I just replaced the deck in one of my cars. It can do 45W x 4. It only currently has 2 front speakers and nothing else. I want to add two rear speakers and then later add an amp and woofer box. As the car is a little older, I absolutely don't want to spend a bunch of money on this upgrade. My question is this... Would it be wise for me to use the deck to power the 4 main speakers (2 front and 2 rear) and use the amp (a cheaper mono amp) solely to power the woofer? Will I have to be careful not to get too powerful an amp for this woofer and if I did, would the woofer overpower and drown out the other speakers or would my bass adjustment be enough to reduce the woofer in comparison to the other speakers? Ideally I would like to simply run the 4 speakers off my existing deck and save on the amp.