CD AMP Problem

[jonnya]

Hi,

Could anyone tell me if the output to all the speakers from the amp (mounted in the boot(standard equiptment 180w)) is the same. I want to put new 6.5 inch speakers all round and wondered if it was possible. The reason I think it might not be is the speakers in the rear pillar(estate) are 4 inches in diameter.(speakers in front are 6.5 inch standard)

Also is there any good material i can pack behind the speakers in the front doors to make the sound from the speaker not be absorbed into the door?

My car is an 03 406 1.9 s diesel estate.

Your help will be much appreciated.

Thanks,

Jon