Please suggest me on my system

andyhe
andyhe Posts: 1
edited November 2006 in Car Audio & Electronics
I'm new face in the field. please send me some suggestion on my system.
1 AV unit: Pioneer AVH-P6800DVD (built in 22W / 50W) x4
4Ohm
2 Front speakers: Polk DB6750 (100W / 300W) 4Ohm
3 Rear speakers: Polk Db650 (60W / 180W) 4Ohm
I have not use any AMP now. and connect speakers to AV unit (Pioneer 6800) directly. Is it OK and safe?

If I upgrade my system with AMP and Subwoofer (like DB804DVC). Is it possiable to use only one 200W AMP drive DB804DVC. others speakers still drived by AV unit(Pioneer AVH-P6800DVD).

To save the space, I prefer to buy one AMP for whole system. Please suggest me the AMP model and brand for DB6750 + DB650 + DB804DVC + Pioneer AVH-P6800DVD. How about use KENWOOD KAC-X650D (4Ohm: 60Wx4+200Wx1/14.4V/Rating) for above all things?