Sensitivity 88dB Crossover Point 1kHz + 3k Crossover Slope 12dB Mounting Diameter / Cut Out 8.64 x 5.98 Outside Diameter 10.35 x 7.20 Mounting Depth / Chassis Depth 3.35 MB Quart Formula 5.25 inch 2-way coaxial car speakers with aluminum dome tweeters and Butyl rubber surrounds. RMS Power Handling 45 Watts Peak Power Handling 90 Watts Speaker Impedance 4 Ohms Frequency Response 60Hz - 20kHz Sensitivity 88dB Crossover Point 4kHz Crossover Slope 12dB Mounting Diameter / Cut Out 4.48 Outside Diameter 6.26 Mounting Depth / Chassis Depth 2