I used to have a full in-phase system, they sound really good for the price and you can drive them hard, they're subs arent as strong, but have a good kick. I've just started my new install which I bought from caraudiocentre, its a full alpine speaker system with in-phase amps so I'm waiting to see how it sounds. Just dont buy autoleads stuff, I fitted my head unit tonight with autoleads spacers and they didnt even fit in the gaps! Do they just not test their products or what? It's ridiculous!