This is the current set-up in my car
1) 'Panasonic' DF-600 Head
2) Front in-dash 'Kicker' 4-inch Component speakers Stillwater Design
3) Rear free-air 'Alpine' 175A 6-inch Component Speakers
4) 'Alpine' F-400 4-channel Amp.(linked to 4 Front & rear speakers)
5) 'Power Acoustic' Pre-Amp...