I don't have the mach system. I don't even have rear speakers in the car. I would rather not take the rear seat out because I would prefer to be able to get it in and out. I still have the spare tire in the car so access to it would be nice. I have a set of golf clubs that take up the front section of the trunk but other than that I do not use it. I listen to all types of music, anything from metal to rap to some techno. I am using a Memphis 1000D to power the driver but changing the amp is another consideration. Just not too sure what I would get to replace it.