Yup. When I first got them I ran them at what I thought was a moderate volume for around 3 hrs. Then I turned the gain up a little more on the amp for about 7 or 8 more hrs. I wasn't satisfied with the sq or the amount of bass when I turned the system up after this break in. At low volumes when I first got them I thought, boy these have good sq. So after thinking that these subs were all hype I decided to adjust the amp. I had the bass boost turned all the way to 0. I turned this bass boost up about half way and couldn't believe it. THe subs were way louder than any of my previous systems, and the output of my previous systems impressed my friends who ran JL, SOny LOL, and Fosgate. I was afraid of turning the stereo up even with my windows up at work because I thought I would set the alarms off to the cars around me. The bass ended up being too much. SO I turned the bass boost down and lowered the gains and adjusted on the crossover some more. THe sq is there the amount of spl that I want is there and great part is my adjustements haven't been maximized yet and I have them in a crappy box right now. I ordered a new box and can't wait for it to arrive. Oh and when I thought I was running the subs at a moderate volume when breaking them in, I really wasn't. The volume level I was playing them at wasn't even working them. It was like nothing.