Loudest i've heard was at a car show down in memphis last summer with my cousin and he saw one of his co-workers that he used to work with from like 3 yrs back and back then my cousin had that loudest system and this dude used to have the old solo-barics but now he has 2 18" solo-x no wall just had them laying down facing up in a explorer sport powerd by 2 orion 2400d the old kind for DD and had 4 (one on each coil) for comps he had the the back seats taken out so it was a 2 seater so he lets me get in the passenger seat puts on some lil whyte song and when the first bass drop hit i thought i pissed on my self literly man i was in heaven and this is with volume half up and only 2 orions on a new tl he was hitting like a 156-157 pretty good for no wal and all his windows were flexing so much it was sick