I have heard the amplified ones and was not impressed at all. I have a 12" sub in sealed box now powered by large amp, and was just curious how the 10" passive bazooka might sound? I like the cleaner/ tighter sound of a 10" over the 12"...and have heard the bazooka's in enclosed vehicles, but not in a jeep with top down. I have read in various posts where people complained about not being able to hear the ones that have amp built in going down the road..but I would have to think hitting a passive one with plenty of power should still hammer hard ? Thoughts ?