[Haibane]

The speakers are 6.5s. Sony Reciever won't do much for you. Alpine is good stuff. Kicker will work for most. Get a new headunit. Pioneer, Eclipse, or Alpine. Some of their newer stuff. New subs? What type amps are your alpine amps? 1,2,4 channel? how much power? What are you looking to spend on new subwoofers?