Ive a Sony Xplod CD Receiver-WX-GT77UI and im yet to decide which speakers i should go for. I prefer d brands jbl, kenwood, pioneer and Rockford Fosgate. I dnt hav a parcel tray in d rear and d cars a hatchback, means short of boot space. So, i intend to install d speakers in d 4 doors. d size is 6 inch round. Also, ive heard dt only 1 set of frnt speakers is better dn 2 sets. is dt ryt?