Certainly, you can also use 2 mono amps to power left and right stereo channels. One for each channel. Using one mono amp for stereo results in a mono output though.
A mono amp will not sound good with door speakers. There are to be used with subwoofers
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You can find that answer at Crutchfields.com under support
This depends on your amplifier's specifications. i would recommend looking in the amplifier's service manual to avoid disapointment or damage to your amplifier or speakers.
Yup
That would make a total of 20 speakers. Sony sells no such system, nor do they sell an amplifier that can connect that many speakers.
a channel refers to the speakers or subs. for example a 2 channel amp can power 2 subs or speakers. a 4 channel will power 4.
The TV will need to have AUDIO OUTPUT jacks to connect to the speakers or a amplifier to power the speakers and subwoofer.
no you dont There are a couple of options. you can buy a 2 chanel with 400W rms per chanel, or a mono at 800w. make sure you match the ohms of you speakers with you amp. If your amp is 800w rms at 2ohm, it's 400w rms at 4 ohms. So if your speakers are 4 ohms, they wouldn't be getting the power they need. And remember you can blow speakers by under powering them, but not by over powering them.
If you connect three 4 ohm speakers in parallel, the amplifier would see a load of about 1.3 ohms. This definitely could damage the amp if you drive it too loud.
The Audiobahn A2200HCT 2-Channel Car Amplifier is a good choice.