Re: Installing an amp
1. YOu could power both components and subs off of one amp but its not reccomended at all. To power your component (front and rear) speakers you should use a 4 channel amp, one channel for each speaker. For one sub you either need a mono amp or a 2 channel (bridged).
2. the guage of wire you need depends on the power draw of the amp and how much it outputs. I would say if its under 500 watts 8guage would do but I would personally do as I said above and run 4 guage from the battery to your trunk and then split off to 8 guage, there is very little price difference but 4 guage is hard to get into the holes on some amps.
3. are you talking about mounting your amp in the front of the car?? I wouldnt. Put your amps wherever your subs are unless you are doing some crazy custom thing, I generally mount the amps on the sub box. Generally its not neccesary to use auxilary cooling for the amps, they are designed to be housed in a closed area (trunk) and designed to disspiate heat.
If you got a big *** 4 channel amp you could power your two components and two 10's MAYBEE of course depending on the amp and depending on the subs. You would have to have a way to turn down the gain quite a bit on the 2 channels that would connect to your components and it would have to have enough RMS per channel to power each of the 10's connected independently to the 2 remaining channels. You would also require some external crossovers to cut the highs out of the signals going to the subs, and possibly the lows going to the components.
Personally I never suggest connecting components and subs so the same amp because it is botlenecking your system because you cant tweak the amp as well because you have to accomodate two completely different kinds of speakers. If you only want to power 2 component speakers I would buy a smaller 2 channel amp for those and buy a bigger 4 channel and bridge the 4 channels down to 2 channels for your two 10" speakers or 12" speakers. (or get a bigger 2 channel that provides enough RMS per channel for each sub) if you got a 4 channel You would have to ge a 4 channel that when bridged would provide the RMS power that your subs require.
This could go over your head, if so let me know and i will explain further, or ask any more questions you have. If possible give some speaker models that you have and thier power requirements.
I got the green glow under my car...I got the boom boom system you can hear real far. -Hot Action Cop