I run the Hex series in both of my vehicles (with TDX sub to boot). Absolutely love'em. I have not auditioned Focal or MB Quart in a vehicle yet, but I once ran a set of JL VR series 6.5 coaxials that sounded VERY smooth.

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ECLIPSE H/U - ZAPCO DIGITAL SERIES AMPS - DIAMOND AUDIO HEX/TDX SPEAKERS/SUB