You can get really good sound quality or really loud. You have to give on one to get more of the other. 170 is not going to be achievable in a system that can play music. High 150's are possible as Loyd proved but to get beyond that you have to pretty much go for broke on the SPL front and dedicate the system to that purpose at the cost of anything resembling SQ. High 150's are more than loud enough for any sane person and most diehard bass fiends that listen to music in their cars wouldn't really know 150 if it smacked them in the head. Again, that kind of volume is not tolerable to a person sitting in the car. Anyone who says different does not know what they are talking about.hehe thats what i figured, but i did not mean good SQ at 170 db's i meant a system with great SQ at normal SPL lvls, but with the ability to hit 170