I do have them in my vehicle. I have two 6.5" Sony Xplods mounted directly to the metal door frame (bad idea, I know) and two 6x9's in the rear deck, and even though the back speakers are a little louder, both sets produce clear sound at all ranges. I get good bass with these speakers, which is what I like. Most of the more expensive speakers did not have the level of bass that these Xplods do. The HOP woofer cone and the PEI Dome tweeter and PEI Dome supertweeter provide clear sound throughout all the ranges, and I get the same bass as a small 8" subwoofer would produce. All that without an amp...I'm running the 52W peak 17W RMS x 4 channels straight from the CDX GT200 head unit's built-in amplifier to get that kind of sound. The 6.5" speakers are rated for 220W peak or 55W RMS and the 6x9's are rated for 240W peak or 80W RMS. On some of the more intense songs, I can actually feel the bass coming off the HOP woofer cones, and its enough for me to actually see the bass pulses in the interior mirror. It is kinda hard to describe the level of sound quality I am getting with these Sony Xplods, but they seem to me as if they are worth a lot more than what Sony asks for them. The high-end sounds come out clear, too. I am able to hear the soft metallic song of a cymbol being tapped by a drumstick. At times, it feels and sounds like I've got a full setup in my car because of the amount of bass and the sharpness and quality of the music that these Sony Xplod speakers and head unit produce.