a 400 watt 2 channel amp should do fine. all you need to do is bridge the sub when it is being hooked up
Any amp will power a 15" sub. What you need to know is what is the RMS of the 15" sub. Lets say its 200 watts RMS than you will want a max of 200 watts for your amp.
Yup :)
Depends if you are building heavy bass system with quite a few subs then a mono amp would be suggested but if it is just a single sub just for a standard bass upgrade then a 2 channel amp would be fine you can still use a mono amp on one sub just remember to take into perspective the RMS rating and the Impedance on both the Subs and the Amp
depends on what the rms is. The 1000 is there for looks, the rms is what you really want to look for.
Cant you need a amp or you will blow the battery
this will all depend on what sub and what amp you want. along with how good of job you want done. you can do it your self if you purchese the sub, amp, wireing kit, and buying a sub bow or makeing one your self. it you want to be under a seet or blend in with your truck you need to eather buy a special box or make one that fits.
What you want to look for is the RMS of the amp and the sub. . . im going to guess that the 660 is the peak watts of the amp and the 1000 is the peak of the sub so in that case the amp would push it but not like is can be pushed. . . with 1000 watts your sub's rms is around 600 i would guess so you need an amp around 600 rms and you want to get and amp that has 2 channels so you can bridge the amp and get more power to your sub you can try that with the 660 watt amp you have and you should hear a big difference. . .
you just need one, a general rule of thumb is that the wattage on your amp should be double the wattegae on your sub, hence if you have a 1200 watt sub you'll need a 2400 watt amp
A 100-A sub-panel would be fed from a 100-A breaker.
That depends on the power ratings of the subs.
I would use 4 AWG copper to be safe.