well I couldn't get them to sound good at all. I built a a couple boxes for them and never could get the sound I desire from them. Don't get me wrong they were very loud but there's more to it than that in my opinion. As far as the build quality goes the suspension seemed weak and the glue joints were poorly done. I also had a problem with one of them and it had a short life for whatever reason. The other one is still going strong in my friends altima. I should probably clarify that I'm not claiming dc is junk I just think they have went downhill steadily compared to a couple years ago. They are not alone AQ and DD are heading down the same path